Abstract
Regression equations were used to determine an estimate of the number of eggs and 1st-stage larvae of Pikonema alaskensis (Rohwer) on young plantation white spruce trees, Picea glauca (Moench) Voss, for use in life table studies of the defoliator. A linear regression using a square root transformation was developed to predict the total numbers of eggs and 1st-stage larvae on a branch from counts of insects on the distal 15 new shoots at the branch tips. Also a cubic regression equation was developed to predict the number of branches per level by using total tree height. Both regressions were then used together to obtain an estimate of number of insects per tree.
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