Abstract
The reduction in agricultural production due to the negative impact of insects and weeds, as well as the health and economic burden associated with vector-borne diseases, has promoted the wide use of chemicals that control these “enemies.” However, the use of these synthetic chemicals has been recognized to elicit negative impacts on the environment as well as the health and wellbeing of man. In this study, we presented an overview of recent updates on the environmental and health impacts of synthetic pesticides against agro-pest and disease vectors while exhaustive reviewing the potentials of natural plant products from Zanthoxylum species (Rutaceae) as sustainable alternatives. This study is expected to spur further research on exploiting these plants and their chemicals as safe and effective pesticide entities to minimize the impact of their chemical and synthetic counterparts on health and the environment.
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Introduction
The growing trends in urbanization and industrialization in the past few years, with a corresponding ever-growing population, have greatly affected the ecosystem. This global population increase has cast tremendous pressure on existing agricultural practices. Most countries aim to increase food production to meet their growing population demands, predicted to reach nearly 10 billion by 2050 (Yadav et al. 2020). Different agrochemicals, such as pesticides to combat pests and diseases, have recently been very popular. However, it is necessary to ascertain any adopted agricultural practice’s sustainability and its tantamount effects on human health and the environment. With the increased crop production, natural products must be developed and utilized as sustainable alternatives to synthetic herbicides, insecticides, and other pesticides (Anaduaka et al. 2023).
Synthetic insecticides and herbicides fall under the general class of chemical pesticides. While insecticide specifically kills disease vectors or insects that infest cultivated plants, herbicide kills weeds and unwanted plants competing with cultivated crops for nutrients, sunlight, and water. Insecticides and herbicides can be specific to human enemies or exhibit a broad-spectrum nature, annihilating harmful and beneficial insects and shrub plants (Smith et al. 2021) (Fig. 3). The mode of action differs from one insecticide or herbicide to another. Some insecticides are classified as stomach poison—which elicits their actions upon ingestion by the insect. In contrast, others are contact poisons or fumigants. Contact poisons elicit their action when in contact with the external surface of insects, while fumigants kill insects when inhaled (Campos et al. 2019).
Similarly, most weeds have narrow leaves, which exhibit a wide range of contrasting biochemical properties to their broadleaf counterparts, which are most-time our cultivated shrubs or plants. These biochemical differences form the basis for many herbicides’ selective killing of weeds (Wang et al. 2018). The Weed Science Society of America (WSSA) summarized the biochemical mode of action (MOAs) of generally known herbicides in their publication on http://www.wssa.net/Weeds/Resistance/WSSA-Mechanism-of-Action.pdf. Many known herbicides work with the inhibition of one of the following enzymes or biochemical pathways; acetyl CoA carboxylase (ACCase), acetolactate synthase (ALS), photosystem I and II, fatty acid and lipid biosynthesis, enolpyruvyl shikimate-3-phosphate synthase (EPSPS), glutamine synthetase, carotenoid biosynthesis, protoporphyrinogen oxidase, and mitosis and meiosis (Westwood et al. 2018). Hence, farmers must adopt a suitable herbicide based on their MOAs that best selectively kills weeds without harming the valuable plants. The toxicity of synthetic pesticides and their metabolite on the ecosystem and human health have raised serious global concerns (Wojciechowska et al. 2016).
Alternative pest and weed management methods are the physical and biological methods (Baker et al. 2020). The physical method refers to using physical means to kill or deter pests, insects, rodents, and weeds from adversely affecting humans and their activities. Traps, predators, fires, temperature control, and barriers are the standard physical pest control methods (Vincent et al. 2009). Physical methods generally have minimal adverse health effects, although many results in serious environmental concerns. For instance, burning weeds fosters global warming, and killing birds and rodents may distort ecological balance and favor species extinction (Gerhards and Schappert 2020).
A viable alternative is the adoption of biological controls, which implies using living organisms to control human enemies. Specifically, introducing a predator, parasite, or causative disease agent to a pest may eliminate or distort the viability of that pest without compromising human health and the environment (Stenberg et al. 2021). Recent studies have discovered that plants such as the Zanthoxylum species exudate non-human toxic and environmentally-friendly metabolites, potent toxicants to insect pests and weeds (Hikal et al. 2017). This review presents an overview of the health and environmental implications of chemical pesticides while exposing metabolites of Zanthoxylum species as a recommended alternative source of natural insecticides and herbicides.
Methodology
This study comprises two parts—the first part (Sections 3 and 4) provides an overview of the ecological and health impacts/consequences of adopting synthetic and chemical pesticides to control agricultural pests and disease vectors. The second part (Section 5) presented an exhaustive review of studies adopting or discovering different natural products or metabolites from Zanthoxylum species as pesticides (insecticides, fungicides, and herbicides). This study adopted the classical or traditional review pattern for literature search, using the following keywords—herbicide, insecticides, non-target species, birds, amphibians, fishes, soil ecosystem, agroecosystem, aquatic ecosystem, atmosphere, air, acute toxicity, chronic toxicity, ocular, nasal, dermal, and oral route. Using Boolean connectors such as “AND” or “OR” where necessary, studies specific to the different subsections were retrieved, emphasizing recent studies (2015 – 2022).
In the second section on Zanthoxylum’s metabolites, this study adopted the systematic review pattern for retrieving relevant studies. Works of literature reviewed in this section were retrieved from PubMed, Scopus, and ScienceDirect. Moreover, we searched Google Scholar as a secondary source, using essential keywords and Boolean connectors. After synthesizing the retrieved documents from the primary databases, only 81 non-redundant documents were obtained. The systematic search performed on those primary databases adopted keywords such as (Zanthoxylum) AND [(herbicide) OR (fungicide) OR (insecticide) OR (pesticides)] in their title, abstract, and keywords. We excluded all non-Zanthoxylum literature, works of literature on Zanthoxylum as antibiotics, non-English language literature, and literature not specific to pesticide or vector-killing activities. Moreover, our inclusion criteria comprise all studies on products majorly from Zanthoxylum, such as extracts, characterized compounds, and grounded plant parts, showing pesticide activities. After applying our exclusion and inclusion criteria, 29 studies were reviewed in the second part of this paper.
