Rice blast is more common during the growth of rice, causing serious damage, and even severe plots appear to have falling nests, resulting in reduced yields. The reasons for the occurrence of rice blast are as follows: 1. Climatic conditions: Rainy weather is more, the temperature is above 20°C, the humidity in the field is above 90%, and the surface water film of rice plants remains 6 to 10 hours. Rice blast disease is prone to occur. 2. It is related to the disease resistance of some varieties: Some rice varieties have low disease resistance and are difficult to adapt to the local climate, soil and water conditions, and are also prone to disease. 3, excessive partial nitrogen fertilizer: excessive partial nitrogen fertilizer, easily lead to young or leggy plants, plant resistance to disease weakened, the bacteria so easy to invade, easy to cause rice blast disease. At the same time, over-application of nitrogenous fertilizers may lead to unbalanced individuals and populations of rice and canopy closure, creating a local environment for the reproduction of pathogens. The plot where the nesting phenomenon occurs is the excessive application of nitrogenous fertilizer.
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