Squash Bugs

Also known as: Anasa tristis

Identification

Gray-brown shield-shaped bugs, 15mm. Bronze-colored egg clusters on leaf undersides in V-patterns along veins. Nymphs are green-gray with black legs.

Damage

Sucking — pierce stems and leaves, inject toxin causing wilt; vector for cucurbit yellow vine decline

Best Organic Solutions (Ranked)

Solutions ranked by reliability tier — start with Tier A options.

Neem Oil Tier A

Antifeedant + IGR on nymphs

Insecticidal Soap Tier A

Works on nymphs only — adults have hard shell

Pyrethrin Tier A

Emergency adult knockdown

Biological Controls

Tachinid flies (Trichopoda pennipes) parasitize adults. Egg parasitoids.

Prevention

Inspect leaf undersides weekly and crush egg clusters. Board traps — lay plywood near plants overnight, crush hiding bugs in morning. Row covers until flowering. Crop rotation.

Common Mistake

Waiting until adults are established — squash bugs are nearly impossible to control as adults. Target eggs and nymphs early.