Giant Yucca Trunk Holes and Goo – Borer Infestation

50-Year-Old Yuccas with Dark Holes and Sap

Trunks have ½–3 inch dark holes, some seeping goo. Leaves dull, more dead foliage.

Borer Attack

Moth larvae or weevils are boring into trunks. Can kill the plant if extensive.

Treatment

• Systemic insecticides: lindane or chlorpyrifos (Dursban) for borers. HIGHLY TOXIC—use extreme caution.
• Protect remaining yuccas with preventive treatment.
• Remove and destroy any dead yucca immediately to prevent spread.

Consult a licensed arborist for large specimen trees.