Identification and Prevention of Rice Blast
Rice blast is also called rice fever. It can occur during the entire growth period of rice, with the largest influence of leafhoppers and ear blasts. The leafhoppers mainly occur in the four-leaf stage and the tillering stage of the seedlings. Common lesions are acute and chronic. The acute lesions are oval in shape, with dark green water spots, and a large number of gray-green moldy conidia are on the back, which is a sign of disease prevalence. Spindles with chronic lesions, when the humidity is high, the back of the lesion can also produce gray green mold, indicating that the disease may spread. The frugality makes the rice section black and the stems easily broken. The incidence of panicle neck is panicle blast (can also be affected on the rachis and branches), the lesions are brownish to dark brown, the panicle head disease develops as early as white panicles, the late panicle valleys increase, and the grain weight is reduced. Grain pods appear as brown spots or pale to dark gray spots on the grains and are a fungal disease. The pathogenic bacteria wintered on diseased straw and grain. The bacteria on the haystack can survive for more than 1 year. It will produce spores when wet and rain and spread with wind and rain. When the temperature is 25°C-28°C, it is warm and rainy, lacks of sunshine, low temperature and raininess at the earring stage, improper management of fertilizer and water, and it is also a plant susceptible variety, and it is most susceptible to disease.
The key to controlling rice blast is rational use of medicine. On the basis of doing a good job of predicting and forecasting, we must seize the prevention and control of drugs for appropriate period of time. The ideal pesticides for controlling rice blast are Fuji No. 1 40% emulsion and tricyclazole 20% wettable powder, each of which uses 50 grams to 100 grams of water and 100 kilograms of water per acre.
Rice booting to heading, rainy weather. In addition, 1% of the rice plants had lesions on the flag leaf, and they should be controlled and used for 1 time in the booting and heading stages, respectively. When applying pesticides, ensure that the amount of liquid used for mu is not less than 100 kg, so as to spray evenly to prevent leakage. The upper and lower parts of the seedlings and the front and back sides of the leaves must be sprayed to the liquid.
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