The stem blight of cotton leaves is a physiological disease. It is one of the major diseases in the middle and later stages of cotton. In the past years, sandy soil and barren cotton fields in our county were severe. In dry years, especially in long-term drought or continuous rain, the leaves of red leaves are dry An outbreak of disease caused the death of a cotton plant and the damage of the disease outweighed the losses caused by other diseases.
Control methods: Occurrence of red leaf blight is closely related to the environmental conditions such as soil, fertilizer, water, climate, and farming systems. Therefore, prevention and treatment of the disease should include increasing organic fertilizer, improving soil, increasing potash fertilizer, and strengthening field management. Prevent the lack of fat in the late cotton. During the flowering period of cotton, fertilizer is applied in time, and potassium fertilizer should be added. In dry and rainy years, cotton fields without irrigation conditions can be planted with furrows, dilute human excreta, and applied for two to three times with good disease control.
The early stage of the disease can be sprayed with foliar potassium fertilizer, spray 1- 2% potassium chloride (potassium sulfate, potassium nitrate can be) or nitrogen fertilizer solution, also can be applied per acre more than 100 kilograms of plant ash, prevention and disease increase significantly. Dry and dry water shortages should be dredged, watered, and drought-proof, but flooding should be avoided.
After the onset of disease can be used to prevent and cure. Method: Use amino acid 30 ml + propiconazole 5 ml + high-quality potassium dihydrogen phosphate 40 g + zinc and boron 30 grams, 15 kg spray control, every 7 days, even spray 2 - 3 times, can effectively control Cotton leaf blight.
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