Disease. Diseases at the seedling stage are the main obstacles affecting the complete cotton seedlings and seedlings. There are ten diseases that damage the roots of cotton, which can cause rot, shoots, stem rot, and root rot, followed by root rot. Diseases that are dominated by cotyledons, true leaves, and stems have stem blight, corneal lesions. Disease, spot disease, soft rot, etc. But the greatest impact on cotton development is: blight, anthrax, and red rot. Before the emergence of the cotton seedlings, the disease can cause bad seeds, causing rotten seeds, rotting buds, and root rot. Lightly affect the growth and development of cotton seedlings, resulting in a large number of seedlings dead seedlings, resulting in serious seedlings, broken ridges, severe cases caused devastating deaths throughout the field. Control methods: rational rotation, fine soil preparation, balanced fertilization, application of organic fertilizer or biological antibiotic fertilizer, use of coated seeds, continuous exposure for 2 to 3 days before sowing, and appropriate sowing in order to improve sowing quality. At the seedling stage, shoots were rooted with 80% eutectic 200-fold or 50% carbendazim or 70% thiophanate-methyl or carbonate or damycin. In the boll stage, 50% of carbendazim can be used to control cotton red rot, and 500 times of 70% of mancozeb manganese dioxide can be sprayed.
Insect pests. Cotton seedlings are mainly cotton aphids, cotton leafhoppers, cotton aphids, ground test tigers and so on. With the popularization of transgenic insect-resistant cotton, cotton intercropping and the use of cotton-covered cotton plants, the number of natural enemies of pests in cotton fields has increased, and the types and harm levels of cotton pests have also undergone great changes. Therefore, the prevention and control of pests at the seedling stage of cotton should pay attention to the protection and utilization of natural enemies, distinguish different types of cotton fields, and carry out pest forecasting and control respectively. The prevention and control of cotton seedling pests was focused on cottonseed meal. The seeds were first dressed with 3% carbofuran and then treated with omethoate after emergence.
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