Leafrollers are caterpillars of various moths that gorge themselves on foliage and then pupate within the protection of rolled up leaves making it hard to kill them with any traditional insecticide.
Some of the adult moths of the leafroller caterpillars are brown or gray, 1/4 - 1/2 inch long; larvae are dark to light green or cream to yellow, 3/8 - 1- 3/4 inch long. In many cases, there can be 2 generations annually, one in spring and the other in late summer.
Emergence Time - Leafrollers overwinter as pupae in garden debris, and the moths appear in spring.
Symptoms Of Leafrollers
Holes are chewed in flower buds and leaves are rolled up and bound with strands of silk. Many kinds of leaves are skeletonized, causing them to turn brown and drop in late summer.
The redbanded leafroller may skeletonize the leaves of hemlock trees, causing them to turn brown and drop in late summer.