Pay attention to stem blight of cotton leaves
Recently, cotton leaf blight has developed on individual fields in our cotton fields. It is a kind of physiological disease. It usually begins at the early flowering stage. It is heavier and more prevalent at flowering stage to belling stage. In our city, it is sporadic onset in July and August, and it reaches peak incidence in the middle to late September to October. The victims suffered from light yellow and thin bells that were small and small, with short fibers and poor boll opening. Plants with severe disease died prematurely and caused bolls to fail to mature, which greatly affected the yield.
First, the onset of symptoms, the leaves appeared red, purple spots, and gradually expanded to full-brown red-brown, brown, leaves from the bottom up into a light rod. Sometimes the diseased leaves can also be red-yellow and accompanied by wilting of plants, eventually leading to the death of the whole plant. Unlike fungal diseases, veins are still green and vascular bundles do not change color.
Second, the cause of heavy rain, sunny, transpiration is strong, roots, poor ability to absorb nutrients, the emergence of physiological disorders, can cause cotton stem blight occurs, potassium deficiency can exacerbate the disease development. Through successive years of investigation, it has been confirmed that the stem blight of cotton leaves is heavy in plots with low potassium application, and that in sandy loam is heavy.
In addition, the incidence of premature senility is heavier, which is mainly due to the lack of adequate supply of fertilizer and water during the reproductive growth period, resulting in poor root growth environment, making the cotton plants poor in stress resistance, and accelerating the incidence of red stem blight.
Third, prevention and control measures to prevent cotton stem blight, should pay 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. After the onset of cotton, spraying fungicide such as metalaxyl and carbendazim in 2 to 3 times to prevent the invasion of other pathogens and alleviate the disease. When spraying, 100 grams of potassium dihydrogen phosphate can be used as foliar fertilizer in the mu, which can make up for the fertilizer and achieve the effect of controlling the disease.
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