Strawberry-Leafroller

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

Leafrollers are seldom a pest on strawberries, and treatment is usually not necessary.

  • azadirachtin (neem oil)-Some formulations are OMRI-listed for organic use.
  • Bacillus thuringiensis (Bt)-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.

  • Bacillus thuringiensis (Bt) (DiPel DF and other brands)-Consult label for rate. PHI 0 days. Use according to individual manufacturer's directions.
  • chlorantraniliprole (Coragen)-Consult label for rate. PHI 1 day. Do not exceed 0.2 lb ai/a per crop season.
  • flubendiamide (Belt) at 0.075 lb ai/a. PHI 8 days. Do not exceed 0.225 lb ai/a per crop season.
  • methoxyfenozide (Intrepid 2F) at 0.09 to 0.19 lb ai/a. PHI 3 days. Begin applications at first egg hatch or to young larvae when infestations are detected. Do not exceed 64 fl oz product/a per crop season.