Eventually, they enshroud leaves and then whole branches in a loosely spun tent of silk, within which larval development and feed- ing occurs, so that leaf fragments, cast skins, and droppings become incorporated. … Two forms of the red-headed race of the fall webworm larva.

What does a fall webworm turn into?

Pupae: Full-grown larvae leave the web to pupate in leaf litter or bark crevices. Fall webworms overwinter in the pupal stage. Pupation occurs in thin cocoons. The pupae are brown.

What do spring webworms turn into?

Webworm Life Cycle As they grow, they enlarge the web to cover more foliage. If the population is large, several branches or even an entire small tree can be encased in webbing. The caterpillars mature in about six weeks and drop to the ground to pupate.