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Prevention of Cotton Bacterial Blight
Since late July, the area of ​​occurrence of cotton leaf blight has gradually expanded. If it is not properly prevented, it will result in severe reductions in production, or even no harvest. Cotton leaf blight is a physiological disease. At the early stage of disease, the leaves are dark green and gradually turn yellow to purple. Unlike fungal diseases, veins are still green and vascular bundles do not change color. The occurrence of this disease is closely related to the soil, nutrients, climate, and farming conditions, and in particular, potassium is crucial. Since the beginning of summer this year, continued high temperature and drought, the cotton plant growth and development is poor, followed by heavy rain, clear, transpiration is strong, the roots of shallow absorption of nutrients, the emergence of physiological disorders, resulting in cotton red leaf blight, potassium deficiency and intensified disease progression. To prevent cotton leaf blight, we must pay close attention to preventive measures from the time of sowing. Replant farmyard fertilizers, increase application of phosphorus and potassium fertilizers, formula fertilization, improve soil fertility, repair irrigation and irrigation systems, and prevent drought and stains. In the early stage of disease, when the symptoms of yellow leaf stems appear, spraying 2% urea and 0.2% potassium dihydrogen phosphate mixture, 100 kg per mu, spraying 2-3 times, with obvious results.