Abstract
In Minnesota in 1958 seven of the 16 species of parasites that were pared from the jack-pine bud worm, Choristoneura pinus Free., were not previously reported. Studies of parasites at various locations showed that parasitism by Phaeogenes hariolus (Cress.) and Itopleclis conquisitor (Say) was heavier on edge trees than on trees inside of stands. I. conquisitor parasitism was heaviest a t the bottom of trees a t the edge of stands and heavier on regressive trees (weak dominants and codominants) than on progressive trees (head dominants and strong dominants) inside stands. Glypta fumiferanae (Vier.) parasitism was heavier on trees inside stands than on edge trees and was heavier in the middle and top portion of the edge trees than on the bottom. On small plantation trees G. fumiferanae was more common on staminate-cone-producing trees.
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