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Gypsy moth defoliation accelerates during May and most of June as the caterpillars near full size (about 1 1/2 to 2 inches). It's the time when their presence is easiest to detect, because defoliation may diminish as the caterpillars pupate and trees grow some replacement leaves. The caterpillars molt as they progress to their fourth and final instar prior to pupation. At each molt they change their patterning and coloration, but remain very hairy. The youngest caterpillars are all black, the intermediate caterpillars have yellow or orange spots on their backs, and in the last instar the caterpillars are very distinctive. The have four pairs of blue dots followed by five pairs of red dots on their backs. You may miss seeing caterpillars, but notice brown mottled moths flying about in late June or early July. If you suspect gypsy moth caterpillars, pupae, moths or egg masses; please check the links below for gypsy moth information and photos. The Virginia Tech information and photos on gypsy moth identification may be particularly helpful.
Please be aware that other caterpillars are often mistaken for gypsy moth caterpillars. For example, the highly visible nests of eastern tent caterpillars (frequently built in the crotches of small cherry trees) are often mistakenly taken as gypsy moth infestations. However, gypsy moths do not build nests. You may want to visit the Fairfax County site on caterpillars confused with gypsy moth caterpillars to help with identification.
It is important to report any evidence of gypsy moths. Populations can grow very quickly as each female moth can lay several hundred to a thousand eggs. Treatment areas targeted for spraying in spring through Virginia's voluntary program need to be identified and mapped the previous fall.
To make a report or obtain further information, contact the Montgomery County Gypsy Moth Program Coordinator at the number and addresses below:
Charles Putnam
Gypsy Moth Program Coordinator
Montgomery County Government Center
755 Roanoke St., Ste. 1G
Christiansburg, VA 24073
Phone: 382-5790
Email: putnamcw@montgomerycountyva.gov
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