The etiology of cotton diseases
Inferior seeds, low temperature, high humidity and extensive sowing are the factors of cotton disease.
1. Under climatic conditions, all kinds of pathogens of cotton diseases propagate rapidly under high humidity conditions, while low temperature is not conducive to the growth and development of cotton roots. In some early sowing cotton fields, under the condition of cold and rainy spring, young roots grow slowly, and pathogens are infected frequently, which is easy to cause rotten seeds and buds.
two。 Seed quality seed maturity is low, or damp mildew, easy to rot seeds, rotten buds; not only not conducive to seedling emergence, but also mostly weak seedlings after emergence, easy to be infected.
3. Tillage and cultivation measures continuous cropping cotton field accumulates more germs, which is more prone to disease than intercropping and rotation wheat field. The longer the years of continuous cropping, the more serious the disease. In the cotton fields with low-lying terrain and poor drainage, the soil moisture is high, the ground temperature is low, the ventilation is poor, the root system of cotton seedlings is not well developed, and it is easy to suffer from the disease; extensive soil preparation or tillage, rough soil, or too thick sowing cover all affect the emergence of cotton seedlings, and the disease is serious; sowing prematurely, the emergence of cotton seedlings is slow and easy to occur.
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Prevention and Control of Cotton Diseases should start at Seedling stage
The main diseases in cotton seedling stage are blight, anthracnose, black spot, quenching, root rot and so on. The main cause of cotton seedling disease is seed and soil bacteria. Once the suitable climatic and environmental conditions are encountered, cotton seedling disease will occur seriously, endangering the normal growth of cotton seedlings. In general, the incidence of seedling disease is 30% to 50%. In recent years, with the popularization of transgenic insect-resistant cotton, the seedling disease of cotton is gradually aggravated, which directly threatens the early development of whole and strong seedlings of cotton. Therefore, the comprehensive control of cotton seedling diseases has been achieved.
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What if the cotton was blown to death by Rain Water?
After timely elimination of waterlogging and clearing of silt ditch cotton fields, the physical and chemical properties of the soil will change. Excessive humidity and lack of air will cause suffocation in the cotton fields. Even if they do not die, they are also susceptible to disease and are not conducive to root binding. Waterlogging must be eliminated as soon as possible. At the same time, the silted ditches, waist ditches and chamber ditches must be cleaned to reduce the groundwater level and create a good ecological environment for cotton seedlings to restore growth. Help the seedlings to wash the seedlings in time, and wash the seedlings while returning water. Clean the silt from the cotton leaves and stems so that the cotton leaves can recover as soon as possible.
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