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Second, prevention and control measures
1. Increase phosphorus and potassic fertilizers in order to enhance plant resistance to disease in case of fertilizer deficiency and poor growth.
2, clear the sick leaves ventilation and humidity. The severely diseased leaves in the lower part of the plant should be removed in a timely manner and put in a plastic bag to be burnt or buried under the soil. The diseased leaves must not be randomly thrown, otherwise it is easy to cause the spread of germs and increase the incidence. The humidity in the greenhouse must be promptly ventilated to reduce the humidity and temperature so as not to spread the germs.
3, chemical control. Should be used as soon as possible in the early stage of powdery mildew to control the spread and spread of the disease. Control per acre can be used 15% triadimefon 1500 times mu or 12.5% ​​wolfberry fruit wet WP 22.5-25 grams or 37.5% powder WP WP 100 g water 50 kg aligned on both sides of the blade spray. After medication 7-10 days once, once every 2-3 times.
The Powdery Mildew Prevention Techniques of Vegetables, Fruits and Soya Beans
I. Symptoms of powdery mildew are mainly on leaf disease, with petiole, stem and fruit less. The diseased site produces a white, near garden-shaped, small pink spot that spreads into the surrounding area and forms a white powder. This is a pathogen, which occurs first at the base of the leaf, then spreads upward and around, and leaves the diseased leaves gray and yellowish brown. .