Black and Red Beetles on Yucca After Lawn Fungicide: Coincidence, Not Cause

Black and Red Beetles on Yucca After Lawn Fungicide: Coincidence, Not Cause

Tiny black and red insects swarming yucca plants two days after lawn fungicide application are unrelated to the treatment. Fungicides do not attract or cause insect outbreaks. The beetles (likely a harmless seasonal species) appeared coincidentally.

Control

• Spray yuccas thoroughly with malathion or carbaryl (Sevin).
• Drench foliage and stems; beetles often congregate in leaf axils.
• Note: They may emit a sweet odor when disturbed.

Observation

The beetles may not damage yuccas significantly, but treatment provides peace of mind. Monitor for recurrence; they are often a temporary spring phenomenon.

No need to alter lawn care routine; fungicide and insect presence are independent.