Forest Pests: Insects, Diseases & Other Damage Agents

White-lined Leafroller (Amorbia humerosana)

Maier, C.T., C.R. Lemmon, J.M. Fengler, D.F. Schweitzer, and R.C. Reardon. 2004. Caterpillars on the Foliage of Conifers in the Northeastern United States. FHTET-2004-1. Morgantown, WV: USDA Forest Service, Forest Health Technology Enterprise Team; 151 p.

Description. Grayish and yellowish green body with marked head and prothoracic shield; variable body color. Orange-brown head with broad, horizontal dark brown streak over white line. Orange-brown prothoracic shield edged laterally with dark brown. Brownish anal plate darker than body. Up to 30 mm.

Food. Many trees and shrubs, including balsam fir, eastern hemlock, eastern larch, pines, and spruces.

Life Cycle. One generation. Pupa overwinters in debris on ground. Mature caterpillar present from July to September.

Comments. We also have seen a variety with a mainly brownish body (see below).

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