How to treat a plant for spider mites? - briefly
Apply a miticide such as neem oil or insecticidal soap, covering all leaf surfaces and undersides, and repeat the application every 5‑7 days until mites are gone. Complement chemical control with cultural measures: isolate the plant, raise humidity, and prune heavily infested foliage.
How to treat a plant for spider mites? - in detail
Spider mite infestations require prompt, systematic action to prevent severe damage. Begin with thorough inspection; locate webs and stippled foliage, especially on the undersides of leaves. Early detection allows treatment with minimal disruption.
Identify the affected species and growth stage. Sensitive seedlings may require gentler methods, while mature plants tolerate stronger interventions. Select the appropriate approach from the options below.
• Mechanical removal – rinse plants with a strong jet of water, focusing on leaf undersides; repeat every two to three days until populations decline.
• Cultural controls – increase ambient humidity by misting or grouping plants, reduce excessive heat, and avoid over‑fertilization with high nitrogen, which favors mite reproduction.
• Biological agents – introduce predatory mites such as Phytoseiulus persimilis or Neoseiulus californicus; release rates of 20–30 predators per square foot provide effective suppression. Ensure the predators match the target mite species and temperature range.
• Chemical options – apply horticultural oil (e.g., neem or mineral oil) at a concentration of 1–2 % v/v, covering both leaf surfaces. For resistant populations, rotate to a miticide containing abamectin or spirodiclofen, observing label‑specified pre‑harvest intervals and resistance‑management guidelines.
Monitor treatment efficacy by counting mites per leaf segment. A reduction to fewer than five individuals per leaf after one week indicates successful control. If counts remain high, combine methods: for example, follow oil application with a predator release to address any survivors.
Maintain preventive practices: keep plants well‑ventilated, avoid dust accumulation, and inspect new acquisitions before introduction. Regular scouting and prompt corrective measures minimize the risk of recurring infestations.