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Indoor Plant Care
Pest diagnosis · Cited to UC IPM — Spider Mites

Spider mites on Pilea peperomioides: how to identify and treat

How to identify spider mites on Pilea peperomioides

Adult females, the largest stage, are less than 1/20 inch long, with an oval body that usually has a dark blotch on each side (per UC IPM). Easier to spot than the mites themselves: fine silk webbing on leaf undersides and the petiole, plus tiny pale dots on the upper leaf surface where chlorophyll has been depleted.

Damage signs to look for

Stippled or sandblasted yellow-to-bronze speckling on leaves, fine webbing on leaf undersides and where petioles meet stems, leaves yellowing and dropping, slowed growth.

Treatment ladder

  1. 1Rinse the plant in a shower or with a strong stream of water to dislodge mites and webbing.
  2. 2Spray all leaf surfaces (especially undersides) with insecticidal soap or horticultural oil, following the label. UF/IFAS Extension advises two or more miticide applications, at five-day intervals in summer or seven-day intervals in winter.
  3. 3Isolate an infested plant from your other plants right away so the mites don’t spread, as UC IPM advises.
  4. 4In persistent cases, keep using selective materials such as insecticidal soap or oil rather than broad-spectrum insecticides, which can make spider mite outbreaks worse.

Prevention going forward

  • Keep plants watered and leaves free of dust — spider mite damage is usually worst in hot, dusty conditions and on water-stressed plants.
  • Keep newly acquired plants isolated for 2–3 weeks before mixing them with the rest of your collection, as Missouri Botanical Garden recommends.
  • Check leaves regularly, undersides included. UC IPM advises checking new plants weekly, then monthly once several weeks pass with no problems.

Life cycle

Under favorable conditions a generation can be completed in less than a week. Spider mites reproduce rapidly in hot weather and favor hot, dusty conditions.

Source

Identification, treatment, and prevention guidance per UC IPM — Spider Mites, with other figures from UF/IFAS Extension — Twospotted Spider Mite, UC IPM — Houseplant Problems and Missouri Botanical Garden — Spider Mites as named in the text. Always follow the product label when applying any pesticide or horticultural oil.

See also