Rice blast is a biological natural disaster, also known as rice cancer. According to statistics, China suffers from 7% to 9% reduction in rice blast disease every year. Our province has severely reduced production by 20% to 30%. The figures are alarming. In order to prevent rice blast, breeders have adopted various methods to breed disease-resistant varieties as the primary measures for controlling rice blast. However, there is no absolute disease-resistant variety. With the change of climatic conditions, rice disease resistance and rice blast fungus (genus fungal disease) are mutually selected. What if I get contracted with rice blast? In general data is chemical control, Fuji 1500 per 1500 ml, 600 kg water spray, but most of the effect is not good, the reason is that there is no correct method of application, I found a new law in rice cultivation for many years, The effective methods for the prevention and control of rice blast by pharmaceutical agents were introduced to the majority of farmers. The occurrence of rice blast disease is mostly a season of high temperature and high temperature. It is not enough to explain the application time of pesticide application methods in various varieties of rice blast. It often results in poor efficacy. At present, there are about 15 kilograms of sprayers in China. Each mu of land must have sufficient liquids. In principle, no less than three sprayers should be sprayed. The spray should be sprayed upward from the bottom of the rice plant instead of the sprayer. The walking direction should be backwards. The direction, because the person left the sprayed liquid has been scraped off. After 3:00 pm, it is not possible to prevent the decomposition of high-temperature liquids in the morning, coupled with the propagation of rice blast pathogens in the evening and breeding at night. Also, rice blast pathogens grow from the back of the leaves. These are very important points. From the cultivation point of view, we must strictly control the amount of nitrogen fertilizer. To avoid excessive irrigation and long-term lack of water are prerequisites for the occurrence of rice blast. Under such conditions, attention should be paid to observation, and if measures are taken to prevent and treat it in time. Grass ash can control the occurrence of rice blast. The main component of plant ash is K20, with a dosage of 50 kg per acre. In the early evening and in the morning when there is dew, the mechanism of controlling the disease by direct spreading to the field directly by hand occurs. Sticking grassy ash on rice leaves protects the surface cells of the leaves. To close the leaf stomata and enhance the mechanical properties of the leaves is not conducive to the growth of mycelia of rice blast and the spread of robes. At the same time, plant ash can be absorbed by rice plants, increasing potash fertilizer, and facilitating crop growth. The prevention of panicle stemming is particularly important. It is known from many years of production practice that daily observations should be made. According to the disease resistance of the varieties, the climatic conditions in the current year should be used to calculate the panicle stage. Be sure to apply the pesticide 7 days before the heading date, because rice has the weakest resistance at this time, rice blast invades until it develops into a disease state for 7 days, and once again at the heading stage, the pesticide is applied according to the above method to ensure good results. !
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