Controlling Rose Sawfly (Rose Slug) Larvae with Sevin Dust

Ann battled tiny green worms skeletonizing rose leaves for a second year. They fed on leaf undersides, evading sprays. Jay identified them as rose sawfly larvae (rose slugs)—not true caterpillars, but primitive wasp larvae.

Effective Treatment

• Sevin Dust (carbaryl): Apply to both leaf surfaces and soil around the base. Reapply after rain.
• Why dust works: Larvae must contact it; spray often misses undersides.
• Safety: Labeled for vegetables; follow label strictly.

Integrated Approach

1. Scout early (May/June) for first generation.
2. Remove heavily infested leaves.
3. Encourage birds and parasitic wasps (natural enemies).
4. Clean up leaf litter in fall to reduce overwintering pupae.

Note: Sevin is toxic to bees—apply only when roses are not in bloom or at dusk.