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Winter Moth CaterpillarThe winter moth caterpillar, first introduced to North America from Europe in the early 1930's, has gained widespread attention in recent years. As the caterpillar continues to spread throughout the area, more people are seeking help in controlling this pest.
Adult moths emerge in late November and December, probably the only moths to be seen this time of year. The males are relatively small, light brown, and are attracted to light. The females are gray, wingless and flightless, and can be found crawling on tree trunks and other objects. After mating, the females lay their eggs in bark crevices and other sheltered areas. In mid-late April when temperatures average 55 degrees, the larvae hatch out, and these light green inchworms begin feeding within buds and on expanding foliage. The feeding continues until about mid-June when the larvae pupate in the soil.
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Winter moth caterpillars feed on many deciduous trees and shrubs, including oak, apple, plum, lilac, elm, maple, ash, crabapple, cherry, and blueberry. This causes severe defoliation, which can result in the decline, and eventual death of the plant. Fortunately there is a bio-rational product available that has been very effective in managing this pest when applied in a timely fashion.
It is during this time in the spring that controls can be applied to limit the damage to your trees and shrubs from defoliation. Cedar Lawn recommends two treatments at three to four week intervals for the best control. Please call our office for further information or to schedule treatment for the spring.