Insect reactions to light and its applications to pest management
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Insects are able to see ultraviolet (UV) radiation. Nocturnal insects are often attracted to light sources that emit large amounts of UV radiation, and devices that exploit this behavior, such as light traps for forecasting pest outbreaks, and electric insect killers, have been developed. Some diurnal species are attracted to yellow; yellow pan traps are used for conducting surveys for pest outbreaks and yellow sticky plates are used for pest control. Lamps that give off yellow illumination have been used effectively to control the activity of nocturnal moths and thus reduce damage to fruit, vegetables, and flowers. Covering cultivation facilities with film that filters out near-UV radiation reduces the invasion of pests such as whiteflies and thrips into the facilities, thus reducing damage. Reflective material placed on cultivated land can control the approach of flying insects such as aphids. Future development and use of new light sources such as light-emitting diodes is anticipated for promoting integrated pest management.
KeywordsIntegrated pest management Artificial lighting Photoreception Phototaxis Light-emitting diode
It is well known that insects fly toward streetlamps or other outdoor illumination at night. This innate phototactic behavior has provided the basis of the design of electric insect killers. Equipped with UV-emitting fluorescent tubes, the insect killers effectively attract insects such as moths and beetles and prevent these insects from entering into greenhouses and stores that are open at night. In recent years, considerable interest has been generated in pest control technology that utilizes the responses of insects to light as a “clean” form of pest control that does not use synthetic pesticides (Antignus 2000; Ben-Yakir 2013; Emura and Tazawa 2004; Honda 2011; Johansen et al. 2011; Tazawa 2009). Here, we review recent advances of pest control technologies that employ this method.
Influences of light on insect behavior and development
There are a wide range of responses to light beyond phototaxis. (C) Light adaptation is when nocturnal insect species become light-adapted within several minutes of exposure to light (Day 1941; Post and Goldsmith 1965; Walcott 1969) and exhibit typical daytime behaviors such as cessation of movement and settling down (Fig. 2c). Behaviors such as flight and mating are inhibited in nocturnal insects that are exposed to bright light at night. (D) Circadian rhythms are daily behavioral rhythms including flight, locomotion, feeding, courtship, mating, etc. (Fig. 2d) (Bateman 1972; Shimoda and Kiguchi 1995). Artificial lighting for a certain duration during the night can shift the timing of the diurnal/nocturnal behaviors of insects (Okada et al. 1991). This response is called a “phase shift” in chronobiology (Pittendrigh 1993; Truman 1976). (E) Photoperiodicity is the physiological response of insects to the light schedule (i.e., day length). The onset of diapause can be prevented by exposing insects to light repeatedly for several days (Masaki 1984; Saunders 2012). Insects that do not enter dormancy are unable to overwinter (Fig. 2e). (F) Light toxicity occurs when the retinas of compound eyes of an insect exposed to UV and blue light radiation are damaged and structurally degenerated (Meyer-Rochow et al. 2002; Stark et al. 1985). Furthermore, some insects are unable to undergo normal development or survival (Fig. 2f) (Ghanem and Shamma 2007; Siderhurst et al. 2006; Zhang et al. 2011). Such photo-irradiation can also be used for post-harvest treatment of crops. (G) Insects will not actively fly toward something they cannot see (i.e., invisible). That is, by covering a greenhouse with UV-blocking film, plants inside can be made invisible to insects. As a result, pests will not enter the greenhouse (Fig. 2g) (Antignus et al. 1998; Legarrea et al. 2010). (H) Finally, some free-flying insects show a dorsal light reaction, where they stabilize their horizontal orientation (attitude) by perceiving light that shines on their dorsal side as sunlight does during flight (Jander 1963). The ability to control roll by means of the dorsal light reaction is known for many flying insects such as dragonflies and desert locusts (Goodman 1965; Neville 1960). By covering the ground with a highly reflective mulching sheet, the normal orientation of flight is disturbed by light reflected from below (Fig. 2h). These last two effects of light are useful to prevent insects from entering a cultivation area.
