Cnephasia longana
Pest description and crop damage Caterpillars are up to 0.6 inch long and light cream to gray, with a light stripe on each side of the back. The head is brown. They feed on terminal hop buds causing lateral growth, which may necessitate extra training.
Management-chemical control
- azadirachtin (various formulations)-See label for rates. PHI 0 days. REI 4 hr. Works best on early larval stages. Applications can be repeated every 7 days or as needed. Some formulations are OMRI-listed for organic use.
- Bacillus thuringiensis (various formulations)-See label for rates. PHI 0 days. REI 4 hr. Works best on early larval stages. Repeat treatment as needed. Some formulations are OMRI-listed for organic use. Group 11A insecticide.
- pyrethrins/azadirachtin (Azera) at 0.013 to 0.0044 lb ai/A azadirachtin/0.014 to 0.048 lb ai/A pyrethrins. PHI 0 days. REI 12 hr. Apply when pest populations first appear. Reapply every 5-7 days as needed up to 10 times per season. Do not apply more than 0.050 lb ai/A pyrethrins per season. Some formulations are OMRI-listed for organic use. Group 3 insecticide.