MySheen

Occurrence and Control of Red Leaf Stem Blight in Cotton

Published: 2024-11-09 Author: mysheen
Last Updated: 2024/11/09, 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 acceleration of the disease.

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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