During the jointing stage of wheat--the re-greening period of Huanghuai and the northern winter wheat area, the soil moisture is sufficient and the wheat seedlings are generally good. However, the wheat population in some areas is too large or prosperous, which is conducive to the wintering of pests and diseases. At present, the area has entered the jointing period from south to north, and the main targets are stripe rust, powdery mildew, sheath blight, red spider and underground pests.
In terms of prevention and control, the area focuses on early prevention of pests and diseases. In the spring, pay attention to the prevention and control strip rust early wheat field, to control the disease center, to prevent disease epidemics. At the same time, it is necessary to strengthen the prevention and control of powdery mildew, sheath blight, red spiders and underground pests.
The winter wheat area in the middle and lower reaches of the Yangtze River has a long sowing date and complex seedlings. The sowing of rice buckwheat is late, the seedlings are weak, and the soil in some areas is wet, which is conducive to the occurrence of diseases such as sheath blight and powdery mildew. Conducive to the survival and development of Fusarium oxysporum. The main focus of prevention and control in this area is sheath blight, powdery mildew and red spider.
The overall situation of the seedlings in the northwestern wheat area is generally good, which is conducive to the infection and disease of stripe rust, but the continuous drought is not conducive to the expansion and spread of stripe rust. In this area, the autumn spleen rust disease is early, and the bacterial source base is large. However, many dry disease deaths in the later stage are more common. Other pests and diseases are equivalent to previous years, and warm winter weather is conducive to wintering. At present, the main targets for prevention and treatment are stripe rust, powdery mildew and spider mites.
Northwest wheat area is not only an important summer area for stripe rust, but also a key winter area. Early-onset fields in southwestern Shaanxi should be combined with census and systematic investigations, insisting on “discovering one point, preventing and controlling one piece, discovering one piece, and preventing and controlling the whole fieldâ€.
When a single diseased leaf is found in the field, it should be controlled in the area of ​​2 meters in diameter at the point of disease. When a single disease center is found, the 20-meter diameter area should be prevented in time to block the disease center and prevent the spread of the disease. From the end of March to the end of April, combined with the monitoring of the disease situation in the field, timely control of the incidence center of stripe rust, and prevention of powdery mildew, the use of triazole fungicides. In the case of arid climate, pay attention to the control of red spiders.
The seedling situation in the southwest winter wheat area is generally good, and the soil moisture is suitable. Due to the high soil and air humidity, it is conducive to the occurrence and spread of stripe rust and powdery mildew; some field wheat aphids also occur.
As the winter stripe rust in the southwestern region is still spreading or even prevalent in winter, the monitoring and early control of stripe rust should be strengthened. In the early diseased field of wheat stripe rust in winter and winter, when a single diseased leaf is found, it should be 10 m in diameter in time. The wheat crops are controlled by chemicals to prevent the spread and spread of spring fungi.
At the same time, it is necessary to strengthen the prevention and control of powdery mildew, wheat bran, and red spider. When a variety of pests and diseases occur in the southwest wheat area, "one spray and more defense" can be adopted, and the control agent can be mixed with a triazole fungicide, acetamiprid, imidacloprid, anti-polygon and other insecticides.
This article URL: 2015 national winter wheat jointing period pest control opinions
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