🦟 Thrips
Various species
Tiny juice-box straws with wings and a bad attitude.
How to identify
Barely visible — slender, fringed-wing insects about 1/16 inch, usually yellow, brown, or black, hiding inside flowers and leaf folds. Shake a suspect blossom over white paper: the moving slivers are thrips, and you'll see tiny black specks (their frass) alongside.
Damage signs
Leaves develop silvery, scratched-looking patches where cell contents were sucked out, and flowers emerge deformed, streaked, or fail to open. Onions get silvery leaf streaks ('white blast'), and thrips also spread tomato spotted wilt virus — the real damage multiplier.
Non-chemical controls
- Hang blue sticky traps just above the canopy — thrips prefer blue the way leafminers prefer yellow, and the traps double as a monitoring tool.
- Blast plants with a strong water jet, focusing on flowers and growing tips where thrips hide; repeat weekly.
- Spread reflective silver mulch to confuse and repel the tiny fliers before they land.
- Release Amblyseius cucumeris predatory mites, which patrol flowers and eat thrips larvae.
- Pull and trash badly infested flowers and buds — each one is a thrips nursery and a virus reservoir.
- Keep weeds down around the garden; chickweed, dandelion, and wild onion are thrips hotels between crop seasons.
Nerdy fact: Thrips punch holes in plant cells and slurp the contents — their mouthparts work like a tiny juice-box straw. Rude, but mechanically impressive.