Occurrence and Control of Red Leaf Stem Blight in Cotton
Disease symptoms and occurrence regularity: cotton red leaf stem blight is a kind of fulminant disease that often occurs in the middle and later stage of cotton. It can make the leaves turn red from the bottom up until they fall off. The veins remain green, the mesophyll turns red, and the leaves become thicker, brittle, wilted and finally fall off. Cutting the stem without changing color can be distinguished from cotton wilt and Verticillium wilt.
Generally in the old cotton area, the cotton fields with continuous planting, sandy land, shallow plough layer or lack of potassium fertilizer are more serious. In the middle and later stage of drought, the serious lack of potassium and zinc in the soil can easily lead to the accelerated occurrence of the disease.
Prevention and control methods: increasing the application of potassium and zinc fertilizer, applying 15 kg of potassium sulfate per mu, 1 kg of zinc sulfate and 10 kg of ferrous sulfate can reduce the incidence of the disease. In the early stage of growth, fish protein can be prevented for 3 times and 4 times, and the occurrence of the disease can also be controlled. after the disease occurs, spraying foliar surface with 0.3% zinc sulfate solution of red leaf stem can also control and alleviate the damage of the disease.
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Three inducing factors of Red Leaf Stem Blight in Cotton
Cotton red leaf stem blight is a physiological disease caused by potassium deficiency, which occurs in the middle and later stages of cotton growth, especially in dry years. The disease of cotton in the field generally begins to show in the bud stage, and the disease is the most serious in the boll opening stage. The symptoms were mainly on the leaves, and the diseased leaves developed from the top to the bottom and from the outside to the inside. The diseased leaves began to lose green from the edge, first yellow, then red spots, and finally the whole leaf turned red, the mesophyll thickened, wrinkled and brittle, and the veins remained green. When the disease is serious, the leaves of the whole plant turn red and brown after losing green, and the leaves scorch and fall off into smooth rods.
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The effect of reasonable spraying Brassi Shuofeng 481 on cotton is good.
Shuofeng 481 is a brassinolide product extracted from plant pollen and its derivatives. it comes from plants and acts on plants. It has the functions of promoting cell division and elongation, promoting photosynthesis, delaying senescence, improving stress resistance and so on. It has a variety of effects of auxin, gibberellin and cytokinin. Cotton is a crop with a long growth period, and its growing season goes through the process from low temperature to high temperature to low temperature and from high humidity to drought. Reasonable spraying of Brassi Shuofeng 481 in the whole growth period of cotton can promote the growth and improve the growth of cotton.
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