Pest description and crop damage Adults are grayish moths about 0.4 inch long with a wide white band on each forewing. Larvae are chocolate-brown with black heads up to 1 inch long.
Larvae spend the winter in a cocoon on the bark in the crotches of small-diameter limbs. They become active around bud break and feed on leaves and buds, webbing together leaves and feeding within these nests. After feeding they pupate within the nest and adult moths emerge in early to mid-summer. Eggs are laid on the lower surface of leaves. The larvae emerge and feed on the lower leaf surface until early August, at which time they construct their overwintering cocoons (hibernacula). Feeding on buds in early spring can be particularly damaging for small trees
Pest monitoring Look for larvae in nests of webbed-together leaves in the spring. Compare with similar pests such as leafroller and omnivorous leaftier. Note that adult moths have a pheromone component in common with filbertworm and may occasionally be caught in filbertworm traps. The two moths are about the same size and shape, but filbertworm can be distinguished by the gold scales on the wings.
Management-chemical control: HOME USE
Management-chemical control: COMMERCIAL USE
- Bacillus thuringiensis var. kurstaki-See label for rates. PHI 0 days. Apply with spreader-sticker. Some formulations are OMRI-listed for organic use.
- chlorpyrifos-Generic labels for chlorpyrifos are also available.
- Lorsban Advanced at 3 to 4 pints/100 gal. PHI 14 days. REI 1 day. No more than three applications per season. Do not graze livestock in the treated area. Extremely toxic to fish. Toxic to birds and wildlife. RESTRICTED USE IN OREGON.
- chlorpyrifos/gamma-cyhalothrin (Cobalt) at 6.5 to 14.2 oz/100 gal water (26 to 57 fl oz/a). PHI 14 days. Do not make more than 3 applications per season of Cobalt or other product containing chlorpyrifos for hazelnuts. RESTRICTED USE IN OREGON.
- diflubenzuron (Dimilin 2L) at 8 to 16 oz/a. Up to four applications per season. PHI 28 days. REI 12 hr.
- flubendiamide (Belt SC) at 3 to 4 oz/a. PHI 14 days. REI 12 hr. Do not exceed 12 oz/a per year or 4 oz per 7 day interval.
- methoxyfenozide (Intrepid 2F and generics) at 8 to 16 oz/a. PHI 14 days. REI 4 hr.
- methoxyfenozide + spinetoram (Intrepid Edge) at 6 to 12 oz/a. Apply at initiation of egg hatch, if necessary reapply after 14-21 days, but not before 14 days. PHI 7 days. REI 4 hr. No more than 12 fl oz/a/season.