Effects of Aerially Applied Gypchek on Gypsy Moth (Lepidoptera: Lymantriidae) Populations in Maryland Woodlots

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Abstract
Moderate to high density gypsy moth, Lymantria dispar L., populations in eastern and northern Maryland were aerially treated with the nucleopolyhedrosis virus product, Gypchek. A tank mix containing Orzan LS (6% wt/vol) as a sunlight protectant, Pro Mo liquid supplement (12.5% by vol) as a feeding stimulant and humectant, and Rhoplex B60A (2% by vol) as a sticker was applied twice to nine woodlots at the rate of 18.7 liters and 1.25 × 1012 polyhedral inclusion bodies per ha per application. Compared with numbers in control woodlots, this rate reduced numbers of egg masses by 98% in eastern Maryland, and by 80% in northern Maryland. Differences in defoliation between sprayed and control woodlots in either area were not significant.

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