Grapevine looper, Eulythis diversilineata (Hubner)

The grapevine looper is not currently considered an important pest of grape, although it has risen to pest status in the past. Eggs overwinter on canes in crescent-shaped rows of eight to twelve. Eggs hatch in early June in Pennsylvania, although a larva was collected in April in Virginia. Larvae feed on foliage for six to eight weeks. Food plants include grape and Virginia creeper. Larvae are of the measuring-worm type, with prolegs only on the last two segments of the abdomen. Color of larvae is highly variable, ranging from yellow-green to red to nearly black. Larvae reach a length of about 4 cm. The pupal stage lasts about ten days and is spent in a loose web spun before pupation on a leaf or berry cluster. Adults emerge in midsummer and lay overwintering eggs. Adults live two or three days. There is one generation annually. A related species, the greater grapevine looper, E. gracilineata Guenee, has been more commonly collected in North Carolina in some years.

This is taken primarily from an extension bulletin by D. G. Pfeiffer & P. B. Schultz, entitled "Major Insect and Mite Pests of Grape in Virginia" (Va. Coop. Ext. Serv. 444-567 (1986))
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