As new leaves emerge in spring, the eggs hatch and larva build nests at branch crotches. During bright days larva leave the nest to feed on foliage and return to the nest in the evening. Generally, during rainy weather or on very dark cloudy days, larva remain in the nest. There is one generation per year. If populations are high, they may defoliate a tree.
Defoliated trees can become stressed allowing secondary problems to occur.
Newly planted trees can be stressed easily. Remove webs by pruning out on a cloudy day or when darkness falls. And dispose of the nest. Inspect trees for egg masses and remove before spring. Naturally occurring parasites help reduce populations of Eastern Tent Caterpillar.