How do I treat spider mites on Monstera?

Rinse the plant in a shower or with a strong stream of water to dislodge mites and webbing. Spray all leaf surfaces (especially undersides) with insecticidal soap or a 1% horticultural oil solution, repeat every 5–7 days for 3–4 cycles to break the life cycle. For heavy infestations, isolate the plant from other plants for at least 3 weeks. In persistent cases, switch to a different miticide class (e.g. abamectin per label) to avoid resistance.

How do I prevent spider mites on Monstera?

Maintain 50%+ humidity — spider mites struggle above 60% RH. Inspect new plants for 2–3 weeks before mixing with the rest of your collection. Wipe leaves down monthly to disrupt early colonies.

PEST DIAGNOSIS · CITED TO UC IPM — SPIDER MITES

Spider mites on Monstera: how to identify and treat

How to identify spider mites on Monstera

Adult mites are about 0.4 mm long, oval, and pale yellow to red. 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

Rinse the plant in a shower or with a strong stream of water to dislodge mites and webbing.
Spray all leaf surfaces (especially undersides) with insecticidal soap or a 1% horticultural oil solution, repeat every 5–7 days for 3–4 cycles to break the life cycle.
For heavy infestations, isolate the plant from other plants for at least 3 weeks.
In persistent cases, switch to a different miticide class (e.g. abamectin per label) to avoid resistance.

Prevention going forward

Maintain 50%+ humidity — spider mites struggle above 60% RH.
Inspect new plants for 2–3 weeks before mixing with the rest of your collection.
Wipe leaves down monthly to disrupt early colonies.

Life cycle

Egg to adult in 5–20 days depending on temperature; populations explode at 80°F+ and low humidity. A single female lays ~100 eggs over her ~30-day life.

Source

Identification, treatment intervals, and prevention guidance per UC IPM — Spider Mites. Always follow the product label when applying any pesticide or horticultural oil.