Thrips on monstera adansonii
What's Happening
Thrips (Frankliniella and Thrips spp.) have a unique complete metamorphosis lifecycle that includes a soil-dwelling pupal stage. After feeding on Monstera adansonii foliage as larvae, thrips drop to the soil to pupate in the top 2-3 inches of substrate for 2-5 days before emerging as winged adults. This soil phase is invisible and resistant to foliar sprays, creating a reinfestation cycle every 2-3 weeks if not targeted specifically.
How to Fix It
- 1
Apply soil drench with spinosad or neem oil solution (1 tsp neem + 1/4 tsp dish soap per liter water) directly to soil surface until water drains from bottom
- 2
Replace top 2-3 inches of soil with sterile potting mix 24 hours after soil drench treatment
- 3
Add beneficial nematodes to soil (follow package rates) to target pupal stage thrips hiding below surface
- 4
Use yellow sticky traps positioned horizontally at soil surface to catch adults as they emerge from pupation
- 5
Maintain 4-6 week treatment cycle even after visible thrips disappear to ensure complete lifecycle elimination
What You'll Need
How to Prevent It
Replace top 2-3 inches of soil with fresh sterile mix after initial treatment; use yellow sticky traps at soil surface to intercept emerging adults; apply beneficial nematodes (Steinernema feltiae) monthly to soil for continuous pupae predation; quarantine new plants for 14 days with soil inspection.