Preference for and Effect of Greenbug 1 Parasitism and Feeding by Aphelinus asychis 23

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Abstract
The ages of greenbugs, Schizaphis graminum (Rondani), preferred for oviposition and feeding by the parasite Aphelinus asychis (Walker), the percent parasite emergence, aphid age class, and the reproductivity of stung and parasitized aphids were determined under laboratory conditions. Statistical analyses of data were made to study the daily reproductive potential of A. asychis . The parasite's preference was young>middle>old for oviposition and young>old>middle aged aphids for feeding. Elapsed time from oviposition to emergence of parasites was usually 11–12 days for all age groups of aphids with males usually the 1st to emerge. Success in parasite oviposition generally decreased as the age of the aphid increased. No aphid progeny was produced if they were parasitized during the 1st 3 days of their lives. Aphids which were parasitized when they became older showed a significant decrease in reproduction. Stung unparasitized aphids reproduced at a rate similar to unstung aphids.

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