What spray to use on plants for spider mites? - briefly
A dilute neem‑oil solution or a commercial insecticidal soap applied thoroughly to leaf undersides effectively controls spider mites. For severe infestations, a horticultural oil spray combined with a low‑toxicity pyrethrin additive can be used.
What spray to use on plants for spider mites? - in detail
Effective control of spider mites requires a spray that contacts all life stages, is safe for the host plant, and fits the grower’s integrated pest management plan.
Broad-spectrum miticides such as abamectin, bifenthrin and spiromesifen act quickly on mobile adults and developing eggs. Use the label‑specified dilution, typically 0.5–1 ml L⁻¹, apply to the underside of foliage, and repeat every 5–7 days until populations drop below economic thresholds.
Horticultural oils (e.g., neem oil, mineral oil formulations) suffocate mites by coating their bodies. Mix 1–2 % oil in water with a non‑ionic surfactant, spray until runoff, and re‑apply weekly during hot, dry periods.
Insecticidal soaps (potassium salts of fatty acids) disrupt mite cell membranes. Prepare a 2–5 % solution, ensure thorough coverage of leaf undersides, and treat every 3–4 days for several cycles.
Botanical extracts such as neem‑based products and rosemary oil provide moderate control while preserving beneficial insects. Apply at the highest recommended concentration, repeat at 7‑day intervals.
Spinosad, a bacterial‑derived insecticide, offers rapid knock‑down of adult mites with limited impact on predatory insects. Use 0.5–1 g L⁻¹, spray to runoff, and limit applications to three per season.
Cultural measures complement chemical sprays: maintain humidity above 50 % to discourage mite reproduction, prune dense foliage to improve air flow, and avoid excessive nitrogen fertilization that promotes rapid leaf growth.
When selecting a product, verify compatibility with any existing biological controls, observe pre‑harvest intervals, and follow personal protective equipment recommendations. Rotating active ingredients with different modes of action reduces resistance development and sustains long‑term efficacy.