Ecotoxicological impacts of synthetic pesticides
Synthetic pesticides have been reported to impact the environment negatively, affecting the food web and ecosystems in diverse ways. This section discussed the ecotoxicological and health impact of adopting these synthetic pesticides in agriculture pests and disease vector control.
Impact on non-target species
Despite the ever-growing need and beneficial roles of pesticides, their adverse effect on non-target organisms has been a global concern for decades. Predators act as a biological control measure in controlling the population of pests that are essentially their prey, making them beneficial to the environment. A growing body of evidence from available literature documents the adverse effects of pesticides on the predator population. A plot treated with chlorpyrifos caused a significant reduction in the population of spiders, richness, evenness, and species diversity of collembola relative to the control in a study conducted on grassland in the UK (Fountain et al. 2007; Sánchez-Bayo 2021). Furthermore, foliar application of systemic pesticides of neonicotinoids family such as clothianidin, imidacloprid, admire, acetamiprid, and thiamethoxam resulted in a highly toxic effect on natural enemies when compared to fipronil, buprofezin, and spirotetramat (Kumar et al. 2012; Zhang et al. 2016). Similarly, the spraying of imidacloprid and cypermethrin on the brinjal (also known as nightshades) ecosystem resulted in increased mortality of braconids, predator spiders, and coccinellids when compared to biopesticides and Azadirachta indica (neem) as insecticides (Ghananand T, Prasad CS 2011; Zaller and Brühl 2019).
Furthermore, it has been shown that pesticides can cause a change in predator behavior as well as other developmental parameters such as growth rate, development, and reproductive parameters, for instance, a significant decrease in body size, reduction in morphometric parameters, and hemocyte count in Pterostichus melas italics (carabid beetle) (Giglio et al. 2011; Benítez et al. 2018). Similarly, glyphosate-based herbicides caused a change in behavior and survival rate of ground beetles and spiders as well as the effect on the arthropod community, thereby influencing ecosystem biological control (Evans et al. 2010; Schmidt-Jeffris et al. 2022).
Pollinators play vital roles in the agricultural process during pollination. Various species of bees (including Bombus spp. and Apis spp.) and birds and beetles are essential pollinators and serve as bioindicators in the ecosystem. Continuous and indiscriminate use of synthetic insecticides and pesticides could result in low yield/loss of crops by reducing the population of pollinators (Fishel 2014; Ara, 2021). Similarly, other activities of pollinators are disrupted by pesticide (an insecticide) application, ranging from the efficiency of pollen collection, colony mortality, and foraging behavior (Straub et al. 2022).
Neonicotinoid-based insecticides (such as dinotefuran, thiamethoxam, thiacloprid, and clothianidin) caused lethal and sub-lethal effects on learning, foraging behavior, and memory of the bees (Blacquière et al. 2012; Buszewski et al. 2019). Furthermore, exposure of honey bees to a non-lethal dose of thiamethoxam resulted in substantial mortality due to homing failure, thus putting the colony in danger of collapse (Henry et al. 2012; Giri et al. 2018). Case of high mortality, poor efficiency in pollen collection, and colony collapse as a result of exposure of worker bees to pyrethroid and neonicotinoid insecticides has also been reported (Gill et al. 2012; Wood and Goulson 2017). Several recent review articles report other studies on the effects of pesticides on pollinators (Sponsler et al. 2019; Serrão et al. 2022; Straub et al. 2022). In conclusion, synthetic pesticides harm functional and ecologically beneficial non-target species such as pollinators, biological recalcitrant waste degraders, and bees.
Impact on the soil ecosystem
The continuous use of pesticides in agriculture results in high retention and accumulation of considerable fractions in the soil. The fate of these pesticides is determined by microflora and the properties of the soil, where they undergo various processes such as transport, degradation, adsorption, and desorption (Rasool et al. 2022; Okeke et al. 2022a). After degradation, there is excellent interaction between the pesticides and the soil environment and soil microorganisms, leading to alteration in enzymatic activities, biochemical reactions, and microbial activities (Ahmed and Al-Mutairi 2022; Okeke et al. 2022b). Adversely, certain microbes utilize applied pesticides as an energy source to support their population growth and concomitant soil ecosystem disturbance (Fig. 1). Specifically, chlorpyrifos was found to act as a carbon source, increasing the growth of a bacterial isolate from agricultural soil irrigated with wastewater (Farhan et al. 2021). Several biochemical reactions in the soil, such as ammonification, nitrification, and nitrogen fixation, are adversely affected by herbicides and insecticides via the deactivation/activation of specific soil enzymes and impacting the efficiency and population of soil microorganisms. Whether soil biochemical reaction will be increased or decreased is a function of the synergistic interaction between microorganisms, pesticides, and soil properties (Alengebawy et al. 2021). Within a pesticide concentration of 2.5 kg/ha–5.0 kg/ha, the population of Azospirillum spp. was found to be significantly increased, as well as its ammonification rate in vertisol and laterite soils on which Arachis hypogaea L. was planted but showed reverse effect at higher concentrations (Srinivasulu et al. 2012).
The rhizosphere microbial community improves soil quality by participating in nutrient and biogeochemical cycles, improving crop yield (Li et al. 2022a). A recent study shows that glyphosate caused a perturbation in the rhizosphere microbial community (Newman et al. 2016; Lu et al. 2017). More so, pesticide applications have also been reported to kill or inhibit some microorganisms and outnumber another group, thereby affecting competition among them. Notably, endosulfan application resulted in a 76% increase in bacterial biomass and a 47% reduction in fungal biomass (Xie et al. 2011; Arora and Sahni 2016). Mineralization of soil organic matter has also been reported to be significantly affected by pesticide application. This crucial soil property influences productivity and soil quality. For instance, soil organic matter was significantly reduced, followed by applying four different herbicides (prime extra, atrazine, glyphosate, and paraquat) (Sebiomo et al. 2011; Athiappan et al. 2022).
