Sawfly Larvae (Rose Slugs) on William Baffin Rose

Green Caterpillars Skeletonizing Leaves in Wisconsin

½-inch translucent green larvae with light brown heads on leaf undersides. William Baffin nearly defoliated. Also spider mites on another rose.

Control

• Horticultural oil for sawfly larvae.
• Any rose insecticide works.
• Spray entire bush, including base where eggs are laid.
• Water/alcohol mix for spider mites (test first).

Mild winter/weird spring increases pest pressure.