Ornamental and Turf Pesticide Applicators Practice Exam

The distinguishing characteristic of eastern tent caterpillars is their habit of constructing webs specifically in tree crotches. This location provides them with a secure environment that helps protect them from predators while they feed on the leaves of the host tree. These webs are typically formed in the forked areas of branches, providing a communal space for the caterpillars to gather, feed, and develop.

In contrast, fall webworms create their webs at the ends of branches rather than in the tree crotches. Their webs are also usually enveloping the foliage they consume, which allows for different feeding and protective strategies. This fundamental difference in web placement is key to identifying the two species.

Overall, the preference of eastern tent caterpillars for tree crotches is a significant factor in the understanding of their behavior and ecological interactions compared to fall webworms.