Thrips on Nepenthes: Identification, Neem vs. Pyrethrin, and Greenhouse-Wide Treatment

An Oregon grower with 50+ Nepenthes in a climate-controlled greenhouse noticed rusty, deformed new leaves on four plants. Hand-lens inspection revealed tiny, fast, white bugs—likely thrips larvae causing the damage.

Jeff Dallas confirmed thrips: adults are slender and hard to see; larvae do most damage. He endorsed treating all nearby plants preventatively. Neem oil (longer residual) or pyrethrin (reapply per label) both work. A No-Pest strip in the enclosure is also effective for contained spaces.