Synthetic pesticides have been reported to adversely affect microbial biomass growth, metabolic activities, and colonization (Mandl et al. 2018; Zaller et al. 2018). Also, their negative impacts on valuable soil enzymes, essential in agriculture, decomposition of organic matter, and nutrient cycling cannot be overemphasized (Pattanayak et al. 2022). Other recent findings on the effects of synthetic pesticides on soil and agroecosystems are summarized in recent reviews (Galhardi et al. 2021; Mehdizadeh et al. 2021). We conclude that synthetic pesticides affect the soil and agroecosystems by distorting regular nutrient cycling, soil biomass, mineralization, and agro-productivity.
Impact on aquatic and air ecosystems
There is uncontrollable downward movement or leaching of pesticides from agricultural fields into water bodies where non-target species, including fishes and other aquatic organisms, are affected, thereby causing a threat to biodiversity and an imbalance in ecosystem equilibrium (Ahmad Dar 2016) (Fig. 2). Pesticides can find their way into the aquatic environment through various routes such as industrial effluent, accidental spillage, washing of spray equipment after spraying, surface runoff, and movement from pesticides-treated agricultural fields (Dhawan et al. 2017). The bioaccumulation of pesticides in the tissues and organs of aquatic organisms has also been reported (Yadav et al., 2018). The continuous deposition of pesticides in the aquatic environment has erupted enormous public health concerns. They pose a significant risk to the aquatic ecosystem and consequent long-term effects on humans throughout the food chain (Kumar et al. 2021).
Similar to the aquatic environment, pesticides in the air can arise through volatilization from applied agricultural fields or surfaces, aerial application, and spray drift. Wind speed and droplet size are key factors determining the drift’s extent. In contrast, the volatilization rate is determined by ambient temperature, wind speed, humidity, the vapor pressure of the pesticide constituents, the surfaces where the pesticides settle, and the time after pesticide treatment (Kaur and Garg 2014). The volatile nature of pesticides poses a significant risk to the atmosphere, making them prone to pollution (Rajmohan et al. 2020). In a study conducted in Washington and California in the United States, organophosphorus pesticides were detected from environmental samples from surfaces and air after spraying agricultural fields (Armstrong et al. 2013; Sharma et al. 2019; Okeke et al. 2022d).
Amphibians are found in various terrestrial, arboreal, and aquatic ecosystems. There are increasing global environmental concerns over the declining population of amphibians worldwide; while most are almost to extinction, a considerable number are already endangered species (Ockleford et al. 2018). Although numerous problems are responsible for such population drop, herbicides and insecticides are significant contributors. Climate change and global warming have caused temperatures to become warmer, thereby increasing the impact of pesticides on the population of amphibians (Johnson et al. 2013; Prasad and Prasad 2022). Other factors include the permeable nature of the skin, the rudimentary immune system, and the terrestrial-aquatic cycle of amphibians (Varga et al. 2018).
Birds are not spared from the hazardous effects of pesticides; they are exposed to these toxic chemicals through ingestion of treated seeds, the spray, treated crops, contaminated water, and contaminated baits (Richard et al. 2021). Certain insecticides, such as organophosphates and carbamates, have been shown to cause bird mortality (Jayaraj et al., 2016). Ground-nesting birds, such as grassland birds in America, were reduced in population due to pesticide toxicity (Mineau and Whiteside, 2013; Gunstone et al. 2021). Various insecticides (such as carbofuran, cholinesterase inhibitors-fenthion, phorate, and carbofuran) and herbicides applied to rice fields have been reported to be highly toxic to birds causing a wide range of mortality and reproductive toxicity (Mladenović et al. 2018) Mladenović, Milan 2018.
The synergistic interaction of fish with the chemical, biological, and physical environment makes them a vital component of the aquatic ecosystem. They are an essential part of the marine food web as they are a food source for other ecosystem members like marine mammals and sea birds. Pesticides have generally been reported to affect fish populations in the aquatic ecosystem, as they have been reported to contribute to the mortality of fish globally. The presence of pesticides in the aquatic environment, even at low concentrations, could still pose a harmful effect on marine organisms (Mladenović et al. 2018). The ability of fishes to bioaccumulate toxic chemicals makes them susceptible to pesticides. Alterations in the biochemical parameters of aquatic organisms could serve as a bioindicator for evaluating the health of aquatic organisms (Poopal et al. 2017). A recent study reported a change in biochemical and histological parameters of Cirrhinus mrigala (freshwater fish) after exposure to certain pesticides (Ghayyur et al. 2021). Exposure to pesticides caused severe damage to various fish organs such as the alimentary canal, brain, liver, and gill, suggesting that such concentration of pesticide could cause harm to consumers (Nwani et al. 2021). Another independent study shows that organophosphate pesticides could cause an alteration to vitellogenesis in catfish, thereby hindering catfish farming (Shahjahan et al. 2017). Other toxic effects of pesticides on fishes are the distortion of their olfactory senses, which aids them in locating food, avoiding predators, and mating. Some of these effects and many more are summary in a few recent reviews (Kasumyan 2019). We conclude by asserting from abovementioned studies that synthetic pesticides to greater extent detrimentally affect the aquatic ecosystem and a lesser extent the air ecosystem.
