Warmer temperatures may allow balsam woolly adelgid to increase, while dampening the effects of the eastern spruce budworm in the northern New England and New York.

Many insect species are limited by extremely cold temperatures, and evidence suggests that several insect species may increase in a warmer climate, including the balsam woolly adelgid. At the same time, the native spruce budworm may be reduced under the warmer conditions expected in the future as its range shifts farther northward into Canada.