Deep ploughing, fine hoeing and irrigation in winter are both important measures for increasing cotton yield and an effective method for eliminating winter cotton bollworm.
1. Deep ploughing in winter. Helicoverpa armigera usually grows over 2.5 to 6 cm (up to 9 cm deep) from the ground. Winter ploughing can destroy the diverticulum, change the natural state of the corpus callosum, and reduce the rate of emergence of the sacred spring. The surface is allowed to die, freeze, or be eaten by natural enemies; some of the insects can be turned into the deep layers of the soil so that they cannot be properly emerged and suffocated, thereby reducing the source of overwintering insects. The earlier the winter ploughing time, the better, before the land is frozen (more than 5 cm in the frozen soil layer), to extend the weathering time, improve the insecticidal effect, and help to accept more rain and snow. The depth of ploughing should be above 10 cm; the deeper the winter ploughing, the better the pest control effect. It should be noted that due to the strong flying ability of cotton bollworms, winter ploughing and pest control must be carried out in large areas to be effective; in addition to the reserved cotton white sorghum, wheat field arable crops, orchards blank, etc., must also be winter ploughing.
2. Combine farming. Before the winter ploughing, smash it again. After ploughing and then smashing it, you can store water and keep it, and you can kill some wintering insects. According to the survey, the winter ploughing of cotton fields can kill 76% to 85.6% of cotton bollworm mites. After winter ploughing, cockroaches are buried deep in the soil, which can reduce the survival rate by 86.4% to 92.5%.
3. Irrigation after ploughing. Winter ploughing followed by winter irrigation not only can solidify and weather the soil, but also increase the mortality rate of wintering crickets. According to some data, the wintering rate of winter ploughing and winter irrigation is about 80% for the cotton bollworm, and the winter mortality rate is only 60% to 70% for the plots that are not irrigated, and only 30% for the plots that are not irrigated or not. 40%.
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