Distribution and Repopulation of Terrestrial Insects in Sprayed Areas1

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Abstract
Six study plots were selected to provide a variety of habitat conditions within a 132,800-acre block of forest sprayed for spruce budworm control. Changes in populations of insects were studied for 2 years following the spray application. Tests for significant differences in relative frequency of orders of insects present before spray showed a nonrandom distribution in the six sample areas. No numerical relationship could be found between the pre- and postspray populations and there was a complete lack of uniformity in the patterns of repopulation between the areas sampled. The family composition of some of the various orders of insects was found to be altered over the period of study. The most significant changes in numbers was found in the Coleoptera. No evidence was obtained to suggest any interaction between like groups in adjacent populations. They behaved differently in each sample area.

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