Pest biology, identification, and foliar feeding symptoms
Red spider mites multiply rapidly under warm, dry conditions, developing through egg, larva, protonymph, deutonymph, and adult stages.
- Identification: Oval, reddish-brown to greenish bodies barely 0.5 mm long, congregating on the undersides of leaves.
- Stippling damage: Piercing-sucking mouthparts puncture leaf cells, creating fine yellow or white speckled dots (stipples).
- Silky webbing: Dense colonies spin protective fine silk webbing over shoot tips and leaf undersides, trapping dust and shielding eggs.
- Severe injury: Leaves turn bronze or paper-brown, curl downward, and drop prematurely, causing stunted growth and severe fruit yield loss.
Vulnerable host crops and favourable weather dynamics
Red spider mites attack a wide range of open-field and protected polyhouse crops during hot, dry spells.
- Commercial vegetables: Severe infestations in chilli, tomato, brinjal, okra, and polyhouse capsicum.
- Commercial floriculture: Major economic threat in greenhouse roses, carnations, and gerberas.
- Cash and plantation crops: Attacks cotton, tea, soybean, and papaya during pre-monsoon and post-monsoon dry windows.
- Weather triggers: Warm temperatures (above 30 degrees Celsius) and low relative humidity accelerate life cycles to under 7 to 10 days.
Integrated pest management (IPM) and selective acaricides
Avoid excessive broad-spectrum pyrethroid sprays, which eliminate natural predatory phytoseiid mites. Spray botanical neem oil (1500 to 10,000 ppm) with a suitable emulsifier during early population build-up. Under heavy mite pressure, rotate selective registered acaricides such as Spiromesifen 22.9% SC, Fenpyroximate 5% EC, or Propargite 57% EC, ensuring thorough coverage of leaf undersides.
Official source
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Indian Council of Agricultural Research (ICAR) ↗Related on KisanPe
Common questions
How can a farmer detect red spider mite infestation early?
Check the underside of leaves with a magnifying lens for tiny reddish mites, fine silky webbing, and yellow stippling dots on the upper leaf surface.
Why do red spider mite populations explode in hot, dry weather?
Warm temperatures drastically shorten the mite life cycle from egg to adult to under a week, while dry conditions stress crops and suppress fungal pathogens.
Which chemical acaricides are registered for managing red spider mites?
Approved acaricides include Spiromesifen 22.9% SC, Fenpyroximate 5% EC, Diafenthiuron 50% WP, and Propargite 57% EC.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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