How can spider mite on plants be combated? - briefly
Apply horticultural or neem oil and introduce predatory mites (e.g., Phytoseiulus persimilis) to reduce populations. Maintain low humidity, rinse leaves frequently, and rotate miticides to avoid resistance.
How can spider mite on plants be combated? - in detail
Spider mites cause stippling, yellowing, and leaf drop by feeding on plant sap. Early detection relies on inspecting the undersides of foliage for tiny moving specks and webbing.
Cultural practices reduce population buildup. Remove plant debris, prune heavily infested shoots, and maintain adequate spacing to improve air flow. Increase humidity through misting or bottom‑watering, as dry conditions favor mite reproduction. Select varieties with documented resistance and avoid excessive nitrogen fertilization, which creates tender growth preferred by the pest.
Physical tactics interrupt feeding and remove insects directly. A strong jet of water dislodges mites from leaf surfaces; repeat applications prevent recolonization. Hand‑remove webs and heavily infested leaves. Sticky cards placed near canopy edges capture wandering adults.
Biological agents suppress mites without chemical residues. Predatory mite species such as Phytoseiulus persimilis, Neoseiulus californicus, and Amblyseius spp. establish quickly on crops and consume large numbers of prey. Lady beetle larvae, predatory thrips, and lacewing adults provide supplemental control. Entomopathogenic fungi like Beauveria bassiana infect and kill mites when applied as a foliar spray.
Chemical options are reserved for severe outbreaks. Miticides containing abamectin, spiromesifen, or bifenthrin act quickly but must be rotated to avoid resistance. Neem oil and potassium salts of fatty acids offer broad‑spectrum activity with lower toxicity. Follow label rates, apply to both leaf surfaces, and observe pre‑harvest intervals.
Effective management integrates all measures. Scout plants weekly, recording mite counts per leaf and noting environmental conditions. Apply interventions when populations exceed established thresholds (e.g., >5 mites per leaf). Combine cultural, mechanical, biological, and, if necessary, chemical controls to maintain low pest pressure while preserving plant health.