These responses to light are substantially influenced by a variety of factors, including light intensity and wavelength, combinations of wavelengths, time of exposure, direction of light source, and the contrast of light source intensity and color to that of ambient light. In addition, the impact of light on insect behavior varies both qualitatively and quantitatively depending on the light source (light bulb or light-emitting diode [LED]) and material (light-reflecting plate) (Antignus 2000; Coombe 1981, 1982; Honda 2011; Johansen et al. 2011; Matteson et al. 1992; Nissinen et al. 2008; Prokopy and Owens 1983; Smith 1976). In the remainder of this review, we discuss examples of technologies that are currently being used to control a variety of pests.
Attraction of insects to light sources at night
Attraction of insects to color plates
Suppression of nocturnal insect activities by yellow light
Control of pest infestation using UV-absorbing films
Inhibition of flight by reflective mulching films
Current research on physical pest control using light
The Ministry of Agriculture, Forestry and Fisheries of Japan has been implementing a research project called “Elucidation of biological mechanisms of photoresponse and development of advanced technologies utilizing light” since 2009 (Honda 2011). Understanding the light-response mechanisms of insects and developing advanced applied technologies are the main objectives of this project and research is underway toward the development of pest control technology using new light sources such as LEDs. The National Agriculture and Food Research Organization (NARO) of Japan is the core research institution for this project and more than 20 research groups including universities, independent administrative institutions, public research institutes, and companies participate. The main areas of research include basic research on reaction behavior, color perception, and polarized light perception with light of different wavelengths; the development of outbreak forecast technology using new light sources; and the development of pest control technology using new light sources. In the project, we have set three research areas.
For the first research area, electrophysiological techniques are being used to comprehensively measure the sensitivity of different pests over a wide range of light wavelengths. In addition, the responses of stinkbugs, thrips, whiteflies, planthoppers, leafhoppers, and other species to LEDs and other light sources are being studied to clarify the relationship between light wavelength and the behavioral ecology of pests. This area of research is aimed at determining the wavelengths that are effective for attracting or repelling pests as well as those that affect behavioral activity and orientation to the light (Hironaka and Hariyama 2009).
The second research area includes the development of LED light sources that can be used in place of incandescent lights to forecast agricultural pest outbreaks as well as the investigation of outdoor devices (light sources and traps) that can be used in places with no electricity. Beneficial insects such as parasitoid wasps that are natural enemies of pests will also be studied to determine the light wavelengths that attract them effectively. Studies are also investigating the development of fundamental technologies for devices to survey and collect natural enemies. Moreover, devices that effectively attract biting midges, which play an important role as vectors for viral diseases in livestock, will be developed to survey outbreaks.
For the third research area, behavioral effects such as attraction or repulsion associated with different wavelengths of light are being analyzed for whiteflies, thrips, and leafminer flies, which damage vegetables grown in greenhouses; lepidopteran pests of bare-earth vegetables and tea; Asian citrus psyllids for citrus fruit; fungus gnats for cultivated mushrooms; and green chafers for sugarcane. New pest control technologies for these pests include the use of LEDs. LED lighting devices that take up little space and have low energy consumption are likely to enable pest control in places where conventional light sources are impractical. At the same time, studies are being carried out to investigate the wavelengths that are effective against pests but have little effect on the cultivation of crops. This research area aims to develop a new pest control technology that is fully compatible with cultivation technology.
LED devices with various wavelengths can now be manufactured due to recent technological advances, and new agricultural technology using light is starting to attract attention. Advances are also expected in the use of light for pest control as a result of these technological developments in lighting. Based on the new research being conducted by NARO, we hope to ensure the further development of applied technology founded on a good balance of input from basic research in universities and independent administrative institutions and applied technology from public research institutes and private companies to establish the next generation of pest control technology.
This work was supported by a grant titled “Elucidation of biological mechanisms of photoresponse and development of advanced technologies utilizing light” from the Ministry of Agriculture, Forestry and Fisheries (MAFF), Japan and JSPS KAKENHI Grant Number 25660268.
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