Wheat cyst nematode disease is a new disease discovered in the late 1980s in China. It has been found in Henan, Hebei, Shanxi, Beijing, Hunan, Shandong, Gansu, Anhui, Inner Mongolia, Shaanxi, and Qinghai Provinces. The damage has been aggravated in recent years. Seriously affected the safe production of wheat. Symptoms appear one month after the emergence of the affected wheat, but they do not show up until after winter. The lower leaves begin to turn yellow from the tips of the leaves, and then the whole leaf becomes lighter and darker in color, withered; the diseased seedlings grow weaker and the tillers decrease significantly; some plants are dwarfed, the panicles are small, and the grain is not full, similar to the lack of fertilizer, but the top dressing has no effect. . Severe disease will be a piece of dead, roots can see many nodular root knots, long root roots on root knots, roots and then formed root knots, making the roots chaotic, distorted, into a group. White cysts, the size of the needle, can be seen on the surface of the root and turn brown later. Root knots and cysts are the main basis for identifying the disease. The cysts of wheat cyst nematode are transmitted by the cysts, mainly relying on the spread of soil. Agricultural machinery, especially wheat harvesters operating across regions, human and livestock activities, flowing water and strong winds may play a role in transmission. In addition, wounds caused by nematodes can easily cause root rot. Since the cysts of wheat cyst nematode can survive in the soil for many years, the cost of chemical control is high, and the toxicity of the agents is large, non-chemical control methods are mainly used. At present, it is necessary to seize the favorable opportunity that the disease is not widely distributed, do a good job in the census, identify the affected areas and implement strict quarantine measures, especially for agricultural machinery and equipment that operate across regions. For regions where wheat cyst nematodes have already occurred, one must rotate as many non-host plants as possible, such as soybeans, mung beans, peas, canola, millet, clover, alfalfa, carrots, or corn; secondly, breed and use resistant varieties. This is the most economical and effective method; Third, rational application of fertilizers, including the application of organic fertilizers to increase the content of humus, cultivate beneficial organisms and increase plant resistance to disease; In addition, in some winter wheat areas, proper late planting can also reduce the damage. Chemical control, can be considered in the sowing period of wheat, with the application of 15% aldicarb Granule 0.5 ~ 1.5kg/mu, thiazole phosphorus (10% blessing more) granules 30kg/mu or 2% avermectin granules 1～3kg/mu. Severe disease fields can be considered before sowing with chloropicrin, cotton wool and Weibaimu for soil fumigation.
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