Garden pest
Spider mites
Fine webbing and pale stippling that flare up in hot, dry spells.
Spider mites is in its active season now — scout your plants this week.
How to identify spider mites
Spider mites are not insects — they are tiny arachnids, smaller than a pinhead, in yellow-green to reddish colors. Individually they are almost invisible; you spot them by the fine webbing and the pale, speckled leaves.
Tap a suspect leaf over white paper and watch for slow-moving specks. Delicate webbing on the undersides of leaves and at the shoot tips confirms it.
Attacks: Beans, Tomatoes, Eggplant, Cucumbers, Many herbs
Life cycle: Mites breed explosively in hot, dry, dusty conditions, completing a generation in under a week, so a light population becomes an infestation fast; they are worst on drought-stressed plants.
Signs of spider mites
What you actually see on the plant — usually before you spot the pest itself.
- Fine pale stippling that gives leaves a sandblasted, speckled look
- Bronzing or yellowing leaves that dry and drop as feeding builds
- Delicate webbing on leaf undersides and at the shoot tips
- Damage worst on hot, dry, dusty, or drought-stressed plants
Organic control, least-toxic first
Start at the top and only move down if you need to. Physical and cultural fixes come before any spray.
- Blast the undersides with water
A strong spray of water aimed at the undersides of the leaves knocks mites loose and, just as important, breaks the hot dry conditions they need. Repeat every few days and light cases often clear on this alone.
- Keep plants watered and unstressed
Mites pile onto drought-stressed plants. Steady watering and a little mulch to cut dust keeps plants vigorous and far less inviting.
- Bring in predatory mites
Predatory mites are a natural enemy you can release; they hunt spider mites without harming the plant and can hold an outbreak in check on their own.
- Spray insecticidal soap, horticultural oil, or neem
A registered insecticidal soap, horticultural oil, or neem smothers mites on contact. Coat the undersides of the leaves thoroughly, reapply on the label's schedule since eggs keep hatching, and follow the product label.
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One rule for any product you spray: follow the label. The label is the law, and it is the tested, safe rate for your plants — homemade mixes and dish-soap sprays are not, and can scorch foliage.
Prevent it next season
- Water consistently and mulch to keep plants unstressed and cut down on dust
- Rinse the undersides of leaves in hot dry spells before mites ever build up
- Avoid broad-spectrum insecticides, which kill the predators that keep mites in check and can make an outbreak far worse
Questions about spider mites
Are spider mites insects?+
No — they are tiny arachnids, more closely related to spiders. That is why some insecticides do not touch them, and why a water blast plus insecticidal soap or horticultural oil is the reliable fix.
What is the fine webbing on my bean leaves?+
Spider mites. They spin delicate webbing on leaf undersides and shoot tips while their feeding leaves pale, speckled, bronzing leaves. They flare up in hot, dry, dusty spells.
Why did my spider mites get worse after I sprayed?+
Broad-spectrum insecticides kill the predators that keep mites down, so mites often rebound harder. Stick to a water blast, predatory mites, and a registered insecticidal soap, horticultural oil, or neem.
Plan a garden that fights back
Healthy, well-spaced plants shrug off pests that flatten a crowded bed. PlotToTable sizes your beds, spaces every crop, and flags the pests that hit what you grow.