Rose Sawfly (Rose Slug) Damage: Identification and Control

Lace-like leaves with holes indicate sawfly larvae (rose slugs)—not caterpillars. They feed on leaf undersides at night.

Identification

• Small, slug-like green/black larvae on leaf undersides
• Feed at night, drop to soil by day
• Cause windowpane then hole damage

Control Methods

• Night inspection + removal (flashlight)
• Insecticidal soap at night
• Horticultural oil spray
• Strong water spray dislodges larvae (can't climb back)
• Soil treatment around base targets pupae

Timing

Monitor when apple trees bloom—sawfly emergence coincides. Multiple generations possible.

Consistent monitoring and mechanical/organic controls manage this common pest effectively.