Abstract
Studies with caged gravid females of the pickleworm, [Diaphania nitidalis (Stoll.)], revealed that leaves of yellow squash (Curcurbita pepo L.) contain small (MW <1000), non-volatile and highly polar amphoteric compounds which stimulate oviposition on artificial sites. Several compounds, extracted from paper chromatograms, caused moderate stimulation of oviposition. When these extracts were recombined, the mixture proved highly active. Addition of whole leaf volatiles to the active water-soluble fraction increased oviposition. The whole leaf volatiles mixture could be substituted with volatiles originating from leaf glandular trichomes. Index Words. Lepidoptera, Diaphania nitidalis, oviposition, host plant, squash, Curcurbita pepo, trichomes, volatiles.
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