Impacts of synthetic pesticides on human health
Regardless of the ease of eliminating weeds and insects with herbicides and insecticides, there are countless reports on their adverse effects on human health (Nicolopoulou-Stamati et al. 2016). The predisposing factors that determine the severity of the harmful effects caused by exposure to these toxicants are the nature of the chemical toxicant, length of time of exposure, the quantity taken by the cells, age of the individual, immune status, and presence of underlying ailment or other comorbidities (Alengebawy et al. 2021). These chemicals, on exposure, gain entry through the skin (dermal contact), inhalation into the lungs, orally ingested from the mouth, or making contact with the eyes. In the human or animal body, these herbicides or insecticides could be metabolized, excreted, or bioaccumulated in the body’s adipose (Thapa et al. 2021).
The health implications of insecticides and herbicides range from acute to chronic conditions depending on the severity of the impact (Hassaan and El Nemr 2020) (see Tables 1 and 2). Acute health conditions are short-term and are experienced immediately after a single exposure, whereas chronic conditions are long-term and occur many months and years after exposure. Acute effects or symptoms are immediately felt or experienced on these organs through their entry point. Acute effects include rashes, blisters, coughing, nausea, dizziness, diarrhea, stinging eyes, and even death from extreme toxicity or extended exposure to acute toxicants (Nicolopoulou-Stamati et al. 2016). Chronic conditions are primarily due to the accumulation of toxicants that may seem harmless in the body’s cells over a long period. Chronic conditions are debilitating and range from cancers, tumors, infertility, and reproductive problems to damage to the liver, kidneys, lungs, and other body organs. Summarily, synthetic chemical herbicides and pesticides may cause dermatological, gastrointestinal, cognitive impairment and neurodegeneration, carcinogenic, respiratory, reproductive, and hormonal/endocrine imbalances (Hu et al. 2015; Sarailoo et al. 2022). The health impact of synthetic insecticides and herbicides varies among the different types and classes of the pesticide. The U.S. Environmental Protection Agency (EPA) has classified pesticides based on their toxicity into four categories (I-IV): oral LD50, inhalation LC50, dermal LD50, time-span eye effects, and time-span skin effects. Category I pesticides are regarded as the most toxic pesticide, while category IV is the least toxic (EPA 2014).
Apart from the exposure to toxic chemicals from herbicides and insecticides as a result of man’s occupational, accidental, or intentional activities, many individuals still come in constant with residues from everyday foods and beverages (Kumar et al. 2020). These chemical residues are recalcitrant and are difficult to wash off from agro-produces thoroughly. Hence, they are consumed as long as their concentration may be lower than the legislatively determined safe concentration. However, certain toxicity levels can still be experienced due to the synergistic effects of several minute residues that may be ascertained to be safe (or have a lower concentration than the legislatively acceptable dose) (Yigit and Velioglu 2020). Although synthetic insecticides and herbicides are classified into several groups based on their mode of action and the class of their active chemicals, their impact on health may vary among synthetic pesticides in the same class.
Sustainable alternative to toxic synthetic pesticides—natural metabolites from Zanthoxylum species
Malaria, leishmaniasis, and other diseases whose causative organisms are transmitted by vectors are increasingly causing significant problems for humans, leading to many sicknesses and death (Eder et al. 2018). Moreover, agricultural activities for food production are threatened by disease-carrying pests and destructive insect pests (Chanda et al. 2017). This situation is aggravated by the growing resistance of these vectors to available insecticides and synthetic pesticides, making the vectors thrive and promoting the spreading of disease-causing organisms (Wilson et al., 2020). These synthetic chemicals also constitute acute and chronic toxicity to humans because of their poor selectivity. Moreover, their persistent nature fosters their accumulation in the environment, causing significant harm to living organisms in soil and water bodies (Nwani et al. 2013, 2021). Hence, the need for a more sustainable alternative for disease prevention, vector control, and agricultural purposes, with adverse effects on human health, our environment, and the ecosystem.
In recent years, research efforts have been directed into seeking and applying secondary metabolites or natural products from plants, microbes, or animals for sustainable management of human disease vectors and agricultural pests (Okeke et al. 2021; Ezeorba et al. 2022; Okagu et al. 2022; Enechi et al. 2022). These natural products are usually environmentally friendly and non-toxic to humans and effectively repel or kill these harmful pests. We shall review recent findings on interesting metabolites from Zanthoxylum species as a potential source of sustainable natural pesticides.
The Zanthoxylum genus is an exciting member of the Rutaceae family containing over 250 species of deciduous and evergreen trees, shrubs, and climbers, which are native to the subtropical regions of the world. Members of the Zanthoxylum species have reported interesting metabolites and volatile organic chemicals with tremendous pesticide activities. Although some studies have reported these phytochemicals of agricultural and pest-control interest to be present in polar fractions (ethanoic, methanolic, and aqueous fractions) of different Zanthoxylum plant parts (fruits, leaves, and bark), the majority of studies have identified these phytochemicals in the fractions of the essential oil obtained either by hydro or steam distillation. In more detail, we shall discuss some of these Zanthoxylum metabolites based on their application as (a) animals and human disease vector control, (b) plant foliage insect pest control, (c) stored grain pest control, (d) phytogenic fungi control, and (e) weed control.
Zanthoxylum species for animals and human disease vector control
Vectors are carriers of disease pathogens for transmission to the host, majorly humans and animals (Wilson et al. 2017). Several studies have identified some Zanthoxylum species’ plant extracts, fractions, and metabolites with insecticidal, larvicidal, pupicidal, or repellency of animal and human disease vectors. Common examples of these vectors (Table 3) are Aedes aegypti and Aedes albopictus (mosquito variants that are a carrier of yellow fever, zika fever, dengue fever, and chikungunya viruses), Culex pipiens pallens (mosquito variants and carrier of bancroftian filariasis and West Nile virus), Anopheles gambiae (carrier of Plasmodium falciparum), and Stomoxys calcitrans (stable flies, vector of many blood-borne zoonotic diseases) (Wilson et al. 2020; Chala and Hamde 2021).
