Yucca Cane Borer: Sawdust Means Larvae Inside

Identify the Pest

Sean's "sawdust strings" from the cane indicate yucca cane borer—a moth/butterfly larva tunneling inside the trunk.

Urgent Treatment

1. Contact county extension for approved insecticide injection.
2. DIY option: inject 70% isopropyl alcohol/water mix into holes using marinade injector.
3. Repeat until no fresh sawdust appears.

Prevention

Inspect yuccas regularly for entry holes. Keep plants vigorous—stressed plants attract borers. Outdoor yuccas in endemic areas may need preventive systemic treatment.

Prognosis

Early detection saves the plant. Advanced tunneling weakens trunk structurally; may need to cut and re-root top section.