Strawberry leafroller (Ancylis comptana fragariae)
Western strawberry leafroller (Compsolechia fragariella)
Pest description and crop damage The adult is a reddish brown moth with distinctive yellow markings on the forewings, and has a wingspan of about 11-14 mm. Eggs are laid on leaves in clusters; they are translucent to pale green at first but turn yellowish as they reach maturity. They hatch in about 10 to 14 days. The larvae are pale green at first but change to grayish brown as they feed and mature. Mature larvae are about 12 mm long. The larvae roll and tie leaves together with silk for shelter and feeding, and wriggle and thrash about violently when disturbed. Larval feeding on buds can damage developing flowers which results in deformed fruit.
Biology and life history Strawberry leafrollers overwinter as larvae on strawberry plants. The adult moths appear in May and lay eggs on the foliage. Adults can be seen throughout the growing season as there may be several generations per year.
Scouting and thresholds Inspect leaves for evidence of larvae; look for rolled leaves and silken tubes on the underside of leaves.
Management-chemical control: HOME USE
NOTE: Leafrollers are seldom a pest on strawberries, and treatment is usually not necessary.
- Azadiractin/neem oil-Some formulations are OMRI-listed for organic use.
- Bacillus thuringiensis var. kurstaki (Btk)-Some formulations are OMRI-listed for organic use.
- bifenthrin
- carbaryl
- horticultural oils
- insecticidal soap-Some formulations are OMRI-listed for organic use.
- kaolin-Applied as a spray to leaves, stems and fruit it acts as a repellent to some insect pests. Some formulations are OMRI-listed for organic use.
- malathion
- permethrin
- plant essential oils (garlic, peppermint, rosemary)-Some formulations are OMRI-listed for organic use.
- pyrethrins (often as a mix with other ingredients)-Some formulations are OMRI-listed for organic use.
- spinosad-Some formulations are OMRI-listed for organic use.
Management-chemical control: COMMERCIAL USE
Leafrollers are seldom a pest on strawberries, and treatment is usually not necessary.
- azadiractin (Ecozin Plus and others)-Consult label for rate and use directions. PHI 0 days. Some formulations are OMRI-listed for organic use.
- Bacillus thuringiensis (Bt) (DiPel DF and other brands)-Consult label for rate. PHI 0 days. Use according to individual manufacturer's directions.
- bifenthrin (Brigade and others) at 0.04 to 0.2 lb ai/a. PHI 0 days. Hazardous to bees. Restricted use pesticide.
- carbaryl (Carbaryl 4L and others) at 1.0 to 2.0 lb ai/a. PHI 7 days. Hazardous to bees.
- Chromobacterium subtsugae (Grandevo)-Consult label for rate. PHI 0 days. Can repel honeybees; time application so that pollination is not disrupted.
- diazinon (several brands) at 0.4 to 0.5 lb ai/a. PHI 5 days. Hazardous to bees. Restricted use pesticide.
- fenpropathrin (Danitol) at 0.3 to 0.4 lb ai/a. PHI 2 days. Hazardous to bees. Restricted use pesticide.
- alubendiamide (Belt SC) at 0.063 to 0.08 lb ai/a. PHI 8 days.
- malathion-Consult label for rates. PHI 3 days. Hazardous to bees.
- pyrethrins (PyGanic) at 0.01 to 0.05 lb ai/a. PHI 0 days. Hazardous to bees. Some formulations OMRI-listed for organic use.
- spinosad (Entrust and Success) at 0.063 to 0.094 lb ai/a. PHI 1 day. Toxic to bees. Apply at least 3 hr prior to bee or other pollinator presence at site.
- spinetoram (Radiant SC) at 0.05 to 0.08 lb ai/a. PHI 1 day. Highly toxic to bees.
- tolfenpyrad (Bexar) at 0.28 lb ai/a. PHI 1 day. Hazardous to bees.