How can you fight spider mite on a plum tree? - briefly
Apply horticultural oil or neem oil to foliage, and release predatory mites such as Phytoseiulus persimilis to suppress the pest. Regular monitoring, pruning for better air circulation, and removing heavily infested shoots further limit spider‑mite populations.
How can you fight spider mite on a plum tree? - in detail
Spider mites on plum trees cause stippled leaves, yellowing, and fine webbing. Heavy infestations reduce photosynthesis and fruit quality.
Cultural practices reduce population build‑up. Maintain adequate soil moisture; drought stress favours mite reproduction. Prune crowded branches to improve air circulation and light penetration. Remove fallen leaves and fruit that harbour overwintering stages. Apply a balanced fertilizer, avoiding excessive nitrogen that promotes lush growth preferred by mites.
Mechanical measures provide immediate reduction. Spray foliage with a strong jet of water to dislodge mites and webs. Repeat at weekly intervals during peak activity. Install sticky traps on lower branches to monitor and capture moving adults.
Biological agents target mites without harming beneficial insects. Release predatory phytoseiid mites such as Phytoseiulus persimilis or Neoseiulus californicus according to label instructions. Encourage native predators by planting nectar‑rich companions like dill or fennel near the orchard. Apply microbial products containing Beauveria bassiana when mite numbers exceed economic thresholds.
Chemical options are reserved for severe outbreaks. Select miticides with a short residual life, for example sulfur or neem oil, and apply early in the morning when temperatures are below 25 °C. Rotate active ingredients each season to delay resistance; avoid repeated use of the same mode of action. Observe pre‑harvest intervals and follow local regulations.
Monitoring ensures timely intervention. Inspect leaves weekly from bud break to fruit set, focusing on the underside where mites congregate. Count mites per leaf; action thresholds range from 5 mites per leaf on young foliage to 10 mites per leaf on mature growth. Record observations to adjust treatment schedules.
Preventive steps sustain tree health. Mulch to conserve soil moisture, reduce temperature fluctuations, and suppress weeds that create microhabitats for mites. Implement a regular sanitation program: clean tools, dispose of infested material, and rotate crops when possible. Consistent integration of cultural, mechanical, biological, and chemical tactics maintains low mite populations and protects plum production.