The occurrence and prevention of diseases and insect pests in summer harvest crops

First, the dynamics

Affected by factors such as the amount of bacteria, climate, crop growth, etc., the main pests and diseases of wheat and rapeseed in the province are relatively light, and the overall degree is heavier than normal. There are mainly stripe rust, powdery mildew, sclerotinia, downy mildew, aphids, etc. The area of ​​occurrence is 1.185 million mu. Occurrence characteristics: First, the disease occurs more than insects. As the temperature rises, the rainfall increases, wheat stripe rust, powdery mildew, rapeseed sclerotinia, downy mildew rises faster; second, the area of ​​wheat pests and diseases occurs 361,300 mu, west, The southern part has a wide range and the degree of occurrence is heavy; the third is that stripe rust is seen earlier, with an area of ​​76,000 mu, which is obviously more than that of the same period of last year, involving 19 counties (autonomous regions and municipalities) of 5 cities (states). The Nayong County is in the epidemic stage from the occurrence of the film to the spread. The Hezhang, Panxian, Liuzhi and other counties (districts, cities) are in the stage of sporadic occurrence to spotting.

Second, the trend

At present, the wheat in our province is in the tillering stage to the jointing stage, the rapeseed is in the flowering stage, and most of the potatoes are in the seedling stage. Recently, there are many sunny and rainy weathers in our province. According to meteorological predictions, the temperature in the spring is high in most areas and the precipitation is normal. Combined with the current situation in the field, the layout of the varieties, and the comprehensive analysis of the occurrence rules over the years, it is expected that the major pests and diseases of wheat will occur this year, with an area of ​​about 450. In the case of 10,000 mu, the area of ​​strip rust is about 1.2 million mu. The main areas are Bijie City, Liupanshui City, Zunyi City, Southwest Guizhou Province, Qiannan Prefecture, Tongren City and Guiyang City. The prevailing period is from early March to May. In the first ten days, rapeseed pests and diseases occurred in a medium-sized area, with an area of ​​4 million mu; the potato late blight in winter and spring occurred heavily, with an area of ​​2 million mu.

Third, prevention and treatment opinions

As the temperature rises, wheat stripe rust and rapeseed sclerotinia will spread rapidly during the epidemic period. Potato late blight will spread continuously. All localities should do a good job in monitoring and early warning, focusing on the main crop producing areas and the main pest-prone areas. Issue information on pests and diseases, and achieve “early detection, early warning, early prevention and control”. In view of the current situation of pests and diseases, all localities should actively organize the development of pests and diseases with the goal of improving control efficiency, reducing costs, reducing drug use, and ensuring production. Anti-rule, do a good demonstration of comprehensive prevention and control technology, fully display technologies such as agricultural control, biological control, ecological control, physical control and scientific drug use, increase publicity and training, raise farmers' awareness of pests and diseases, and advocate green plant protection concept. Improve farmers' correct decision-making ability and scientific prevention and control.

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