What helps against spider mite on tomatoes? - briefly
Apply a strong, early spray of neem oil or insecticidal soap, and introduce predatory mites such as Phytoseiulus persimilis to keep populations below damage levels. Maintain moderate humidity and avoid excessive nitrogen fertilization to reduce leaf‑surface conditions that favor the pest.
What helps against spider mite on tomatoes? - in detail
Spider mites thrive in hot, dry conditions and can quickly defoliate tomato plants. Effective management combines cultural, biological, and chemical tactics to keep populations below damaging levels.
Maintain optimal canopy moisture by watering deeply in the early morning and mulching to reduce soil evaporation. A well‑irrigated canopy discourages mite reproduction and promotes leaf surface humidity, which interferes with their feeding.
Introduce natural predators such as Phytoseiulus persimilis, Amblyseius swirskii, or predatory beetles. Release rates of 1–2 predators per square foot at the first sign of infestation provide rapid suppression. Preserve predator habitats by avoiding broad‑spectrum insecticides and planting flowering companions (e.g., dill, sweet alyssum) that supply alternative food sources.
Apply horticultural oils or insecticidal soaps when mite numbers exceed monitoring thresholds (approximately 5 mites per leaf). Spray until runoff, covering the undersides of leaves, and repeat every 5–7 days until populations decline. Use products labeled for tomato use and adhere to pre‑harvest intervals.
If chemical control becomes necessary, select miticides with low resistance risk, such as abamectin or spirotetramat, and rotate modes of action according to label recommendations. Apply at the lowest effective rate, targeting early developmental stages of the mite.
Regular scouting is essential: inspect the lower leaf surfaces with a 10× hand lens twice weekly during peak summer months. Record mite counts and adjust control measures promptly to prevent exponential growth.