The diseases occurring before cotton budding are collectively referred to as seedling stage diseases. Since the young leaves of the cotton seedlings are less budded and the roots are not yet developed, the bacteria can easily infect the cotton seedlings, and the light cotton seedlings can grow when encountering low temperature and rainy weather. Weak water, which caused a large area dead seedling phenomenon. Therefore, the identification and control of Miao disease is a key factor in seizing the high yield of cotton.
First, the main diseases and symptoms of cotton seedlings
1. Blight. After the infection, the symptoms appeared on the base of the young stem near the ground, and began to show yellowish-brown spots, which gradually expanded, and finally the depressions shrank. The depressions collapsed as they lost too much water, and eventually turned into dark brown rot. Severe death can occur
2. Anthrax disease. Purple or violet exposed stripes are produced at the base of the stem or a little upper part, gradually expanding into a fusiform lesion, with a depression in the middle, severe vertical dehydration, and finally the seedlings can die.
3. Blight disease. Wilt disease at the seedling stage has also been more serious in the field in recent years and generally occurs in two types. 1 Yellowing type: Cotyledons or true leaves mostly begin to yellow or yellow locally from the edges of the leaves, yellowing leaves gradually increase, and the leaves are wilting, dry, and falling off. 2 purplish red type: Cotyledons or true leaves are partially or mostly purple-red or purplish-red spots, and veins of diseased leaves are mostly purple-red, and the leaves are wilting and dry, falling off or falling off.
Second, prevention and control measures
In addition to the selection of disease-resistant varieties, rotation cropping, fine soil preparation, and appropriate sowing at the sowing date, the following measures shall be adopted in the seedling stage:
1. Timely cultivator after rain. In case of rainy weather, after the rainy days, it can be ploughed in time to increase the permeability of the soil and reduce the infection of the bacteria.
2. Seedlings in the morning and timely soil sealing. After the seedlings of cotton seedlings are seedlings, the seedlings are usually planted with 2 or 3 seedlings per hole, so that the soil nutrient concentrates to supply a small number of cotton plants, so that the cotton seedlings grow robustly, and the soil is sealed in time after the seedlings to increase the temperature and reduce the occurrence of seedling diseases.
3. Chemical control. After the seedlings of cotton seedlings are exposed, they can be sprayed with chemical agents to prevent the occurrence of large-scale disease when they encounter low temperature, rain or cold. Can generally be used 50% carbendazim 800 times for chemical control.
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