Control of Red Leaf Stem Blight of planting Cotton
Cotton red leaf stem blight is a physiological disease, and it is one of the main diseases in the middle and later stage of cotton. over the years, the occurrence of red leaf stem blight in sandy loam and barren cotton fields in our county is more serious. Red leaf stem blight broke out in dry years, especially in rainy or rainy weather for a long time. Cotton plant withered and died, and the damage caused by the disease was greater than that caused by other diseases.
Control methods: the occurrence of red leaf stem blight is closely related to soil, fertilizer, water, climate, farming system and other environmental conditions. therefore, the prevention and control of the disease should be taken to increase the application of organic fertilizer, improve soil, increase potassium fertilizer, strengthen field management and prevent cotton from fertilizer deficiency in the later stage. In the cotton flower and boll stage timely topdressing, pay attention to the application of potash fertilizer. In the years of drought and little rain, the cotton fields without irrigation conditions can be ditched with plant ash, rare manure and urine for 3 times, and the disease control effect is good.
At the initial stage of the disease, foliar spraying of potash fertilizer can be carried out, and 2% potassium chloride (either potassium sulfate or potassium nitrate) or nitrogen fertilizer solution can be sprayed, or 100 kilograms of plant ash can be applied per mu, which has a significant effect on disease prevention and yield increase. Drought and lack of water in cotton fields should be ditched in time to fight drought, but do not flood irrigation.
Medicament can be used to prevent and cure the disease in time. Methods: spraying 30ml amino acid + 5ml propiconazole + 40g high quality potassium dihydrogen phosphate + 30g zinc boron fertilizer and spraying 15kg water for 3 times every 7 days can effectively control cotton red leaf stem blight.
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How to increase the proportion of cotton peach by planting cotton
The types of cotton bud and boll shedding include physiological shedding, pest damage shedding and mechanical damage shedding. In terms of the reasons for physiological shedding, first, excessive application of fertilizer and water results in prosperous growth, excessive nutrient consumption in the early stage, and insufficient supply in the later stage; second, the density of cotton fields is too high and branches are in short supply.
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The effect of foliar fertilizer spraying on planting cotton is good.
In the later stage of cotton growth, the root activity gradually declined, the absorption decreased, and it was too late to apply boll fertilizer on the ground, which could not meet the nutrient needs of cotton boll growth. Spraying foliar fertilizer can supplement nutrition, prevent premature senescence, prevent diseases, attack big peaches, promote early ripening,
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