How to prevent and treat rice with panicle blast
Q: Ou Duoyu, Maba Town, Pixian County: Last year, the output of Fengliang Youxiang No. 1 was well-received. However, a small amount of panicle blast occurred in the field. Considering that bacteria may be present in the field, should this year be changed when rice is selected? Answer: The rice blast pathogen mainly overwinters with mycelia or conidia on the diseased and diseased rice straw, becoming the source of infestation in the early next year. When dried, the conidia can survive for six months to one year. The mycelia in the diseased tissue can survive for more than one year; when it is wet, it will die after two to three months. The reason for the occurrence of panicle blast in rice is first of all to have a sufficient source of bacteria, but the most important factor is the climatic conditions during the flowering period. If there is more rainfall and more humidity during the flowering season, the temperature will drop below 20°C for a week or so, and the bacteria will easily invade and cause the disease. At present, rice varieties used in production are not very resistant to panicle blast, but the selection of varieties with relatively good resistance to panicle blast is beneficial to reducing the occurrence of panicle blast. The most important measure for the prevention and control of panicle blast is the prevention of drug use at the heading stage of rice breaks. The source of bacteria that usually occurs during the earing stage is mainly from leafhoppers, so it is necessary to control the leafhopper epidemic. In the early stage of leaf blast, the pesticide was applied to control the onset of the disease, and the surrounding rice plants or paddy fields were protected by pesticides. Thereafter, the number of application times was decided according to the development of the disease and the change of the weather. Generally can be applied once every 3-5 days, a total of 1-2 times. Micamid and other drugs are used for seed treatment before sowing to kill the rice blast fungus that the seeds carry.
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