Control Measures
Larvacides applied in early spring can be effective, but once the caterpillars emerge little can be done. They can be removed from trees by hand and killed by dropping them into a bucket of soapy water. (The soap reduces the water's surface tension. Caterpillars placed in non-soapy water can literally crawl across the surface to escape.) Dusk is a good time to attack caterpillars as they are gregarious and form dense groups on tree trunks and structures at the end of the day.
Read more about this topic: Forest Tent Caterpillar Moth
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