Site of Spruce Budworm Egg Masses on their Preferred Hosts in the Lake States

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Abstract
The distribution of spruce budworm (Choristoneura fumiferana (Clemens)) egg masses on the tree’s vertical axis and certain needle characteristics at the oviposition site on the branch were examined. The sample trees, which varied in degree of defoliation, consisted of five balsam fir (A bies balsamea (L.) Mill.) and two white spruce (Picea glauca (Moench) Voss). A correlation was established between the number of egg masses and both branch size and location in the crown. The trends of the results were similar for each of the samples. The needle-characteristic study was made only on balsam fir. The side of the needle that faced a high density of adjacent needles was the preferred side for oviposition. The distance between the need les was also a factor responsible in part for selection of the oviposition site.

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