Abstract
ABSTRACT This study evaluates the olfactory response of Chrysoperla externa to the volatiles of the Embrapa 51 genotype of the cashew induced by the herbivory of Aleurodicus cocois, identifies the chemical profile of these compounds and evaluates the development of C. externa fed on A. cocois. The volatiles emitted by the leaves of the cashew genotype, both infested and not infested with A. cocois, were analysed by solid-phase microextraction with GC-MS. In the olfactometry tests, C. externa was attracted to and spent more time in the olfactometer arm containing cashew plant volatiles induced by A. cocois. From the analysis of the volatile profiles, α-phellandrene, α-terpinene, ρ-mentha-2,4(8)-diene, β-caryophyllene and germacrene D were released in large amounts by the Embrapa 51 genotype only after infestation by A. cocois; these compounds may therefore be involved in attracting the predator. Under laboratory conditions, although the development time and survival of some immature stages of C. externa may vary with the type of prey, when fed on A. cocois, the predator is able to complete the egg-adult development cycle. Based on the behavioural and biological assays, C. externa is an effective biocontrol agent for A. cocois in the cashew.
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