North to prevent potato late blight

    Agricultural Herald News (Reporter Wang Zhaoyong) Recently, the reporter from the National Agricultural Pest Forecasting Center was informed by the climate, the impact resistance and poor variety of factors, northeast, north, northwest incidence of potato late blight earlier this year, as of August 1 A total of 9.018 million mu was generated , an increase of 22% over the same period of the previous year . The weather conditions in August are conducive to the epidemic of potato late blight, and the main producing areas are biased to the pandemic.

    It is understood that potato late blight is a typical climatic and epidemic disease. Since July this year , affected by factors such as heavy rain, high humidity in the field, and poor resistance of varieties, potato late blight has occurred early and spread rapidly, and it has been widespread in the main producing areas of northern China. As of August 1, Gansu, Shaanxi, Inner Mongolia, Hebei, Shanxi, Ningxia, Heilongjiang, Liaoning, Jilin and other provinces (regions) cumulative incidence of 901.8 acres, an increase of 22% over the same period last year.

    There were 3.559 million mu in Gansu Province, an increase of 189.3% over the same period last year . The average disease rate of the affected field was 16.3% . The average morbidity rate of Qingshui, Zhangchuan, Tongyu, Suichang and other counties was 61.5% ~ 86.2% , the disease rate was 19.2%~50.5% , and the disease rate of Qingshui County was 32.3% , which was heavier than last year. A total of 611,000 mu of forests occurred in Shaanxi Province . The average disease rate of Datian, Jingbian, Fugu, Jude and other counties in Yulin City is 5%~68% , of which Jingbian County has a disease rate of 68% and a disease index of 7.0 ; Yan'an City is sporadic. There are 187,000 mu in Ningxia Autonomous Region . The disease spreads rapidly. The individual early-maturing varieties in the Yuanzhou District of Guyuan City are only 3 to 5 days from the time of the disease to the general occurrence . The rate of diseased plants in the field is generally 1% , the disease index is 0.75 , and the disease rate of the disease center is 80% .

    There were 1.577 million mu in Shanxi Province . According to the Datong City survey, the rate of diseased land in Pingchuan is 85% , the rate of diseased plants is 55% , the rate of diseased leaves is 35% to 40% , the rate of diseased land in hilly areas is generally 30% , the rate of diseased plants is 10% to 15% , and the rate of diseased leaves is generally It is 10% . There are 1.07 million mu in Hebei Province . According to Chengde City, the average disease rate of the affected plots is 10%~15% , and the highest disease rate is 35% . The scattered planting plots are serious.

    There are 576,000 mu in Inner Mongolia Autonomous Region . The Hulun Buir City Zalantun July 29 survey, 23% of diseased plants, diseased leaves an average rate of 10%, up 90%; Xilin Gol League July 21 survey, the incidence rate is generally 10%, Taipusiqi retransmission Lot more than 15%; Ordos City Wushenqi investigation July 24, strain rate of 100%, diseased leaves 10% to 20%. Heilongjiang Province has a total area of 768,000 mu. The average disease rate of Qiqihar, Daxing'anling and Harbin is 1.5%~8.2% .

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    According to the prediction of the National Climate Center, precipitation in eastern Inner Mongolia, the northeastern part of China, the northeastern part of China, and the southeastern part of the northwestern region in August is more than normal. In the next 10 days, more obvious rainfall will occur in the eastern, northern and northeastern regions of the northwestern region. Conducive to the epidemic of potato late blight.

    Currently, potatoes are in a susceptible period. In response to the severe situation of potato late blight recurrence, agricultural plant protection departments at all levels should attach great importance to strengthening monitoring, pay close attention to local weather trends, timely issue disease warnings, scientifically guide prevention and control, and minimize the occurrence and harm of late blight.