A recent study by Soonwera et al. (2022) identified limonene as the major component of the essential oil of Zanthoxylum limonella dried fruits having larvicidal and pupicidal activities against Aedes aegypti and Aedes albopictus with an LC50 range of 2.5–3.7 % and LT50 range of 0.1–0.3 h). An earlier study from the same lab reported that the essential oil fraction of the Z. limonella dried fruits was potent against Aedes aegypti and Culex quinquefasciatus, expressing adulticidal, larvicidal, pupicidal, and oviposition deterrence activities (Soonwera and Phasomkusolsil 2017). In detail, well-developed adult insects expressed lethality (LC50 of 5.7–6%) after 24 h of exposure to 10% oil in ethanol. In contrast, a 100% mortality of larva and pupae was reported after the same time. Finally, it was discovered that the EO of Z. limonella caused a negative oviposition index (ranging from –0.89 to −1.00) in both insect vectors, implying a deterrence in their egg-producing activities and reproduction (Soonwera and Phasomkusolsil 2017).
Zanthoxylum piperitum is another exciting source of insecticidal and vector-controlling metabolites extensively explored in recent studies. Different studies have isolated valuable metabolites from the plant's barks, fruits, and seeds (Kamsuk et al. 2007a; Hieu et al. 2012a; Kim and Ahn 2017). Important and bioactive lignans and alkaloids extracted from the bark of Z. piperitum were reported with insecticidal and larvicidal activities against the wild Culex pipiens pallens and Aedes aegypti (Kim and Ahn 2017). The spectrometric analysis identified (–)-asarinin, sesamin, and (+)-xanthophyll-γ,γ-dimethylallylether (XDA) as the major lignins, while pellitorine was the most abundant alkaloid in the fraction. Purified XDA gave a reasonable LC50 of 0.27 and 0.24 mg/l against C. pipiens pallens and Ae. Aegypti, respectively, although lower than synthetic temephos (LD50 of 0.006 and 0.009 mg/l, respectively) (Kim and Ahn 2017). Older studies on the same plants (as summarized in Table 3) have reported the potencies of the essential oils extracted from their fruits and seeds as insect fumigant and repellent against the zoonotic vectors (Stomoxys calcitrans and Mansonia uniformis) and numerous insect vectors of human diseases (Kamsuk et al. 2007a; Hieu et al. 2012a).
In another study, essential oils from Z. acanthopodium aerial parts were shown to be cytotoxic to malaria vectors, A. anthropophagus and A. Sinensis, with LC50 and LC90 values of 36.00 and 101.49 mg/L and 49.02 and 125.18 mg/L, respectively, supporting its traditional use in killing insects in China and some other Asian countries (He et al. 2018). The authors further showed that estragole, eucalyptol, β-caryophyllene, cis-linalool oxide, and cis-limonene oxide were the major constituents of the essential oils, with estragole and eucalyptol suggested to be responsible for the cytotoxicity of the essential oils against the two vectors. Estragole was cytotoxic against An. Anthropophagus and An. Sinensis with LC50 and LC90 values of 38.56 and 95.90 mg/L and 41.67 and 107.89 mg/L against An. Anthropophagus and An. Sinensis, respectively. Similarly, eucalyptol was cytotoxic with LC50 and LC90 values of 42.41 and 114.45 mg/L and 45.49 and 124.95 mg/L against An. Anthropophagus and An. Sinensis, respectively.
Essential oil from Z. bungeanum fruits was shown to have repellant effects against the malaria vector (the malaria parasite-carrying insect), Aedes aegypti, supporting the traditional use of the plant in Thailand and other countries (Chaithong U, Kamsuk K, ChoochoteW, Jitpakdi A, Tippawangkosol P, Tuetun B, Champakaew D 2006). In addition, the repellency of the essential oil was compared with a synthetic repellant, N, N-diethyl-3-methyl benzamide, against selected mosquitoes; A. Gardner, A. barbirostris, Armigeres subalbatus, C. tritaeniorhynchus, C. gelidus, C. vishnui group, and Mansonia uniformis. The essential oil was shown to effectively repel all the insects (100% repellency) compared to the synthetic repellant, which repelled only 99.7% of the insects in the field; however, the synthetic insecticide had slightly higher repellant action in the laboratory (Kamsuk et al. 2007b). Further investigation into the mechanism of this repellency and the specific contents of the essential oil responsible for the activity is recommended. In another study, essential oil from Z. armatum seeds gave good cytotoxic activity when exposed to the larva of Aedes aegypti, Culex quinquefasciatus, and Anopheles stephensi with LC50 values of 49, 54, and 58 ppm, respectively, supporting the traditional use of the plant in vector control for malaria prevention in India (Tiwary et al. 2007). Further study on the insecticidal activities of Z. armatum showed that extracts of the stem bark strongly repelled A. gambiae (Mikolo et al. 2009), showing that the plant has promising applications in controlling Anopheles species and preventing malaria as well as minimizing the environmental concerns associated with synthetic insecticides that are used as vector control strategies.
Additionally, Samita et al. (Samita et al. 2013) prepared different solvent extracts of the stem bark of Z. pyracantha, a medicinal plant used in killing mosquitoes in Kenya, and tested their activities against the larva of A. gambiae. The extracts elicited larvicidal activities, with dichloromethane extract being the most active. Bioactivity-directed fractionation of the dichloromethane extract yielded zanthoxoaporphines A, B, C, and sesamin. These isolates also gave potent larva-killing activities with sesamin and zanthoxoaporphine A, showing excellent larvicidal potentials with LC50 values of 10.3 and 11.1 μg/ml after 72 h exposure. Similarly, Hieu et al. (Hieu et al. 2012b) evaluated the potential application of two Z. species, viz. Z. bungeanum, and Z. armatum, as natural insecticides. Solvent extracts and essential oils from the species and their secondary metabolites (cumin aldehyde, thymol, (1S)-(-)-verbenone, (-)-myrtenal, carvacrol, (S)-(Z)-verbenol, and cuminyl alcohol from Z. bungeanum, and piperitone, (-)-(Z)-myrtanol and citronellal from Z. armatum) demonstrated moderate toxicity against Stomoxys calcitrans (with LC50 values of 0.075–0.456 μg/ml). However, the insecticidal activities of the plants and their compounds were lower than those of two synthetic organophosphorus insecticides, chlorpyrifos, and dichlorvos. Some of the isolated compounds, citronellyl acetate, α-pinene, thymol, carvacrol, and α-terpineol, inhibited acetylcholinesterase activities in the insect. However, the acetylcholinesterase-inhibitory effect was not directly linked with the insecticidal activities.
