White Lumps on Grapevine: Insect or Disease?

Pea-Sized White Bumps on Grapevine Canes

Foamy, cottony lumps with black crust on grapevine branches could be scale insects, mealybugs, or a fungal growth. Accurate ID requires a clear close-up photo.

Immediate Actions

• Prune out affected canes if limited
• Monitor for spread
• Take sharp photos for local nursery/Extension ID

Common Possibilities

• Cottony maple scale / mealybugs
• Grape cane gallmaker
• Fungal fruiting bodies (less likely)

Once identified, choose targeted treatment: horticultural oil for scale, insecticidal soap for mealybugs, or fungicide if fungal.