Nepenthes Spider Mite Infestation: Identification and Treatment Options

Symptoms

Tiny black/yellow dots on leaves, cobweb-like substance at leaf junctions, brown patches, and small flimsy new growth indicate spider mites.

Treatment Options (UK Context)

Biological Control (Preferred)

Predatory mites from garden/hydroponic suppliers. They're effective long-term and natural. Identify mite species with a hand lens for correct predator selection.

Chemical Options

• Insecticide strips (e.g., Dichlorvos/No-Pest Strips): Hang strip, cover plant with clear bag for a few days. Highly toxic—follow labels.
• Systemic sprays (Acephate/Orthene/Isotox): Effective against mites but toxic. Ensure spider mites are on label; repeat per instructions for hatching eggs.
• Permethrin: Non-systemic, safer for humans, less odor. Requires strict spray frequency.

Indoor Application Tips

Spray outdoors or in garage if possible. Once dry, systemic residues are minimal. Systemics absorb quickly and persist ~30 days. Top-watering doesn't wash them out rapidly.

Good Growing!
Jeff Dallas
Sarracenia Northwest
www.cobraplant.com