4, rice blast disease: In the rain and even Jin, lack of light, improper control of water and fertilizer, too much nitrogen fertilizer and too late to more susceptible to rice blast. Control methods: 4.1 Available 50% rice bran purifying emulsion 500-800 times liquid, spray liquid 50-100 kg per 667 square meters, have better preventive effect. Can also be used 3% rice bran powder, spraying 1-2 kg per 667 square meters, valid for 7 days. 4.2 Usually 40 units of kasugamycin spray 100-200 kg per 667 square meters. 4.3 grams of bulk powder: spray with 40% emulsion 800-1200 times, spray 50-100 kg per 667 square meters or spray 2-4 kg per 667 square meters with 20% powder. Valid for 7 days or so. The above agents are prone to failure under alkaline conditions and should not be mixed with alkaline pesticides. 4.4 Strengthen the management of fertilizers and waters: Fertilizers should grasp the principles of heavy weight in the early stage and light in the later stage. According to the situation of the seedlings, the fertilizer should be used to water and regulate the growth of the rice to prevent leggy. 4.5 Pay attention to the hygiene in the field: Remove the weeds in the trenches and fields in time to keep the rice fields clean to reduce the source of the disease. 5, Peanut brown spot: Peanut brown spot, defoliation, generally years, 10% -20%, in severe years, up to 30%. The main damage to peanut leaves, initially small, later expanded into a nearly round or irregular shaped spots, lesions are larger and darker than the black spot, the leaves are dark brown or tea brown, brown or yellow brown on the back. There is a bright yellow halo around the lesion. When the humidity is high, a gray-brown moldy layer can be seen on the lesion. Petioles and stems infected, lesions oblong, dark brown. The growth and development temperature of the bacteria ranged from 10-33 degrees, and the optimum temperature was 25-28 degrees Celsius. The climate is heavy with wet and humid. The onset of the disease is earlier, and the young leaves are more severe than the old leaves. The methods of prevention and control are: 5.1 Advocate the use of composted compost or decomposed organic fertilizer. The use of formula fertilization technology, increase phosphorus and potassium fertilizer. 5.2 Strengthen field management. 5.3 Spray 70% thiophanate-methyl WP 1000 times or 50% Benzophenone Wettable Powder 1500 times, 50% Carbendazim WP 900-1000 times, 70% Chlorothalonil wettable powder 600-800 times, 40% chlorothalonil suspension 600 times, 80% spray WP 600 times liquid. 70% Mancozeb Zinc Wettable powder 200 times, should add 0.2% detergent powder when spraying, control once every 15-20 days, even 2-3 times. The above-mentioned agents can be used interchangeably to improve the control effect.
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