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Diagnosing Deformed Nepenthes Leaves: Thrips vs. Spider Mites

Chris noticed twisted, curled new growth on a N. ventricosa × aristolochioides (and a basal shoot) two months after purchase. Other nepenthes nearby were fine. Grown on a rack in a bright SSW window with distilled water.

Plant

Closeup

Jeff Dallas suspected pests. He advised close inspection with a hand lens for thrips (tiny, elongated bugs on leaf undersides). If found, treat with Bayer Rose & Flower insect killer or commercial insecticidal soap (safe on Nepenthes, not on sundews/butterworts/flytraps).

Follow-up: Chris found round, reddish-orange, fast-moving mites—likely spider mites. Jeff recommended insecticidal soap (arthropods don't easily develop resistance), treating all nepenthes, and checking other houseplants. Follow label directions carefully to avoid phytotoxicity.

Good Growing!

Jeff Dallas
Sarracenia Northwest
https://www.cobraplant.com

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