Abstract
The distributions of oak leafroller ( Archips semiferanus ) egg masses, deposited in 1972 and 1973 by females in different population densities, were examined on red oak species in central Pennsylvania. As egg mass density increased, the percentage of egg masses on the boles of trees increased from 50–72. From 67–80% of the egg masses were found on limbs and bole sections in the middle half of host trees. On boles females discriminated in oviposition by laying more egg masses in the southern quadrant, and at middle heights rather than at either extreme. The aggregation of egg masses on boles varied with population density, and regression models provided expected distributions of numbers and densities of egg masses on boles as well as describing distributions on limbs and within crowns.
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