The activities of Z. heitzii against many types of insects have been reported (Mikolo et al. 2009; Overgaard et al. 2014a), supporting the traditional application of the root bark decoctions in controlling vectors of many human diseases. Secondary metabolites isolated from Z. heitzii stem bark (dihydronitidine, caryophyllene oxide, pellitorine, and sesamin) showed insecticidal activities against the adult and larvae stages of A. gambiae. Specifically, pellitorine inhibited both stages (with LD50 values of 50 ng/mg and 13 μg/ml against insects and larvae, respectively), while caryophyllene oxide and sesamin inhibited only the larval stage with LD50 > 150 μg/ml. When combined, these compounds were also synergistic, exhibiting higher toxicity to both insect stages than their individual effects when used alone (Moussavi et al. 2015). This report has positioned phytochemicals from Z. heitzii stem bark, especially pellitorine, as natural insecticides that can target both adult and larvae stages of A. gambiae. It is worth mentioning that the above study has some limitations in not using standard insecticides to compare the activity of the herbal compounds. To strengthen the study’s designs, researchers working on biological activities of bioactive compounds, whether synthetic or natural products, are hereby recommended to ensure they include a group treated with standard drugs to make room for comparison of the efficacy of the test compound(s) with a reference standard(s).
Future studies should delve into the search for more potent metabolites from other Zanthoxylum species as well as other plants. Moreover, further characterization of these metabolites and their nanoformulations for their controlled release and delivery may improve their bioactivities (Okeke et al. 2022c).
Zanthoxylum species and its metabolites for agricultural field insect pest control
Agricultural and food crop production is greatly affected by the infestation of field insect pests, which results in their overall decrease in viability and productivity. These insects are parasitic, feeding, and taking shelter from different parts of the plants for their survival, regardless of the detrimental harm they inflict on the plants. Metabolites of several Zanthoxylum species have been reported to play vital roles in controlling the field of insect pests to boost agricultural productivity and maintain the integrity of our environment and ecosystem (Table 4).
Zanthoxylum rhoifolium has been reported as a rich source of valuable metabolites for deterring and killing field pests. A recent study has shown that the free essential oil of Z. rhoifolium fruits, which contained majorly β-phellandrene (76.8%), β-myrcene (9.6%), and germacrene D (8.3%), had insecticidal activities (64.8 % mortality) against a bean plant pathogen (Bemisia tabaci) in 1.5% EO suspension (Pereira et al. 2022). Moreover, the nanoformulation of its essential oils to generate a homogenous nanosphere by nano-precipitation improved the insecticidal activities to about 84.3% mortality, 71% reduction in insect oviposition, and greater than 64% mortality of second instar nymphs (Pereira et al. 2022). Finally, nanoformulation improves the EO’s insecticidal activities, and the study showed improved photostability and stability in adverse conditions (Pereira et al. 2022). A previous study on the same plant, Z. rhoifolium (although with the extract of leaves and branches), has shown its great insecticidal activities against workers of Atta sexdens L. (cutting ants) (Gomes et al. 2016). The cutting ant is a well-known destructive plant pest that attacks the leaves and other aerial parts of several plants at different stages of growth (Mota Filho et al. 2021).
Zanthoxylum armatum is another species studied for its insecticidal activities against agricultural field pests. It was recently reported by (Kaleeswaran et al. 2018) that the n-hexane, methanol, ethyl acetate, and aqueous extract of Z. armatum fruit pericarp and leaves, though contact and oral toxicity, fostered the mortality of oriental leaf worms (Spodoptera litura), with an LC50 range of 0.179–5.97%. This insect pest majorly attacks and destroys the leaves of tobacco and cotton plants (Kaleeswaran et al. 2018). The insecticidal activities of the n-hexane fraction (LC50—0.179) were slightly better than a synthetic pesticide—azadirachtin, with LC50 of 0.239 %, although both with comparable lethal time (LT50—60 h). Moreover, the plant extracts also showed interesting antifeedant and ovicidal modes of action to curtail the spread of the field pests (Kaleeswaran et al. 2018). Another study adopted the use of spectrometry techniques to identify compounds present in the n-hexane extracts of Z. armatum leaves and discovered majorly two fatty acids - 2-undecanone (19.75%) and 2-tridecanone (11.76%), with impressive potencies against another field pest—diamondback moth (Plutella xylostella). In addition to the insecticidal activities, the extract also showed larvicidal activities with an LC50 of 2988.6–16750.6 ppm (Kumar et al. 2015). Finally, the essential oil of Z. armatum fruits was earlier reported to be potent against the field pest—Aphis cracccivora, when in contact with the pest for about 48 h, and LC50 between 55 and 60 ppm (Tewary et al. 2005)
Tringali et al. (2001) isolated sesamin, 1-hydroxy-3-methoxy-N-methylacridone, arborinine, xanthoxoline, 1-hydroxy-3-methoxyacridone, oblongine, tembetarine, magnoflorine, and hesperidin from ethanol extract of Z. Clava-herculis barks and examined their insecticidal activities against the larva of Spodoptera littoralis and S. frugiperda. It was reported that among these compounds, xanthoxoline showed the highest antifeedant activity by suppressing feeding patterns in S. littoralis and S. frugiperda larvae by 53% and 58%, respectively. This report positions xanthoxoline as a potential entity that demands further investigation as a larva-stage insecticide for S. frugiperda and S. littoralis. Other Zanthoxylum species with extracts or metabolites against field insect pests have been summarized in Table 4.
