Attractiveness of two host plants to Microplitis pallidipes and their volatile compounds identification
[Aim]To better understand the effect of host plants and Spodoptera exigua on the tendency behavior of Microplitis pallidipes.[Methods]Maize and amaranth were chosen and the behavioral responses of M.pallidipes to normal plants and larva-plant complex were determined with Y-tube olfactometer,and the volatile compounds were analyzed and identified by GC-MS.[Results]The normal maize and amaranth had no attraction effect on M.pallidipes,but larva-maize complex and larva-amaranth complex exhibited significant attractiveness,and larva-maize complex showed stronger activity than larva-amaranth complex.GC-MS indicated that 22 compounds were detected in normal maize leaves with alkanes and aromatic hydrocarbons as the main constitutes,while 31 compounds were identified in the larva-maize complex and mainly alkanes and alcohols.Similarly,there were 16 compounds in normal amaranth and the content of alkane compounds was the highest with 54.75％.The larva-amaranth complex contained 55 compounds,and alkanes,aromatics,alkenes,acids and aldehydes were relatively high.In addition,some compounds were only produced or increased remarkably in larva-plant complex,such as 2-hexenal,(+)-limonene,α-caryophyllene,DMNT,and α-himachalene.[Conclusion]M.pallidipes were prefer the larva-maize complex,and a wider variety of compounds were released by maize and amaranth after feeding by Spodoptera exigua.
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