It depends on the insect. It also depends on the life stage of the insect. If it's larvae under the bark and you chip up the tree, it can't complete its life cycle. However, for something such as the mountain pine beetle, the approach is cutting and burning the trees and then also doing the delimitation survey in the area to determine if it really is only one tree or if there are others in the area that you'd have to address as well.
On October 2nd, 2018. See this statement in context.