1. Appropriate control: After entering the rainy season, the cotton plants are extremely prone to madness, causing the beetle to fall off. In time, the growth of the cotton plants can be stabilised by the use of the contracting amines or auxin, and the growth of the plants can be improved. The method is: When the cotton in the early stage of rainy season begins to blossom, use 6-8 milliliters of assisting factor or 1.5-2 grams of salicylamine per acre and add 25-28 kilograms of water to the spray. During the middle of the rainy season (about the end of July and early August), about 3 grams of dildosamine per acre, add 30-40 kg of water spray. The application of dilute amine requires that the top of each plant and the top of the fruiting branch be uniformly distributed, and the amount of water should be small. It is usually sprayed after 3 pm or before 10 am to prevent evaporation at high temperatures. After spraying, heavy rain should be sprayed, and the amount should be reduced by half.
2, control of fertilizer: Into the rainy season, cotton plants have long branches and leaves and increase buds, the requirements of fertilizer and water for a lifetime peak, timely recovery of fertilizer should be to prevent premature aging defertilization. The rainfall in the rainy season is conducive to the fertilizer effect of various fertilizers, resulting in a long and mad growth of the cotton plant. For the cotton field with sufficient base fertilizer and large amount of fertilizer, it should be applied with little or no fertilizer, and pay attention to the drainage of the ditch to prevent the occurrence of waterlogging. The cotton field with slow growth, red stem to the top, and small yellow color of the cotton field should be applied early. Large amount of fertilizer, such as urea dosage is about 8 kg per mu. In addition, if there is a continuous drought, the soil moisture content is less than 60% of the field water capacity, should be timely irrigation.
3, to axillary buds to fight the top: the rainy season cotton plants grow quickly, axillary buds are also prone to occur. Rain clearance should be promptly wiped out buds. When a cotton plant grows to a predetermined plant type and has a predetermined number of fruit branches, it is necessary to break down and suppress the growth of the top, reduce the consumption of nutrients in the upper no-effect branch, and promote the development of cotton bolls. It should be timely (approximately mid-to-late July) topping.
4. Control of pests and diseases: The occurrence of various pests and diseases has a great relationship with the rainfall conditions in the rainy season. Drought is not conducive to the hatching and larval development of H. armigera eggs. Precipitation and rainfall will also hinder the hatching of eggs. Especially heavy rain has strong scour action on eggs and newly hatched larvae. If the rainfall is small and even in the rainy season, it will be beneficial to the outbreak of bollworm. Low rainfall and severe drought during the rainy season are beneficial to the propagation of red spiders. During the rainy season, there was continuous rain, the cotton plants grew madly and severely, and the fields were poorly drained. They were prone to brown wilt and susceptible to rotten bells. The prevention and control of cotton pests and diseases should be based on the weather during the rainy season and the occurrence of pests and diseases, and rational selection of pesticides.
5. Dealing with natural disasters in a timely manner: After the rainy season, disasters such as drought, waterlogging, hailstorm, and windy wind are prone to occur. We must, on the basis of strengthening our defense, respond to irresistible disasters and take measures to rescue them in a timely manner so as to mitigate the hazards. After the occurrence of flood disaster, irrigation and fertilization should be promptly conducted to promote the cotton to restore its vitality as soon as possible, and timely pruning, control, pest control and pest control. After the flood disaster, clean up and dredge the drainage system in time to eliminate water accumulation; timely cultivating loose soil, increase the use of quick-release fertilizer to prevent premature decompensation, and timely control of pests and diseases.
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