Zanthoxylum species and their metabolites for the control of pests of agricultural stored products
To ensure an all-year-round supply of food crops and other agro products, there is a need to improve agro-storage systems to ensure that the viability and quality of agro-produce are maintained. Some insect pests specifically attack stored products fostering their spoilage (Kumar and Kalita 2017). Zanthoxylum metabolites in many studies have proven to be a sustainable alternative to synthetic pesticide to wage against insect pests of stored products. Moreover, these metabolites are non-toxic to humans even when consumed alongside stored food crops (Ke et al. 2019).
The dried stem bark and roots of Zanthoxylum zanthoxyloides were processed into fine powder to prevent infestation of Callosobruchus maculatus, a well-known insect pest that attacks Bambara nut, cowpea, and lentils. Ugwu et al. (2022) reported that 10 g of fine powder of Z. zanthoxyloide dried stem bark per 100 g of Bambara-nut caused about 80.67% mortality of Callosobruchus maculatus after about 120 h contact time. More so, an observable deterrence in oviposition and adult emergence was also reported as part of the mechanism of action of Z. zanthoxyloide against the pests (Ugwu et al. 2022). An earlier study obtained a similar result, which prepared and adapted the root powder of Z. zanthoxyloide to prevent the same insect pest—C. maculatus. Significant antifeedant activities were observed at a concentration of 5% (wt/wt) of the powder, and a 100% mortality was recorded after 3 days (Odeyemi et al. 2013).
Essential oils of Zanthoxylum monophyllum fresh fruits prepared by hydrodistillation have been reported in two studies to be potent against Tribolium castaneum (Red flour beetle) and Sitophilus oryzae (Prieto et al. 2011; Oviedo-Sarmiento et al. 2021). In the most recent study, Oviedo-Sarmiento et al. (2021), using GC-MS analysis, identified α-pinene (6.7%), β-pinene (35.3%), β-ocimeno (7.9%), and linalool (10.8%) from the essential oil fraction. The essential oil showed significant insecticidal and fumigant toxicity against the Red flour beetle, with an LC50 of 18.5 μL/L air. Moreover, the mechanism of insecticidal activities of the essential oil fraction owes to the fostering >50% inhibition of acetylcholinesterase (AChE), glutathione S-transferase (GST), and catalase (CAT) in the insect pest (Oviedo-Sarmiento et al. 2021). Contrarily, Prieto et al. (2011) previously reported the abundance of sabinene (25.71%), 1,8-cineole (9.19%), and cis-4-thujanol (9.19%) in the essential oil fractions of the same plant. Their studies showed the insecticidal and fumigant activities of the essential oil against Sitophilus oryzae (insect pests of stored rice products) with an EC50—222 μL L-1 air. Many factors may have contributed to the difference in phytochemical contents between the two studies, such as differences in analytical protocol, different plant growth conditions, and other salient processing (Prieto et al. 2011). In another study, the botanical fine powdered prepared by pulverizing dried fruits of Zanthoxylum armatum Roxb has also shown insecticidal activities against Sitophilus oryzae L (Rice weevils), causing about 70.67% inhibition at a concentration of 10 g/kg (Khanal et al. 2021).
Stored products destructive insects (Tribolium castaneum) have recently been deterred and killed by essential oil fraction of Zanthoxylum limonella seed and Zanthoxylum planispinum var. dintanensis leaves and fruit pericarps. Wanna and Satongrod (2020) reported that the essential oil fraction of Z. limonella seeds contained multiple phytochemicals with more abundance of (19.65%), 9-octadecanone (18.80%), and D-limonene (9.76%). About 10% concentration of the essential oil results in a 100% mortality of the insects’ eggs, larvae, and adults within 14 days,48 h, and 120 h, respectively. Conversely, the essential oil of Z. planispinum fruits and leaves had an abundance of oxygenated monoterpenes (linalool, sylvestrene, and terpinen-4-ol) from the fruits and 2-dodecanone from the leave extract. It was reported that purified 2-dodecanone showed interesting insecticidal activities against T. castaneum adults (LD50 = 2.54–23.41 μg/adults) after 2–4 hr contact post-exposure (Wang et al. 2019). Several other Zanthoxylum species have been processed for their metabolites against pests of stored agro-products, as summarized in Table 5.
Zanthoxylum species and their metabolites for controlling phytopathogenic fungi
Several disease-causing fungi and bacteria tremendously affect agriculture crops and animal production, leading to the loss of their quality and quantity and even death. Synthetic fungicides and bactericides have been popularized due to their mode of quick response to salvage an agro-business (Fausto et al. 2019). However, their impact on human and the environment is enormous and should not be overlooked. The use of natural products such as phyto-bio fungicides is still considered a more sustainable alternative (Zubrod et al. 2019). Recent studies have reported the application of some metabolites and volatile organic chemicals from Zanthoxylum as potent against phytopathogenic fungi and even bacteria (Table 6). Li et al. (2022b) recently reported the isolation of a plant’s volatile organic chemicals (Linalool) from the fruit pericarp of Zanthoxylum schinifolium. This PVOC caused membrane disruption to Aspergillus flavus (a post-harvest spoilage organism) when applied as a biofumigant with a MIC and MFC of 0.571 μL/mL and 0.857 μL/mL, respectively (Li et al. 2022b).
