Field Identification
A greenish-yellow leaf beetle with twelve black spots that chews cucurbit seedlings, flowers, and fruit rinds and vectors bacterial wilt through Erwinia tracheiphila. Adults fly; larvae feed on roots of many grasses and some crops.
About 6 mm long, bright green-yellow with variable spot pattern; rapid flight when disturbed. Larvae are slender white rootworms. Southern form howardi is the usual culprit in warm regions.
How to Deal With It
Organic Control Methods
Kaolin clay films deter feeding and oviposition; neem and pyrethrin-based botanicals offer short knockdown—reapply after rain; rotate materials.
Ground beetles, soldier beetles, and spiders take adults; nematodes and fungi can target soil stages where products are permitted.
Delay planting behind row covers until vines run; remove alternate hosts; deep mulch may reduce larval survival modestly.
Floating row covers until pollination; vacuum in high tunnels at dawn.
Blue or yellow sticky traps for monitoring; choose parthenocarpic varieties under cover to extend protection.
Let Nature Handle It
Natural Enemies
- Ground beetles
- Soldier beetles
- Spiders
Threat Map