Grapevine Caterpillars in Ontario: Sevin Control

Managing Leaf-Feeding Larvae

Ontario grapevine eaten by tiny black/brown caterpillars/grubs with holey, brown-spotted, curling leaves—likely grape berry moth larvae or similar. Sevin (carbaryl) is labeled for grapes and effective.

Application Notes

• Spray thoroughly, especially leaf undersides.
• Follow label intervals and pre-harvest interval.
• Monitor—usually don't cause severe defoliation.

If organic preferred: Bt (Thuricide) for caterpillars only, or spinosad (broader, organic-approved). But Sevin is standard where registered.