Abstract
The effect of trembling aspen clonal variation on tortricid caterpillar populations, primarily Choristoneura conflictana (Walker) and C. rosaceana Harris, was studied in Michigan and Wisconsin during 1975 and 1976. Ten ramets in each of 4 clones were felled and 100% sampled in 1975. Monte Carlo simulation procedures were used to investigate different sampling intensities. A very acceptable estimate of the mean and variance can be obtained from 1–2 observations per cell (ramet × level). Eight ramets in each of 17 clones were sampled in 1976. A pole pruner was used to obtain 2 branches from each of 3 crown levels for each ramet. There was a very significant (R2=.79, P=<.001 ) linear relationship between the mean proportion of buds infested and the mean flushing date of the clone. Six-fold differences in the mean proportion of buds infested occurred between the early and late flushing clones. Significant differences ( P =<.005) also were found between clones and crown levels. The biology of C. conflictana as it relates to aspen phenology is presented. The importance of using the clone as a sampling unit when studying aspen insects is stressed.
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