After entering the rainy season, the number of rainy days increased in most areas of our province, and the number of sunshine hours dropped sharply, which provided favorable meteorological conditions for the occurrence, development, and spread of rice blast disease. Please pay close attention to the census of rice fields, preparation of pharmaceuticals, and active prevention and control. Rice blast disease source analysis Rice blast is a rice disease that is caused by infection and infestation of pathogens, and has the greatest impact on the yield of rice spikes. Seed carriers and diseased rice straw are the major sources of rice blast disease. Rice is susceptible during different growth periods, resulting in different symptoms. It is generally divided into: rice seedlings, leaf rice seedlings, rice seedlings, ear stem pods, branch stem pods, and grain pods. From weather conditions analysis Continuous precipitation, more rainy days, lack of light, low temperatures, and high air humidity are all conducive to inducing or promoting the development of rice blast, as well as widespread spread. In addition, partial application of nitrogen fertilizer, especially after the jointing stage of rice partial nitrogen fertilizer, resulting in greed, leggy; long-term submerged deep water, etc., are conducive to the breeding of bacteria invasion, resulting in large-scale hazards. Current climate characteristics Since June, due to the combined effects of the cold air from the north and the warm and wet southwest wind, precipitation days and rainfall in most areas of our province have increased significantly compared with the previous period. Due to the number of rainy days, the number of sunshine hours has dropped sharply. According to the statistics, from June 1 to June 30, the number of medium-rain rains in our province was 562, heavy rains were 227, and heavy rains were 69. The average monthly rainfall days for each station in the province was 17.8 days. Jinping up to 25 days, Lijiang, Green Spring 24 days, most of the area is 16-20 days; sunshine hours in the province an average of 127.3 hours, less than the same period in the calendar year over 5.4%, 23% of the province's stations are less 56-100 hours, 60% of the stations are less than the average over the calendar year. Control methods Please inspect the paddy fields in a timely manner. If rice blast or rice blast disease has become prevalent, it is necessary to pay close attention to the time and spray pesticides in a timely manner. 1. Available "20% tricyclazole wettable powder" 1000 times, 50-75 grams per acre dose. This is a kind of prophylactic bactericide with long-acting, high-efficiency, and long-lasting residual effect. It needs to be applied before the infection of pathogens, and it can also treat panicle blight. 2. "40% rice bran (Fuji-1) EC" 1000 times, 57-72 ml per acre, the drug has a systemic absorption, a long residual period, it needs to be applied before the onset, and can treat both Nuclear disease, Sclerotinia and cloudiness. 3. "50% carbendazim can be wettable powder" 1000 times, 75-100 grams per acre, can cure sheath blight, Pediococcus disease and rice narrow stripe spot disease.
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