Forest Pests: Insects, Diseases & Other Damage Agents

Curve-lined Angle (Digrammia continuata)

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. Green body with pale stripes and with reddish spots near spiracles. Green head marked with dark green herringbone pattern on lobes; lateral edges of frons trimmed with greenish white line and spot. Indistinct, grayish middorsal stripe with paired, offset, dark warts bearing hairs between middorsal and subdorsal stripes; wavy, yellow and white subdorsal stripe. Short, usually darkened, oblique line through spiracles; purplish red and greenish yellow on swelling below spiracles, essentially forming broken subspiracular stripe. Up to 25 mm.

Food. Atlantic white-cedar, eastern red-cedar, and northern white-cedar.

Life Cycle. Two generations (at least in southern New England). Pupa overwinters in soil or debris. Mature caterpillar present from June to November.

Comments. We believe that Digrammia orillata, which is associated with northern white-cedar in northern New England and southern Canada, is the same species as the one pictured here. Digrammia species formerly were placed in the genus Semiothisa.

[ Contents ]     [ Previous ]     [ Next ]     [ Home ]