Fusarium graminearum is a devastating fungi-pathogen of cereals and one of the causative agents for the Fusarium head blight disease of wheat. The organism also produces mycotoxin – deoxynivalenol, which fosters the progression of the disease in plants (Abbas and Yli-Mattila 2022). Recently, the flavonoid-rich methanolic extract of Zanthoxylum bungeanum fruit pericarp (containing quercetin, epicatechin, kaempferol-3-O-rhamnoside, and hyperoside majorly) could help combat the progression and spread of Fusarium head blight disease caused by Fusarium graminearum (Abbas and Yli-Mattila 2022). The extract (100 μg/mL) caused a decrease in F. graminearum growth by 48.5%, its DNA level by 85.5%, and its mycotoxin production by 73.0% in an in vitro bioassay (Abbas and Yli-Mattila 2022). Similarly, according to Prieto et al. (2011), the essential oil of Z. rhoifolium fruits, with β-myrcene (59.03%), β-phellandrene (21.47%), and germacrene D (9.28%) as major components, was effective as a fumigant against Fusarium oxysporum at an EC50 of 140.1 μL L-1 air.
Another study has reported the potential of the essential oil and methanolic extracts of Zanthoxylum alatum leaves as a fungicidal and bactericidal agent (Guleria et al. 2013). It was shown that several fungi (such as Alternaria alternata, Alternaria brassicae, and Curvularia lunata), as well as a few bacteria (Bacillus subtilis, Micrococcus luteus, Staphylococcus aureus, and Escherichia coli), were significantly inhibited or killed by the extracts with the major components of linalool (30.58%), 2-decanone (20.85%), β-fenchol (9.43%), 2-tridecanone (8.86%), β-phellandrene (5.99%), sabinene (4.82%), and α-pinene (4.11%) (Guleria et al. 2013). It is worth mentioning that several other studies have discovered the antibacterial and antifungal potential of some other natural products from Zanthoxylum, although not specific to plant pathogens, but rather as an alternative to antibiotics (Okagu et al. 2021a, b). Therefore, the need for future studies to put in a more concerted effort toward the discoveries, application, and scale-up of novel natural products from Zanthoxylum and other plants as alternatives to synthetic pesticides.
Zanthoxylum species as a potential source of natural herbicides
The possible application of Z. bungeanum fruits as herbicides has been evaluated. Volatile compounds, especially eucarvone from the plant’s fruits, moderately inhibited the hypocotyl growth of lettuce seedlings (Sunohara et al. 2014). Similarly, extracts of Z. bungeanum leaves have been shown to suppress the germination and viability of Medicago sativa, Lactuca sativa, and Raphanus sativa by up to 80% (Li et al. 2009). Furthermore, xanthoxyline isolated from Z. limonella fruits was reported to drastically suppress the germination of Amaranthus tricolor and Echinochloa crusgalli (Charoenying et al. 2010). In addition, extracts of Z. schinifolium leaves and stems were reported to significantly halt the germination and seedling of Triticum sativum (Wu et al. 2012).
To further exploit Z. species as a source of herbicidal compounds, Rios et al. (Rios et al. 2018) prepared different solvent extracts of Z. fagara that showed varied herbicidal activities against Lactuca sativa and Lolium perenne. Additionally, linarin, lupenone, tocopherol, and affineine were isolated from the most active extract. Only linarin showed a good phytotoxic effect by inhibiting energy production and respiration. These reports demonstrate that Z. species are potential sources of natural herbicides. Hence, further studies are recommended on screening other species and testing their chemical constituents against many known weeds. The herbicidal potentials of Z. species are summarized in Table 7.
Limitations, future research directions, and conclusion
There is an urgent need to minimize the negative impact of human activities on the environment and prevent the health outcome associated with it. Part of these strategies is to search for alternative chemicals for controlling vectors and insects of agricultural importance, especially from natural products that are less toxic to humans and animals and eco-friendly. Scientists are exploiting the understanding that plants synthesize some chemicals to repel and kill insecticides that cause plant diseases to evaluate the potential applications of extracts of these plants and chemicals isolated from them as a source of natural insecticides and herbicides. In the several studies reviewed, extracts of different parts of Z. species and compounds isolated from them were shown to have promising insecticidal activities to several insect vectors, especially malaria parasite vectors.
Although the insecticidal activities of the plant extracts and chemicals derived from them were lower than the synthetic insecticides, efforts to minimize the environmental and health concerns of using synthetic insecticides underscore the need for further development of these plant secondary metabolites as natural insecticides. Similarly, crude extracts of Z. species and compounds isolated from them were shown to have potential application as natural herbicides by strongly inhibiting the growth and development of several weeds. Despite these exciting reports, the mechanisms of insecticidal and herbicidal activities recorded by some of the Z. species and their chemical constituents need to be investigated. This will position them as potential sources of natural insecticides and herbicides.
In addition, some studies failed to compare the insecticidal and herbicidal activities of Z. species-derived entities with synthetic insecticides and herbicides. Future research should be designed to compare the potency of natural compounds under evaluation for insecticidal and herbicidal activities and known insecticides and herbicides to provide a sound basis for making an informed decision on the benefits of plant-based insecticides/herbicides over their synthetic counterparts. Moreover, the advent of nanotechnology development has opened new avenues for the development of control release and precise targeting of these bioactive components to the insect and pests for better efficient results. In conclusion, there is a need for the transition from bench-to-market (i.e., real-life application) of research finding about natural products to lessen the impact of synthetic pesticide toxicities and promote healthier alternatives.
Data availability
All data generated or analyzed during this study are included in this published article.
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Okagu, I.U., Okeke, E.S., Ezeorba, W.C.F. et al. Overhauling the ecotoxicological impact of synthetic pesticides using plants’ natural products: a focus on Zanthoxylum metabolites. Environ Sci Pollut Res 30, 67997–68021 (2023). https://doi.org/10.1007/s11356-023-27258-w
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DOI: https://doi.org/10.1007/s11356-023-27258-w