Abstract
An extensive outbreak of the Virginia pine sawfly, Neodiprion pratti pratti (Dyar), began in 1957 in Virginia, and by 1959 more than 2 million acres of pine forest had some degree of defoliation. Climatic factors, diseases. and predatory insects did not significantly reduce the larval sawfly population, but predaceous enemies of cocooned prepupae destroyed an average of 54.6%. Sixteen species of primary and hyperparasites were reared during the 3-year period of the study. Approximately 56% of the prepupae in cocoons remaining after predation were destroyed by insect parasites. Exenterus Canadensis Provancher, Mastrus sp., Villa sinuosa Wiedemann, and Endasys subclavatus (Say) accounted for 91% of the total parasitization. A brief biology of each of the more important species is given. Even though 80.2% of all sawfly larvae attaining the cocoon stage was destroyed by predaceous enemies and insect parasites, the rapid decline in the sawfly infestation during 1961 and 1962 is attributed to loss of vigor by the adults.
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