Identification on thrips
What's Happening
Thrips are tiny, slender insects (1-2mm) with fringed wings that feed by rasping plant cells and sucking the exuded contents. Their minute size and high mobility make them difficult to detect. Adults can fly short distances, while larvae crawl along stems. Thrips often hide in leaf sheaths, flower buds, and soil crevices during the day, becoming active in low light. They enter collections via contaminated plants, potting soil, or through open windows. Their rapid reproduction cycle (2-3 weeks) allows populations to explode quickly once established.
How to Fix It
- 1
Perform the paper test: Shake affected leaves over white paper and look for tiny, dark, elongated specks moving rapidly
- 2
Inspect for characteristic damage: Silvery, translucent patches on leaves where cells have been rasped away
- 3
Look for black fecal specks (frass): Tiny black dots scattered on leaves indicate thrips feeding activity
- 4
Check leaf undersides and growing tips with 10x magnification: Adults are slender and dark; larvae are pale and worm-like
- 5
Examine flower buds: Thrips prefer to feed and reproduce in enclosed spaces like developing flowers
How to Prevent It
Quarantine new plants for 2-3 weeks with frequent inspections; inspect under magnification before purchase; avoid bringing cut flowers near houseplant collections.