Title: Distribution of the cone insect, Dioryctria disclusa, in red pine.

Author: Mattson, William J.

Year: 1976

Publication: Research Paper NC-136. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station

Abstract: Within the crowns of red pine, Pinus resinosa Ait., trees, larvae of the cone insect, Dioryctria disclusa Heinrich, tended to follow the distributions of their foods. Between-tree distributions of larvae, however, were relatable to food distributions in only two of five years. Cone damage/tree by D. disclusa increased linearly with cone abundance per tree when insect populations were large relative to cones. Percentage cone damage/tree was not significantly correlated with cone abundance.