Tarnished Plant Bug

• Small brown bug (about 1/4 inch) with pale yellow triangular mark on the back; hides in flowers and leaf crevices
• On strawberries: deformed, cat-faced fruit with hard tips where the bug fed during bloom
• On beans, peppers, and other crops: pitting or scarring on fruit; flower and bud drop
• On lettuce and leafy greens: brown spots or collapsed tissue at feeding sites
• Distorted new growth, stunted shoots, and aborted flowers are the classic general symptom

Highly mobile piercing-sucking insect feeding on sap and injecting enzymes that damage tissue. Overwinters as adults in leaf litter, weedy field edges, and crop debris. Emerges in spring to lay eggs in weed hosts (pigweed, lambsquarters, clover) before moving to garden crops. Multiple generations per year; peak damage coincides with flowering and fruit set. Because adults fly readily, infestations can appear overnight.

1. 01Mow or pull flowering weeds around the garden in early spring — deprives overwintering adults of egg-laying hosts
2. 02Check strawberries, beans, and peppers daily during bloom; hand-pick adults and nymphs into soapy water (they drop when disturbed, so hold a tray underneath)
3. 03Row cover during flowering for strawberries and beans if populations are heavy — but remove for pollination if needed
4. 04Keep the garden edges clean and mulched; avoid letting weedy strips bloom near vulnerable crops
5. 05Neem oil or insecticidal soap reduces nymph populations; adults are harder to kill and tend to fly away
6. 06Encourage big-eyed bugs, damsel bugs, and parasitic wasps — all are natural enemies suppressed by broad-spectrum sprays

If you're seeing repeated bloom-time damage despite weed management, your extension office can help identify the specific Lygus species (there are several regional ones) and advise on timing of any sprays to avoid harming pollinators.

• Tarnished Plant Bug— University of Minnesota Extension
• Tarnished Plant Bug in Strawberries— Penn State Extension