Wheat powdery mildew is a worldwide disease, which is distributed in all major wheat producing countries. It is common in China's Shandong coastal areas, Sichuan, Guizhou and Yunnan, and it is seriously harmful. In recent years, the disease has become increasingly serious in the northeast, north China, and northwest wheat areas. The specific control measures are as follows:
First, reasonable field management measures. Reasonable close planting, using semi-fine amount of precision sowing, appropriate late sowing, improve plant disease resistance; pay attention to the rational application of nitrogen fertilizer, formula fertilization, timely irrigation and drainage.
Second, biological control. You can choose 1 billion CFU Bacillus subtilis 1000-1500 times solution, spray evenly on the surface of the disease before or during the onset of the disease, according to the growth and disease degree of the crop, increase or decrease the dose, depending on the condition, prevent and cure 2-3 times, the control effect is remarkable .
Third, spray control is carried out at the beginning of the spring. For each acre, use 15% triazolone wettable powder 80-100g or 12.5% ​​diniconazole wettable powder 20-30g, add potassium dihydrogen phosphate 80-100g or chitosan 50g, mix and mix with water 30-45 kilograms of uniform spray, generally spray 1-2 times, can achieve drought resistance, disease prevention, dry heat to improve plant resistance.
Fourth, in the wheat-producing period, spraying 30 μg/ml of paclobutrazol solution per acre can make the plant dwarf, the lodging resistance is enhanced, and the wheat powdery mildew can be cured, and the nitrogen absorption and utilization rate of the plant can be improved.
Fifth, at the heading stage of wheat, when the diseased plant rate reaches 15%-30% or the diseased leaf rate reaches 8%-15%, 15% of the powdery rusting WP can be used per acre or 50% of the rusting emulsifiable concentrate is 40g per acre. Spray 10 kg with water, generally control 1 time to control the disease.
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