According to the information of the plant protection station of Heilongjiang Province, based on the recent field monitoring surveys and cultivation and meteorological conditions in the province, it is expected that the potato late blight in this province will reach a certain degree of occurrence this year, and the peak incidence will be in late July. Mid-August.
At present, most of the main potato varieties have poor disease resistance. For example, early Dabai, Youjin, Kexin 13, Yanshu 4, Dongnong 303 and other varieties have a relatively high incidence in recent years, and the field is rich in bacteria, which is conducive to disease prevalence. The onset of the onset is close to normal. On June 24th, Mishan began to see the central disease plant in the field. On August 1st and July 3rd, Bei'an and Boli saw the central disease plant in the field, Fujin, Aihui, Shuangcheng, Muling and other places have recently seen the disease in the field, and the onset of the disease is close to normal years. Other counties and cities have not yet seen the disease. At present, the average disease rate of the diseased plots is less than 1%, and the lesions mostly occur in the lower leaves.
Recently, the province has many high-temperature and low-rain weather. According to the forecast of the provincial meteorological department, the average precipitation in the province was slightly less in July, and the average temperature was slightly higher. However, July and August are the concentrated period of rainfall in the province, and it is the period of potato late blight, which is conducive to the epidemic.
In summary, it is expected that this year's potato late blight will be more serious than last year, and most of the main potato producing areas will be heavier. It is necessary to strengthen the prevention and control of potato late blight and prevent spraying early.
Prevention and treatment recommendations: 1. Central disease plant treatment. When the diseased plant of the late potato disease center is found, the potato pieces should be dug out all the way, brought out of the field for deep burial or destruction, and sprayed with cream urea, manganese zinc or fluopyramine within 50 meters around the diseased plant. Blocking control such as downy mildew.
2. Conduct field chemical control in a timely manner. More rainfall, even rainy days, temperature 18 ° C ~ 22 ° C, relative humidity of more than 90%, susceptible varieties of field should increase the number of applications, the application interval between 5 days ~ 7 days. Therapeutic agents should be used in combination with protective agents, and agents of the same type of mechanism of action cannot be used continuously to delay the development of drug resistance. Biopharmaceuticals can use 100 billion live spores/gram of Bacillus subtilis wettable powder, and chemical agents recommend 50% flumorpholine·manganese zinc wettable powder, 20% flumorpholine wettable powder, 25% flurazepam Suspending agent, 687.5 g / liter of fluorobacteria · downy mildew suspension. Under normal circumstances, if the rain occurs within 8 hours after spraying, it should be refilled in time. Spraying should be strictly in accordance with the "Pesticide Safety Operating Procedures".
3. Prevention of tuber disease before harvest. The potato was killed 2 weeks before the harvest, and the stems and leaves were cleaned out of the field for centralized treatment. After the killing, spray the frost urea, manganese zinc or ether oxystrobin on the surface to prevent tuber disease, and choose sunny harvest. (Yi Xun)
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