There are two main reasons for cotton rotten bells. First, the disease caused by rotten bells, such as keratopathies, epidemics, anthrax, red rot, pink powder, black fruit and so on. The pathogens adhere to the seeds or the body of the sick bell shell and remain in the field for winter. In the second year, the germs are transmitted by air currents, rain, and insects. They are invaded by wormholes, lesions, mechanical wounds, cotton bolls, or directly invaded. , causing bad bells. If it is rainy in August and September, the humidity is high and the weather is sultry. In particular, when winds and heavy rains cause bolls to be injured, it can cause serious illness. The high density of cotton or excessive nitrogen fertilizer has caused the branches and leaves to grow in length, and the pruning of old leaves has not been able to keep up with timely measures. This has resulted in poor ventilation and light transmission in the cotton fields, high humidity in the field, and heavy occurrence of bell disease. The second is the harm of pests, especially the damage of bollworm, resulting in a large number of wounds, which is conducive to the invasion of germs, which in turn causes the occurrence of bell disease.
To prevent and treat cotton rotten bells, we mainly do "six controls":
First, control the amount of nitrogen fertilizer under normal circumstances, flower bell fertilizer and peach fertilizer can apply about 10 kg / mu nitrogen fertilizer is appropriate. For cotton fields that have been replanted with bell-bell fertilizers or no tendency to premature aging, less or no peach fertilizer should be applied, and growth regulators such as Chrysanthemum and Chlormequat should be used to control their appetite and avoid budding, falling flowers and falling bells.
Second, to control the humidity in the field In the season of rainy water, flood control is the key measure to prevent cotton rotten bells. Therefore, it is necessary to ensure that water is discharged in the rain, and there is no waterlogging in the fields after the rain, so as to create external conditions favorable to the growth and development of the cotton roots, which is not conducive to the growth of various germs.
Third, the control of the cotton plant Wang long for cotton branches growing trend of the prosperous cotton fields, should be combined with the whole branch cut in batches to the middle and lower old leaves, for the autumn hair crazy long cotton field, to take "open skylight" and push the strains to dry and other remedial measures to Improve ventilation and light transmission conditions to prevent cotton rotten bells.
Fourth, the control of disease due to cotton rotten bell mostly red rot, anthrax and diseases caused by diseases, so the prevention and treatment of disease is an important measure to prevent cotton rotten bell. Most of the sprayed parts were flower buds, tender bells, bells, and bells. The spraying types were 70% thiophanate-methyl wettable powder 1000 times or 50% carbendazim wettable powder 500 times or 80%. Sen Zinc wettable powder 600 times liquid, sprayed every 5 to 7 days for the second time, it has a better prevention and treatment of the disease.
V. Control of Insect Occurrence For cotton borer and red bollworm-based pests, the occurrence of pests should be controlled by artificially capturing old larvae and chemicals to control young larvae on the basis of previous prevention and control.
VI. Controlling rotten bells For long-term hanging culms on rotten bells whose fibres are not yet mature, timely picking should be carried out and the bolls with germs should be brought out of the field for centralized treatment to reduce the incidence and reduce the incidence. The rotten bell that has been fully matured in the cotton bolls should be promptly grabbed, stripped in time, and promptly dried in order to reduce economic losses.
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