Potato late blight has a fast onset, short course of disease and heavy damage. It is necessary to effectively control its damage through comprehensive prevention and control measures.
Promoting disease-resistant virus-free seed potatoes Based on the monitoring of disease resistance of field potato varieties, select resistant varieties to produce virus-free seed potatoes, and vigorously promote the use of first-grade virus-free seed potatoes for the production of commodity potatoes, and at the same time, make a good Potato processing. When the potato is eliminated, the potato is eliminated and the cutting knife is soaked with alcohol or potassium permanganate solution or formalin; the seed block may be selected from the metalaxyl wettable powder or creamurea. Manganese zinc wettable powder and other chemical seed dressing, dry farming area can also be used for potato seed soaking agent (such as compound micro-fertilizer rare earth dryland treasure, etc.) plus metalaxyl manganese zinc wettable powder soaking, mixing and soaking seeds need to avoid light Allow to sow 2 hours above drying.
Fitness cultivation emphasizes the promotion of high-ridge cultivation, reasonable dense planting, timely planting, scientific rotation and other fitness training measures, especially in places where there is a lot of rain and good sensation, ridging on a ridge and ridging after flat sowing can be adopted to reduce the bacterial growth rate of tubers. Avoid rotation or interplanting with Solanaceae and Cruciferae crops and prohibit rotation with tomatoes.
The central disease strain treatment strengthens the investigation. When the central diseased plant is found, all the roots and seeded potato chips are dug out and taken out of the field and buried deeply. The depth is more than 1 meter. The diseased hole is disinfected with lime, and the diseased plant is 50 meters around. Internal spraying methothene manganese zinc or cream urea manganese zinc and other agents to block control, spray once every 10 days, and even spray three times to prevent disease expansion.
Pharmaceutics control after disease budding strengthens fixed-point monitoring and field census. From budding to early flowering, spray 1~2 times of protective bactericide, such as mancozeb (fully-complexed state), Propylene Zinc, before the onset of continuous rain. Prophylaxis with propynylcarbamate, etc.; after field disease, the recurrent zone is immediately given a systemic fungicide, such as metalaxyl, propamocarb, dimethomorph, manganese zinc, fluopicocarb, and downy mildew Wei and other pharmaceutical spray control 2 to 4 times, often and occasionally use the above-mentioned agents to monitor and predict the use of the above-mentioned agents to prevent or treat 1 to 3 times, or for the prevention and treatment of Bisagenta, Bacillus subtilis and other biological agents. The sprayer strives for evenness. If the rain falls 6 hours after spraying, make up the spray in time. Special emphasis should be placed on rotating medications.
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