How to prevent pumpkin powdery mildew

Pumpkin powdery mildew can occur from the seedling stage to the mature stage, and it is heavier to damage in the middle and late stages of growth. The main infested leaves, petioles and stems also have pathogenesis. On the two sides of the early leaves, there were nearly round white powdery mildew spots. The number of foliage was more, and then gradually enlarged. The white spots became large pieces. When the disease was severe, the entire leaves were covered with white powder. The leaf tissue below the white powder was light yellow. After turning brown, later turned gray, leaves dry and curled. Symptoms of petiole and tender stems are similar to those of diseased leaves but less flour. Incidence conditions: pumpkin powdery mildew in the high temperature and humidity and high temperature dry alternately when the incidence peaked at the same time in the urea and other nitrogen fertilizer application more densely planted, damp fields are susceptible to disease or severe disease. After the end of production, the pathogens overwintered on the old strains and sicknesses. Comprehensive prevention and control: (1) Selection of disease-resistant improved varieties. At present, more Japanese scented squash, kumquat squash, and orange and red squash have a certain degree of disease resistance, but they must do a good job of purification and rejuvenation, and use disease-free seedlings. (2) Seed disinfection: sowing in the sun for 1-2 days before sowing, to kill epidermis miscellaneous bacteria, increase the germination potential; soaking with warm water at 50 °C -55 °C soak for 30 minutes, the temperature is reduced to 30 °C to continue soaking 8 - 10 hours, and then placed in 1% potassium permanganate solution disinfection 20-30 minutes, rinsed at 28 °C -30 °C under the germination of 48-72 hours, when the dew white sowing. (3) Strengthen management and rational fertilization: It is best to practice crop rotation for 2-3 years with grass crops. Mu Shi fermented farmyard fertilizer 5000-7000 kilograms, ternary compound fertilizer 20 kilograms, potassium chloride 15 kilograms, urea 5 kilograms. Extending vines generally do not top-dressing, fruit enlargement period per kilogram of potassium sulfate compound fertilizer 20 kilograms, and keep the soil moist, clear water drainage after the rain. Timely removal of basal diseases, old yellow leaves, and deep or concentrated burning. Strengthen ventilation and light in the field, enhance plant resistance. (4) Foliar spraying protective film: before or at the beginning of the disease, spray with 99.1% of the enemy and 300-500 times liquid on the leaves to form a protective film, spray once every 5-7 days, continuous spraying 2-3 times. (5) Chemical control: In late April-July, the drug is controlled at a proper time. Before the occurrence of the disease, 53.8% can be used to kill 2000 type 1000 times fluid. In the early stage of disease, it is possible to use 10% Shigao 1500 times, or 40% Fuxing 8000x, or 43% Prec 5000x, or 12.5% ​​Subao 2000x, or 2% plus 600x for spraying. Spray every 7-10 days, continuous spraying 2-4 times. You can also use baking soda 600 times to control, spray on the individual leaves when there are 1-2 lesions, spray once every 3-4 days, continuous spray 4-6 times. Baking soda can not only prevent diseases, but also promote growth, and increase pumpkin production by 10-20%. When spraying, use a small-diameter jet to reduce the surface humidity of the blade.

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