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Behavioral pattern of generalist and specialist insect pests to brassicaceous leaf cuticular n-alkanes and free fatty acids

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Abstract

The role of leaf cuticular wax of cabbage, Brassica oleracea L., rapeseed, B. campestris L., and Indian mustard, B. juncea L. in host preference by two generalists, Spilarctia obliqua Walker and Pieris brassicae L., and a specialist, Plutella xylostella L. was investigated under laboratory conditions. A total of 25 n-alkanes from n-C14 to n-C36 and 15 free fatty acids (FFAs) from C12:0 to C22:0 were detected from leaf cuticular wax of three crops with significant variations in their respective quantities (µg leaf−1). The most preferred wax chemicals were consisted of 5 n-alkanes (n-C16, n-C18, n-C20, n-C22, n-C30) and 5 FFAs (C12:0, C16:0, C18:3, C18:2, C18:1) for the pests. Highest attraction index (AI%) and oviposition preference index (OPI%) were in the order of P. brassicae > P. xylostella > S. obliqua and P. xylostella > P. brassicae > S. obliqua, respectively, toward the combined synthetic mixture (5 n-alkanes + 5 FFAs) treated leaf of cabbage due to higher amount of wax chemicals in the specific combination. Both generalist and specialist have same patterns of olfaction and oviposition preferences with different magnitude of responses. Thus, the synthetic blends of same 5 n-alkanes and 5 FFAs of the most preferred cabbage cultivar might be used as lure to develop baited trap as well as less preferred crop (rapeseed and Indian mustard) species might be used as main crop with cabbage as trap crop against the pests for their sustainable ecological management in near future.

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Acknowledgements

I wish to express my deep sense of gratitude to West Bengal Department of Science and Technology (WBDST) Project [File No.: ST/P/S&T/1G-29/2018], from Government of West Bengal, India for financial assistance. I must acknowledge the farmers who help me in every way during my fieldwork.

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West Bengal Department of Science and Technology (WBDST) Project [File No.: ST/P/S&T/1G-29/2018], from Government of West Bengal, India.

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NR designed the whole study including sample collection, chemical analysis, index calculation, data analysis and drafts the manuscript with the help of institutional support.

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Correspondence to Nayan Roy.

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Roy, N. Behavioral pattern of generalist and specialist insect pests to brassicaceous leaf cuticular n-alkanes and free fatty acids. Arthropod-Plant Interactions 16, 537–551 (2022). https://doi.org/10.1007/s11829-022-09917-w

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