Yucca Beetle Infestation: Likely Spider Mites, Not Beetles

Re-Identification

Red-headed beetles at spine bases are unusual. Symptoms (weak spines, stippling) match spider mites far better. Mites are microscopic; "beetles" may be predators or misidentified.

Spider Mite Treatment

• High-pressure water spray weekly.
• Neem oil or insecticidal soap ×3 at 5-day intervals.
• Predatory mites (Phytoseiulus) for biological control.
• Increase humidity temporarily.

If Truly Beetles

Systemic imidacloprid soil drench (follow label). But verify with magnifier first—mites are 100× more common.

Resource: eHow spider mite control guide (linked).