What should be sprayed on plants for spider mites? - briefly
Apply horticultural oil (e.g., neem oil) or a certified insecticidal soap, covering all leaf surfaces and undersides. Repeat the treatment every 5–7 days until the mites are eradicated.
What should be sprayed on plants for spider mites? - in detail
Effective control of spider mites relies on selecting sprays that target the mites without harming the host plant.
Neem oil, applied at 1–2 % concentration, disrupts mite feeding and reproduction. Mix the oil with a mild surfactant, spray until runoff, and repeat every 7–10 days while the infestation persists.
Insecticidal soap, containing 2–5 % potassium salts of fatty acids, kills mites on contact. Use a fine mist to fully cover leaves, especially the undersides, and reapply after rain or irrigation.
Horticultural oil (e.g., mineral or petroleum‑based) works similarly to neem oil but without the botanical residue. Dilute to 1 % and apply during cooler parts of the day to avoid phytotoxicity.
Pyrethrin formulations, at label‑recommended rates, provide rapid knock‑down. Limit use to a few applications per season to prevent resistance development.
Spinosad, a bacterial fermentation product, is effective against mobile stages of the mite. Apply at 0.5–1 ml L⁻¹, ensuring thorough coverage.
For organic growers, a combination of neem oil and horticultural oil offers broad coverage with minimal residue.
When using any spray, follow these procedural guidelines:
- Test on a small leaf area 24 hours before full application.
- Apply in early morning or late afternoon to reduce leaf burn.
- Ensure complete wetting of the leaf underside, where mites reside.
- Rotate products with different modes of action to delay resistance.
Cultural measures complement chemical sprays: maintain adequate humidity (≥60 %), avoid excessive nitrogen fertilization, and prune heavily infested foliage.
Safety considerations include wearing gloves, eye protection, and preventing drift onto non‑target plants or beneficial insects. Store products according to label instructions and discard unused solution after the recommended shelf life.
Consistent monitoring, prompt application of the appropriate spray, and integration of cultural practices constitute an effective strategy for managing spider mite outbreaks.