Yeheb (Cordeauxiaedulis) extract deters feeding and oviposition of Plutella xylostella and attracts its natural enemy
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The effects of yeheb (Cordeauxiaedulis Hemsl.) leaf extract on feeding and oviposition by diamondback moth (DBM) (Plutella xylostella L.) and the behavior of DBM parasitoid, Cotesia vestalis (Haliday), were studied. Volatile organic compounds (VOCs) from the headspace of intact and DBM-damaged broccoli plants sprayed with yeheb extracts (YE) were also analyzed. Larval feeding and growth, and oviposition by adult DBM were strongly inhibited by the extract. Cotesia vestalis were attracted to volatile blends from intact or DBM-damaged broccoli plants sprayed with YE over intact plants sprayed with water or methanol. Analyses of VOCs in the headspace of broccoli plants revealed that both intact and DBM-damaged plants sprayed with YE showed remarkable differences in sesquiterpene compounds compared to intact control treatments. These combined negative effects of YE on DBM fitness together with positive effects on the parasitoid show that yeheb is a potential source of compounds for use in integrated pest management to control damage caused by DBM.
KeywordsYeheb extract Cordeauxia edulis Herbivorous insects Cotesia vestalis Plutella xylostella Natural enemy
This study was supported by the Academy of Finland (grant number 116981). We thank Jaana Rissanen and Timo Oksanen for their technical assistance. Dr. James Blande is acknowledged for language revision. We also thank the anonymous reviewers for their constructive comments.
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