Yucca Blossom Pests: Yucca Moths, Beetles, and Boll Weevil Threats

Normal Pollination Biology

Yuccas rely exclusively on yucca moths (Tegeticula spp.) for pollination. The white moths in flowers are likely pollinators—their larvae eat some seeds but ensure plant reproduction. Orange-red beetles may be nectar feeders; usually harmless.

Real Threat: Yucca Boll Weevil

Scyphophorus yuccae larvae bore into the crown, killing the plant. Adults resemble small boll weevils (snout beetles). If you see these:

• Apply systemic insecticide (imidacloprid) as soil drench per label.
• Remove and destroy infested flower stalks.
• Monitor crown for frass (sawdust-like excrement) or soft spots.

Blossom Drop Causes

If flowers dry and fall without setting fruit: inadequate pollination (no moths), water stress, or nutrient imbalance. Ensure plants aren't overwatered; yuccas prefer dry conditions.