Diel Activity of Green Peach Aphid 1 Predators as Indexed by Sticky Traps 2

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Abstract
The diel activity of the predaceous natural enemies of the green peach aphid (GPA), Myzus persicae (Sulzer) (Homoptera: Aphididae) occurring on field potato plants was investigated to quantify time of day effects on sampling. Diel activity was determined by recording from 0900–2030 hours the predator density on 44 sticky traps placed within and on the borders of the field. Coccinellid adults were the most abundant GPA predators collected, and Hippodamia convergens Guerin-Meneville (Coleoptera: Coccinellidae) was the most numerous species caught. Analysis of time of day counts indicated that the 1300–1700 hour sample period contained the largest diel means for H. convergens adults, Coleomegilla maculata (DeGeer) (Coleoptera: Coccinellidae) adults, and Coccinella transversoguttata richardsoni Brown (Coleoptera: Coccinellidae) adults. Chrysopids were common late in the season. Ninety-five % of the chrysopids collected were Chrysopa carnea Stephens (Neuroptera: Chrysopidae). The 2030–0900 hour sample period contained the largest diet means for C. carnea .

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