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Electrophysiological and Behavioral Responses of Cabbage Aphid (Brevicoryne brassicae) to Rosemary (Rosmarinus officinalis) Volatiles, a Potential push Plant for Vegetable push-pull Cropping System

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Abstract

The cabbage aphid (Brevicoryne brassicae) is a major pest of kale (Brassica oleraceae var. acephala), an important vegetable that is grown worldwide due to its high nutritional and economic value. Brevicoryne brassicae poses a great challenge to B. oleraceae var. acephala production, causing significant direct and indirect yield losses. Farmers overly rely on synthetic insecticides to manage the pest with limited success owing to its high reproductive behavior and development of resistance. This necessitates a search for sustainable alternatives to mitigate these challenges. This study assessed behavioral responses of B. brassicae to odors from rosemary (Rosmarinus officinalis) and B. oleraceae var. acephala headspace volatiles in a Perspex four-arm olfactometer. We identified and quantified volatiles emitted by each of the two plants and those eliciting antennal response using coupled gas chromatography-mass spectrometry (GC-MS) and GC-electroantennograhic detection(GC-EAD), respectively. Our findings revealed that B. brassicae spent more time in the arms of the olfactometer that contained B. oleraceae var. acephala volatiles compared to the arm that held R. officinalis volatiles. Additionally, B. brassicae spent more time in the olfactometer arms with B. oleracea var. acephala compared to the arms holding B. oleracea var. acephala and R. officinalis enclosed together and clean air. GC-MS analysis revealed diverse and higher quantities of volatile compounds in R. officinalis compared to B. oleraceae var. acephala. GC-EAD analysis showed that antennae of B. brassicae detected Linalool, α-Terpineol, Verbenone, Geraniol, Camphor, and Borneol from the volatiles of R. officinalis, and Sabinene, γ-Terpinene, and β-Caryophyllene from B. oleraceae var. acephala volatiles. Our findings demonstrate the potential of R. officinalis as a repellent plant against B. brassicae and could be utilized as a ‘push’ plant in an intercropping strategy against this pest.

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The data that support the findings of this study are available up on request from the corresponding author.

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Contributions

DMM and TD conceived the idea, BKM, DMM, KSA, and ENK designed the study; BKM collected data; BKM, DMM, and BM analysed data; BKM and DMM led the drafting of the manuscript; TD supervised the work and DMM provided resources. All authors critically reviewed and approved the final version.

Corresponding author

Correspondence to Daniel Munyao Mutyambai.

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Acknowledgements

This research was funded by the Biovision Foundation project “Intensified agroecological based cropping systems to enhance food security, environmental safety, and income of smallholder producers of crucifers and traditional African vegetables in East Africa—AGROVEG” (DPP-020/2022–2024) through the International Centre of Insect Physiology and Ecology (icipe). The authors gratefully acknowledge the icipe core funding provided by the Swedish International Development Cooperation Agency (Sida); the Swiss Agency for Development and Cooperation (SDC); the Australian Centre for International Agricultural Research (ACIAR); the Norwegian Agency for Development Cooperation (Norad); the German Federal Ministry for Economic Cooperation and Development (BMZ); and the Government of the Republic of Kenya. The views expressed herein do not necessarily reflect the official opinion of the donors.

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No Informed consent was required to conduct this study.

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No institutional approval was required to conduct the study.

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The authors declare no competing interests.

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Mutua, B.K., Dubois, T., Akutse, K.S. et al. Electrophysiological and Behavioral Responses of Cabbage Aphid (Brevicoryne brassicae) to Rosemary (Rosmarinus officinalis) Volatiles, a Potential push Plant for Vegetable push-pull Cropping System. J Chem Ecol (2024). https://doi.org/10.1007/s10886-024-01485-y

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  • DOI: https://doi.org/10.1007/s10886-024-01485-y

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