Gypsy moth is the most serious pest of oak trees in Maryland. They hatch in late April or early May. For more details and a picture of an egg cluster, log onto www.hgic.umd.edu/_media/documents/hg44_000.pdf.
Eastern tent caterpillar is a common pest of wild cherry trees and hatch in early April. The eastern tent caterpillar is not as serious a threat to trees as the gypsy moth. Click here for a close comparison of these two caterpillars (pdf file).
To learn more, log onto www.hgic.umd.edu/_media/documents/hg21_000.pdf. More.
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