What to do if spider mites are found in the garden? - briefly
Inspect the plants, knock mites off with a vigorous water spray, then treat foliage with horticultural oil or neem oil as directed; repeat the application every 5–7 days until the infestation is eradicated.
What to do if spider mites are found in the garden? - in detail
Spider mites reveal themselves as tiny, moving specks on leaves, often leaving a stippled or bronzed discoloration. Confirm their presence by inspecting the undersides of foliage with a magnifying glass; the pests appear as elongated, reddish‑brown bodies, and their fine webbing may be visible.
Immediate measures focus on reducing the population before it spreads. Spray the affected plants with a strong jet of water to dislodge the insects and their webs. Repeat the rinse every two to three days while the infestation persists.
Cultural tactics limit conditions that favor mite development. Remove heavily infested leaves and dispose of them away from the garden. Thin dense plantings to improve air circulation and lower leaf temperature. Water plants in the early morning, allowing foliage to dry quickly and discouraging mite reproduction.
Biological agents provide sustainable control. Introduce predatory mites such as Phytoseiulus persimilis or Neoseiulus californicus; release rates of 10‑20 predators per square foot are effective for moderate infestations. Apply the predators when leaf surfaces are dry and temperatures exceed 65 °F (18 °C) to ensure activity.
If the population remains high, selective miticides may be employed. Choose products based on the active ingredient—abamectin, spirotetramat, or neem oil—and follow label instructions precisely. Rotate chemicals with different modes of action to prevent resistance. Apply at the recommended concentration, covering both leaf surfaces and the underside.
Monitoring continues after treatment. Inspect plants weekly, counting mites per leaf segment; a count below five indicates successful suppression. Record observations to adjust future interventions.
Preventive practices sustain a healthy garden. Encourage diverse plantings to attract natural predators. Maintain adequate soil fertility and avoid excessive nitrogen, which creates tender growth preferred by mites. Use reflective mulches or row covers to deter colonization during peak summer heat.