What should be used against a spider mite? - briefly
Apply miticides such as neem oil, insecticidal soap, or horticultural oil, and consider introducing predatory mites (e.g., Phytoseiulus persimilis) for biological control.
What should be used against a spider mite? - in detail
Spider mites require an integrated approach that combines immediate suppression with long‑term prevention.
Chemical options include miticides specifically labeled for spider mite control. Contact agents such as abamectin, bifenthrin, and pyrethrins act quickly but can select for resistant populations if overused. Systemic products like acephate penetrate plant tissue and protect new growth, yet resistance development remains a concern. Always follow label rates and pre‑harvest intervals.
Biological agents provide sustainable reduction. Predatory mites (e.g., Phytoseiulus persimilis, Neoseiulus californicus) consume all life stages of the pest and establish self‑sustaining colonies when environmental conditions are favorable. Entomopathogenic fungi such as Beauveria bassiana infect mites on leaf surfaces, offering additional control in humid environments.
Cultural practices diminish habitat suitability. Maintain adequate plant spacing to improve air circulation and reduce leaf wetness, limiting mite proliferation. Regularly wash foliage with a strong jet of water to dislodge mites and eggs. Avoid excessive nitrogen fertilization, which promotes dense, succulent growth preferred by mites.
Physical methods supplement chemical and biological measures. Sticky traps placed near plant canopies monitor populations and capture wandering adults. In greenhouse settings, introduce screened curtains and insect‑proof screens to prevent ingress of infested plant material.
Resistance management mandates rotation among products with different modes of action. Alternate miticides from separate IRAC groups, interspersed with predatory mite releases and cultural interventions, to delay resistance buildup.
When selecting a control measure, consider crop type, growth stage, residue restrictions, and environmental conditions. Combining at least two complementary tactics—such as a targeted miticide followed by predatory mite release—delivers the most reliable suppression of spider mite infestations.