Parasitoids in low-level populations ofLymantria dispar [Lep.: Lymantriidae] in different forest physiographic zones |
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| Authors: | Margaret Skinner B L Parker W E Wallner T M Odell Diantha Howard J Aleong |
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| Institution: | (1) Department of Plant and Soil Science, The University of Vermont, 05405 Burlington, Vermont, USA;(2) Present address: Center for Biological Control of Northeastern Forest Insects and Diseases, Northeastern Forest Experiment Station, 06514 Hamden, Connecticut, U.S.A.;(3) Present address: Statistical and Computer Services, Department of Mathematics and Statistics, The University of Vermont, 05405 Burlington, Vermont, U.S.A. |
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| Abstract: | A 2-year study was conducted on the distribution of parasitoids of gypsy moth,Lymantria dispar (L.) (Lep.: Lymantriidae), in mesic and adjacent higher elevation transition and xeric forest habitats in Vermont (U.S.A.). In both years, overall parasitism ranged from 12–18% in each habitat. When analyzed according to the life stage at which the host was collected, parasitism rates of greater than 40% were obtained among the late instars.Parasetigena silvestris (Robineau-Desvoidy) andPhobocampe disparis (Viereck) were recovered most commonly from the mesic habitat, andCotesia melanoscelus (Ratzeburg) andBlepharipa pratensis (= Sturmia scutellata) (Meigen) were most common in collections from the xeric area. Parasitism byCompsilura concinnata (Meigen) occurred at similar levels in all three habitats, and this species was responsible for the highest parasitism rates on the site, reaching 40% among the late instars in 1985. Percent parasitism byC. concinnata increased three-four-fold from 1984 to 1985, while parasitism by other species declined. |
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| Keywords: | Insecta gypsy moth parasitism low-level host populations Compsilura concinnata |
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