Persistent Pests on Banana Trees and Cannas

Beating Stubborn Stalk-Boring Insects

A gardener battled small gray insects with white wings inside banana and canna stalks. Multiple sprays (Sevin, malathion, soap) killed adults but new ones kept appearing.

Why Sprays Alone Fail

Insects hiding in stalks, soil, or foliage escape treatment. Eggs hatch after spraying, and new adults fly in. A single application never breaks the cycle.

Effective Spray Schedule

Spray thoroughly to runoff every 7 days for at least 6 weeks. Use malathion or a stronger labeled insecticide. Consistency is key—each spray catches a new generation.

Additional Tips

• Remove heavily infested stalks
• Improve air circulation
• Monitor for secondary diseases (brown spots may be fungal)