Key to Identifying Larvae
Talerico, R. L. 1978. Major Hardwood Defoliators of the Eastern United States. U.S. Department of Agriculture. Home and Garden Bulletin 224. 22 p.
|KEY No||Refer To Key No|
|1.||A. Larva feeds and lives within a leaf roll or several leaves.
B. Larva feeds freely, does not construct leaf roll or leaf mat.
|2.||A. Head pale brown except for a longitudinal black bar on the lower cheek (side of head); region immediately behind pale brown - Oak Leaftier
B. Head with irregular black markings on other areas besides cheek; often most of head dark brown to black; region immediately behind head usually darkened on top and sides - Oak Leaf Roller
|3.||A. Larva hairy or with tufts of hair on each body segment.
B. Larva with few body hairs, almost bare.
|4.||A. Larva dusty or sooty black; on back, a double row of 5 pairs of dark blue spots followed by a double row of 6 pairs of brick red spots - Gypsy Moth
B. Larva dark blue black; whitish-yellow, keyhole-shaped spots on back - Forest Tent Caterpillar
|5.||A. Larval body bright yellow; back with 10 black wavy lengthwise lines; rusty-brown head - Linden Looper
B. Larval body not bright yellow.
|6.||A. Larval body and head cream colored with many lengthwise black wavy lines - Half-Wing Geometer
B. Larval body light to dark green.
|7.||A. Larva may have a lengthwise dark brown stripe on back of white lengthwise lines; three pairs of hind legs, one pair smaller and in front of others - Fall Cankerworm
B. Larval body a dull slate black, variable; two pairs of hind legs; rust-colored head - Elm Spanworm