How to identify
- Copper-orange adults with 16 black spots
- Yellow fuzzy larvae on leaf undersides
- Leaves skeletonized between veins
Damage: Defoliation and reduced pod set.
Control methods
- Hand-pick adults and larvae; crush yellow egg masses.
- Plant a short succession so peak damage does not hit every planting.
- Avoid broad insecticides that kill Pediobius wasps that parasitize larvae.
What products to use
We list product types and what to check on the label — not brand rankings, prices, or “we tested” claims. Always follow the label for your crop, and prefer the least disruptive option that works.
Insecticidal soap or neem (larvae)
When: Young larvae on undersides
Look for: Labeled for Mexican bean beetle or leaf beetles on beans; hit undersides