Eradication of pests is a matter of the busy season for farmers. Winter ploughing, fine hoeing, and irrigation are both important measures to ensure the increase of cotton production in the coming year, and are also effective ways to eliminate overwintering bollworms.
Winter plowing bollworms generally spend more than 2.5 to 6 centimeters from the ground to pupate overwintering. Winter plowing can damage the diverticula and reduce the emergence rate of pupal springs. Some pupae are turned to the surface to make them dry, frozen or eaten by natural enemies. Or, some insects will be turned into the deep layer of the soil so that they cannot be normally feathered and become suffocated. The sooner the winter plowing time is, the better the plowing will be before the land is frozen to prolong the weathering time, improve the pest control effect, and help to accept more rain and snow. Plowing depth should be more than 15 cm. The deeper the winter plowing, the better pest control effect. Due to the strong fly ability of adult Helicoverpa armigera, winter plowing and disinfestation must be conducted in large areas to be effective.
Combine plowing with ploughing before winter plowing, plowing and then smashing and smashing, you can store water, and can kill some of the overwhelming insects.
Post-cultivation irrigation and winter ploughing followed by winter irrigation or spring irrigation can not only sink and weather the soil, but also increase the overwintering mortality.
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