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- W2002181185 abstract "Abstract Larval parasitism of gypsy moth, Lymantria dispar (L.), was monitored in 11 study plots in northern New Jersey from 1978 to 1988. Five parasitoid species were commonly found. Parasitism by Cotesia melanoscelus (Ratzeburg) was highest at the peak of egg mass density during a gypsy moth outbreak. Phobocampe unicincta (Gravenhorst) had low and relatively constant parasitism levels through the outbreak, but parasitism fell near zero after the host population crashed. Parasitism by Compsilura concinnata Meigen peaked during the decline of gypsy moth populations and probably was related primarily to the presence of alternate hosts. Parasetigena silvestris (Robineau-Desvoidy) had the highest levels of parasitism overall. Levels remained high throughout the outbreak and declined with the host populations. Parasitism by Blepharipa pratensis (Meigen) was highest in the first year of the study, when egg mass density was increasing, and declined steadily thereafter, following the trend of host larval density. Parasitism by all species except C. concinnata was correlated significantly and positively with the density of host larvae. Three species showed delayed density dependence. Direct density dependence, density independence, or indeterminate density relationships were observed for all species across study plots within seasons. The relationship of parasitism to ecological factors was investigated through stepwise multiple regression analysis. Parasitism by C. melanoscelus was correlated primarily with winter and spring temperatures and gypsy moth egg mass density. For P. unicincta parasitism, most variation was explained by parasitism by C. melanoscelus and stand density. Parasitism by C. concinnata was correlated most strongly with stand composition and percentage infection by gypsy moth nuclear polyhedrosis virus. Percentage defoliation of oaks explained most variation in parasitism by P. silvestris and B. pratensis." @default.
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- W2002181185 date "1992-03-01" @default.
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- W2002181185 title "Incidence and ecological relationships of parasitism in larval populations of Lymantria dispar (Lepidoptera: Lymantriidae)" @default.
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- W2002181185 doi "https://doi.org/10.1016/1049-9644(92)90073-m" @default.
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