Identification of behaviourally active components from maize volatiles for the stemborer parasitoid cotes/a flavipes cameron (hymenoptera: braconidae)

Publication Type

Journal Article

Journal Name

Insect Science and its Application

Publication Date

12-1-2000

Abstract

In the present study, Y-tube olfactometric assays confirmed that volatiles from maize seedlings infested with Chih partclliis larvae were more attractive to the borer's larval endoparasitoid Cotcsia flavipes, than volatiles from uninfested maize. Coupled gas chromatographyelectroantennographic detector (GC-EAD) analysis of the volatiles from, larvae-infested maize revealed six electrophysiologically active compounds on the antennae of the female parasitoid. These compounds were identified by GC-MS as (Z)-S-hexenyl acetate, linalool, (E)-4,8-dimethyl-l,3,7-nonatriene, heptanal, (E)-β-ocimene and a C-5 aliphatic compound. (£)-4,8-Dimethyl-l, 3, 7-nonatriene was present in EAG-detectable amounts in the volatiles of uninfested seedlings. In bioassays, a blend comprised of (Z)-S-hexenyl acetate, linalool, (E)-4,8-dimethyl-1,3,7-nonatriene, (E)-β-ocimene and heptanal was significantly attractive to the parasitoid. Of the individual compounds, (Z)-3-hexenyl acetate was attractive at the doses tested while (£)-4,8-dimethyl-l, 3, 7-nonatriene and heptanal showed varying degree of attractiveness to the parasitoid at different doses. Linalool and (E)-β-ocimene were unattractive at the same doses. The significance of these results is discussed. ©2000 ICIPE.

Keywords

Braconidae, Cliilo f'nrtcllns, Coicsia flavipes, GC-EAD, Plant volatiles, Pyralidae, Tritrophic system, Zen innys

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