How to kill a spider mite on a plant? - briefly
Apply a miticide or a thorough spray of insecticidal soap, covering all leaf surfaces to remove the pests. For sustainable control, release predatory mites such as Phytoseiulus persimilis to keep the population in check.
How to kill a spider mite on a plant? - in detail
Spider mites are tiny arachnids that feed on plant sap, causing stippling, yellowing, and webbing. Effective control requires a combination of cultural, mechanical, biological, and chemical measures.
First, isolate the affected plant to prevent spread. Remove heavily infested leaves and dispose of them away from the growing area. Wash the plant with a strong stream of water, focusing on the undersides of leaves where mites congregate; this dislodges many individuals and reduces population density.
Next, introduce natural enemies. Predatory mites (e.g., Phytoseiulus persimilis, Neoseiulus californicus) and insects such as lady beetles or lacewings consume spider mites and reproduce quickly. Release them according to the manufacturer’s recommendations, ensuring the plant environment remains humid and free of broad‑spectrum insecticides that could harm them.
If biological agents are unavailable, apply approved miticides. Select products containing sulfur, neem oil, or horticultural oil and follow label directions precisely. Apply the spray in the early morning or late evening, covering the leaf surface and undersides thoroughly. Repeat applications at 5‑7‑day intervals until no mites are observed, then discontinue to avoid resistance buildup.
Cultural practices reinforce all other methods. Maintain optimal watering to keep plants well‑hydrated, as stressed vegetation is more vulnerable. Increase ambient humidity (60‑70 %) by misting or using a humidifier; spider mites thrive in dry conditions. Prune overcrowded foliage to improve air circulation and light penetration, which discourages mite development.
For severe infestations, a short‑term systemic insecticide may be necessary. Choose a product labeled for spider mite control, apply at the recommended rate, and observe a mandatory pre‑harvest interval if the plant is edible.
Finally, monitor regularly. Inspect leaves every 2‑3 days using a hand lens or magnifying glass. Record mite counts and adjust control tactics accordingly. Consistent observation combined with the integrated steps above provides reliable eradication of spider mites from any plant.