Temperature and climatic pests and diseases are common climatic pests and diseases , and understanding the impact of the disease can better prevent and control in advance.
Rice blast is moderately prevalent in the southwestern, southern China, the middle and lower reaches of the Yangtze River and the northeastern Changfa area. The area of ​​susceptible varieties in the southwest and northeastern areas is likely to be prevalent, with an area of ​​80 million mu.
Wheat scab is a moderate threat in the eastern Hubei and Jianghan plains, along the Yangtze River and southern Jiangsu, along the Huaihe River in Anhui and south of it, in the north-central Zhejiang, and in Shanghai. The other wheat areas in the Yangtze River Basin and the southern part of Huanghuai are moderately popular. Possibly, the area of ​​the country is about 60 million mu.
Potato late blight has a high prevalence in the main producing areas of Southwest, Northwest, Northeast, etc. Among them, Guizhou, Yunnan, Chongqing, Sichuan, Gansu, Ningxia and Inner Mongolia have higher prevalence risks, and other areas are moderately prevalent, with an area of ​​about 35 million mu. .
At present, the wheat varieties of China have certain resistance to scab, except for the Emai and Yangmai series. The main varieties in the middle and lower reaches of the Yangtze River and the Huanghuai disease are often not resistant to disease; the national potato sweet potato series, the nemesis series, and the Wei The planting area of ​​the late blight resistant varieties such as the cockroach series is small, and the planting area of ​​the susceptible varieties is over 60%. Due to the cultivation of the sorghum for many years, the variation of the pathogen population leads to weakened resistance, which is conducive to the occurrence of diseases.
Rice blast, wheat scab, and potato late blight are typical climatic diseases. The source of bacteria in most parts of the country is widespread, and the climatic conditions in key periods determine the prevalence and extent of each disease. During the tillering and heading stage of rice, the temperature is suitable, the rain or rain is continuous or the fog is foggy, and rice blast is a pandemic. During the period of wheat heading and flowering, there is much precipitation and the humidity in the field is high. Especially in the rainy weather of 3 days or more, the scab is biased to the pandemic. The potato growing area is rainy or foggy, and there are many central crops in the field. If the high-humidity weather is still warm in the daytime, the disease will spread to the whole field within a week, causing a pandemic.
High precision colorimeter,Portable coating colorimeter,Dyeing dye colorimeter
CHNSpec Technology (Zhejiang)Co.,Ltd , https://www.chnspec2013.com