Thrips 🐛
Order thysanoptera
At a glance
- Looks like: Tiny tan, yellow, or black slivers that move fast when disturbed
- Tell-tale sign: Silvery scraping scars plus tiny black fecal specks on leaves or flowers
- Severity: Serious — they hide well, spread easily, and can scar new growth fast
How to identify
Thrips are very small, narrow insects that rasp plant tissue and suck up the leaking cells. You usually notice the damage before the insect: silvery or bronze streaking, rough scarred patches, distorted new leaves, damaged flowers, and tiny black specks of frass. Tap a leaf or flower over white paper; moving slivers are a strong clue.
Damage
Feeding scars leaves and flowers, distorts new growth, and can reduce vigor. Some thrips transmit plant viruses, so persistent infestations deserve quicker action than a few cosmetic aphids outdoors.
Treatment (least-toxic first)
Following Integrated Pest Management:
- Isolate and rinse the plant, especially new growth and leaf undersides.
- Prune the worst flowers or shoots where thrips are hiding; bag the debris.
- Use blue or yellow sticky cards to monitor adults.
- Insecticidal soap or horticultural oil can help on contact, but repeat coverage matters because thrips hide in buds and folded leaves.
- Avoid broad sprays outdoors where beneficial insects can suppress them.
Prevention
Quarantine new houseplants, inspect flowers and unfurling leaves, and avoid drought stress. Outdoors, protect beneficial insects and avoid unnecessary insecticides.
Affects (in this guide)
Monstera · Alocasia Polly · Anthurium · Peace Lily · many flowering outdoor plants