Abstract
Significant changes in the parasite complex occurred with the decline in population density of the Virginiapine sawfly, Neodiprion pratti pratti (Dyar). Exenterus canadensis Provancher, Agrothereutes loyphyri (Norton), and Dahlbominus fuscipennis (Zetterstedt) increased in importance; Mastrus aciculatus (Provancher) and Endasys subclavatus (Say) decreased in importance; and Lamachus spp. and Villa sinuosa (Wiedemann) remained of about the same importance as during the outbreak period. The value of predatory ants as a biotic factor also greatly decreased in a declining sawfly population. The percentage of cocooned prepupae killed by the fungus Beauvaria bassiana (Balsamo) Vuillemin was influenced by the total rainfall from May through October when the cocooned prepupae were present in the duff on the forest floor.
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