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Tent Caterpillars and Their Effects on the Forests in Canada The tent caterpillars population has been slowly increasing over the last 5-10 years. The sudden changes in the weather in Canada, making it a warmer place to live is the result of the infestation of tent caterpillars. Some people have resorted to using pesticides to eliminate the caterpillars such as diazinon, malathion or sevin. Spraying doesn't control the overall population of caterpillars, but it does reduce their numbers and makes them less of a nuisance to humans in certain areas. But pesticides are not the answer. They can harm animals and other insects in the process, therefore causing the food chain to go off balance. Pesticides may even cause the extinction of other animals in the process of trying to reduce the population of just one species. The easiest and most logical way to reduce the infestation of Tent caterpillars are by destroying their nests or by inviting nearby birds to come feed on them by placing bird baths and feeders around your property. Forest tent caterpillar egg masses are laid in summer on twigs of the trees and shrubs, and stay throughout the winter. Since each egg mass contains up to s