Dispersal Losses of Early-Instar Spruce Budworm (Lepidoptera: Tortricidae) 1 Larvae in Strip Clearcut and Dense Spruce-Fir Forests of Maine 2

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Abstract
Strip clearcutting contributed to dispersal losses of early-instar larvae of the spruce budworm. Choristoneura fumiferana (Clemens) (Lepidoptera: Tortricidae). Significantly more L 1 larvae were trapped in uncut residual strips of strip clearcuts than in dense stands. Significantly more L 2 larvae were trapped in cut strips than in residual strips or in dense stands. Consistently more L 2 larvae were caught than L 1 larvae. Mean percentages of L 1 + L 2 larvae trapped represented small fractions (1.4−4.0%) of initial egg populations. Proportionately more larvae were trapped in strip clearcuts (uncut residuals + Cut strips) than in dense stands. Estimated combined losses (L 1 + L 2 ) were 1.4 million larvae per ha for dense stands and 2.9 million larvae per ha for strip clearcuts.