When is the prime time for observing active feeding damage from spongy moth caterpillars?

Answer

When they hatch in the spring and feed actively until mid-summer

Caterpillars hatch in the spring, typically late April or May, and feed actively until mid-summer, which is when feeding damage, such as skeletonized leaves, is most evident.

When is the prime time for observing active feeding damage from spongy moth caterpillars?
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