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Caterpillars on prunus tree - Lymantria dispar

Caterpillars on prunus tree - Lymantria dispar
Allentown, Lehigh County, Pennsylvania, USA
May 30, 2015
Size: 25mm
A cluster of these on the underside of a branch on a flowering plum tree. I assume they are bad news. They are presumably all the same species, even though they have different coloration?


Moved from ID Request.

Gypsy moth caterpillar.
Lymantria dispar. With any luck you might find Calosoma sycophanta in the vicinity. The Forest caterpillar hunter.

Thanks - I'll have to keep my
Thanks - I'll have to keep my eye out for those beetles.

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