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Overwintering cotton to eliminate pests
From the harvest of cotton until the second year of sowing, it is the wintering period of cotton pests and diseases. During this period, cotton pathogens and pests are hidden in winter and dormant in various places. Grasping the favorable opportunity for the wintering period to prevent and control can reduce the number of pests and diseases in the coming year, and it can achieve a multiplier effect. 1. Clean the pastoral. Cotton bollworms, red spiders, aphids, blister-like bugs, anthracnose pathogens, blight pathogens, etc., can overwinter on dead branches, fallen leaves, rotten bells, and weeds left in the cotton field. Thoroughly removing dead branches, fallen leaves, and rotten bells and eradicating weeds in and around the field can effectively eliminate overwintering pests and diseases. Clearing materials should be buried in time and avoid accumulation on the field side. 2. Deep plowing irrigation. Cotton bollworms, ground tigers, and tawny moths spend winters in the soil and can be killed by deep plowing irrigation measures. This method has significant control effect, and the death rate of Helicoverpa armigera can reach more than 90%. Deep plowing depth of 30-40 cm, turning the topsoil to the bottom, the subsoil turned to the top. The winter irrigation should be carried out on the 39th day. Generally, the amount of irrigation water per mu is 80-120 cubic meters, and the clay field should be filled with some more. The method of furrow irrigation is better, and avoid flood irrigation. 3. Pharmacy fumigation. Various pests, such as anthracnose, carrageenan, red rot, and red bollworm, can adhere to the inside and outside of the seed for winter. The storage warehouse can be sealed and 32-37 grams of bromine methane can be smoked and killed in each cubic meter of space. After 3 days of confinement, 98% of the red bollworms and some pathogens can be killed. The cotton seeds can also be soaked in hot water (about 65 degrees Celsius) and the insecticidal bactericidal effect is also good. The larvae of cotton bollworms mainly survive in the gaps between the four walls of the storage warehouse of the cotton and the gaps of the sun-winning storage tools. Therefore, the walls in the warehouse can be sprayed with lime slurry to fill the gaps before storing the cotton. 50% of dichlorvos emulsion was sprayed on the wall surface 100 times, then put cotton, seal the doors and windows, kill the red bollworm.