Three measures for prevention and control of corn sheath blight
Corn sheath blight is an important disease that harms corn, mainly affecting leaf sheaths, and can also damage leaves, ears and loquat leaves. When the disease is severe, it can invade solid stalks, but generally does not cause lodging. The disease has occurred to varying degrees throughout the country. In addition to harming corn, it can also invade a variety of grass crops such as rice , wheat, barley, sorghum , and dicotyledons such as cotton and soybean . In recent years, there has been a gradual increase. The general incidence rate is 70-100%, the yield is reduced by 10-20%, and the re-investment area is reduced by more than 35%.
First, the removal of bacterial sources: First, remove the diseased plants and carry out tillage. Eliminate weeds in the field, eliminate the source of wintering bacteria, and reduce the source of infection at the beginning of the second year. The second is to remove the diseased leaves at the beginning of the disease. Timely stripping the susceptibility leaf sheath and leaves at the base and burning them in a concentrated manner to cut off the path of disease and prevent further spread. In areas with severe disease, the diseased leaf sheath at the base of the plant can be stripped during the cultivating and weeding, and the diseased leaf sheath at the base of the stem can be coated with the drug.
Second, cultivation control: cultivation and prevention is based on the premise of high yield, using cultivation techniques to control the occurrence and development of sheath blight, which is conducive to the balance of ecological environment, but also conducive to the growth and development of host crops. One is to choose a hybrid that is excellent for disease resistance. Such as the current production of the promotion of Ludan 981, Jinhai 5, Nongda 108 and other varieties. The second is to pay attention to ditch drainage in time to reduce the humidity in the field and reduce the incidence. The third is to apply nitrogen fertilizer , rational close planting, improve ventilation and light transmission conditions in the field, reduce field humidity, etc., to reduce the disease.
Third, the chemical control: the use of pesticides to focus on the prevention of corn base, protection of sheaths. You can use 5% Jinggangmycin water 1000-1500 times liquid, 50-22.5 ml per mu, spray 22.5-30 kg water; or spray 40% sclerotum 1000 times liquid, or 70% A Base buzzon WP 500 times liquid spray.
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