After a heavy rainstorm, red leaf stem blight can easily occur in cotton plants. This is a physiological disease that typically begins at the growth point of the main stem or the tip of the fruit branch. It usually progresses from the top down and from the outside inward. The main stem may wither and die, but the vascular tissue remains colorless. The root system becomes short and stunted, with fewer roots. Timely application of **pesticides** is crucial to manage this condition.
The causes of red leaf stem blight include: first, extensive cotton cultivation leading to poor root development; second, poor drainage in the fields; third, excessive nitrogen fertilizer use, which promotes vigorous growth and creates shaded conditions; and fourth, insufficient organic matter in the soil, resulting in low fertility. When weather changes suddenly and the growing environment is poor, cotton plants with physiological imbalances are more susceptible to this disease.
To control red leaf stem blight, several key measures should be taken. First, enhance the plant's stress resistance. For vigorously growing cotton, apply a plant growth regulator like ketamine or auxin. Mix 2-3 grams of ketamine or 8-12 ml of auxin with 50 kg of water per acre and spray it evenly. Second, improve soil management by timely cultivating and breaking up the crust to promote better root development. Third, for low-lying areas, ensure proper drainage by clearing ditches to help the roots grow stronger. Fourth, in double-film cultivation systems, remove the mulch film promptly to encourage deeper root development.
Second, increase potassium fertilizer application to improve nutrient efficiency. According to the **Pesticide Network**, potassium deficiency is one of the main causes of red leaf stem blight. For fields with potential potassium deficiencies or those receiving low potassium input, apply 10-15 kg of potassium fertilizer per mu. This not only meets the plant’s potassium needs but also helps adjust the fertilizer ratio, improving the absorption efficiency of nitrogen and phosphate fertilizers.
Third, perform root feeding to improve oxygen supply and nutrient availability. If the leaves have not yet wilted and the main stem's growth point is still active, the plant can recover quickly through root dressing. First, apply 100 ml of humic acid active liquid fertilizer per mu mixed with 50 kg of water. This provides essential nutrients while improving soil aeration. Second, use 100 g of a multi-nutrient fertilizer per acre mixed with 50 kg of water to supplement both macro and micronutrients. Third, spray a plant growth agent called "802," which stimulates cell division and enhances the plant's self-regulation ability.
By implementing these strategies, farmers can effectively manage red leaf stem blight and improve the overall health and productivity of their cotton crops.
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