The main diseases of cotton seedlings include blight, anthracnose, red rot, damping-off, black spot, stem blight, etc., and comprehensive measures should be taken to prevent and control them.

The improved soil can improve the soil and improve the control of seedling diseases by increasing organic fertilizers, promoting straw return, intensive cultivation, and other measures to fertilize the soil. Practice has shown that the return of cotton straw to the field can increase the content of organic matter and potassium in the cotton field and inhibit and reduce the occurrence of disease at the seedling stage.

The selection of resistant varieties for selection of good varieties and coating with 25 g/L fludioxonil suspension seed coating can prevent seedling disease.

When the ground temperature is stable and the sowing temperature is stable above 14°C, the weather is abnormal and the temperature is low this year. It should be sown 5-10 days longer than usual. Appropriate late sowing can reduce the incidence of seedling disease, but also to prevent premature aging and bad bell.

Rationalize the use of 48% trifluralin cream 60-72 ml per acre before sowing (50 ml per acre for mulching film covering cotton fields) and mix the soil after application. The use of trifluralin in successive years should replace other herbicides to prevent injury and increase disease at the seedling stage. Use 90% acetochlor EC, control the amount of 50-60 ml per acre, before seeding after sowing, plastic film covering cotton fields should not be applied. Pre-planting or post-emergence application of 33% Penicillin EC per acre 66-100 ml, the drug on the control of broadleaf grass is poor, broad-leaved grass more than the field should mix it with other drugs. The amount of 72% metolachlor EC per acre is 100 ml. It is applied before seedling after sowing, and the soil is required to be lightly mixed when the soil is dry.

Strengthen the field management before and after the emergence of field management to strengthen the management of the field focusing on cultivating loosing soil, warming and protecting crops to reduce the harm of seedling diseases, and pay attention to the ploughing after the rain. The plastic film covers the cotton in a timely manner and puts the seedlings in the soil to plug holes, preventing the wind from lifting the membrane. Severely diseased early-stage seedlings (1 leaf and 1 heart period) are seedlings (after 3 leaf periods) to ensure seedlings are full and seedlings are strong.

There are two peaks during the seedling stage of cotton seedling disease prevention, namely the l leaf stage and the 3 leaf stage of the cotton seedlings, which should be prevented in time. Usually, 85% trichloroisocyanuric acid WP 35 g/water is sprayed per mu. At the beginning of the disease, 50% carbendazim WP, 70% mancozeb water dispersible granules, and 70% thiophanate-methyl WP can be sprayed with 500-800 times liquid. Early occurrence of Fusarium wilt can be sprayed with fulvic acid and other fulvic acid foliar fertilizers to enhance the disease resistance of plants. With 1 billion live spores / g Bacillus subtilis WP 500 times Irrigation, the seedling stage disease has a better control effect.

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