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First, the prevention and control strategies and objectives are based on the promotion of disease-resistant varieties, with the focus on the prevention and control of seed potato treatment and chemical emergency protection, and the comprehensive prevention and control technology supplemented by fitness cultivation, and vigorously promote professional and unified defense technology. Efforts should be made to limit the rate of damage caused by potato late blight to less than 10%.
Second, the main prevention and control technology (a) seed processing technology to promote the sowing of small whole potatoes. When the seed cuttings are sown, the cutting knife is soaked with 75% alcohol, 0.1% potassium permanganate solution or formalin. Seed dressing can be used 68% refined metalaxyl MnZn wettable powder, 72% cream urea manganese zinc WP and other agents, according to 0.3% of seed potato weight plus appropriate amount of plant ash or gypsum powder mixed evenly after dressing.
(b) High-ridge cultivation techniques promote high-ridge cultivation, especially in areas with high rainfall and good sensation. The method of ridging on a ridge and ridging after flat sowing can be adopted to reduce the bacterium tuberization rate.
(c) The cultivation and disease prevention techniques are closely planted and the budding period is controlled. Timely sowing, reasonable rotation, avoiding continuous cropping or interplanting with Solanaceae, cruciferous crops, and prohibiting continuous cropping with tomatoes.
(IV) Chemical Control Techniques Potatoes undergo pre-emergence or precipitation (cloudy humidity) and carry out surveys of central diseased plants, surveys of fixed-point systems, and large-scale surveys in the fields. It was found that the central diseased plants were cleared in time and brought out of the plots for destruction. The spray was applied within 50 meters around the strain to control the blockage, sprayed once every 7-10 days, and sprayed 3-4 times. After entering the budding period, a field survey was conducted and the central diseased field was found to contain systemic fungicides, such as metalaxyl, propamocarb, methionylmorpholine, fluopyram, etc. Drug control, adhere to alternating use of agents. From the bud to the initial stage of flowering, two protective fungicides, such as mancozeb, propylenzinc, dinynoxazone, chlorothalonil, etc., were sprayed before the onset of continuous rain.
(5) Disease prevention techniques during harvest and storage The potato was killed one week before the harvest, and the stems and leaves were removed from the plot and disposed outside. Choose sunny harvest to avoid skin injuries. Remove the diseased potato and wounded potato pieces before entering the pit, and store them in a cool, ventilated place for 3 days. Pre-storage fumigation with storage of sulphur with sulfur can also be used 15% Pythium chlorothalonil compound smoke agent or 45% bacteriostatic clearing agent. The storage capacity is controlled within 2/3 of the storage cellar capacity. Increase ventilation during storage, temperature not lower than 4°C, humidity not higher than 75%.
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2011 Potato Late Blight Prevention and Control Technology Program
Potato late blight is a pandemic and devastating disease and has become a major factor restricting the healthy development of the potato industry. In order to effectively control potato late blight, the plan was formulated.