The cabbage butterfly is also known as cabbage butterfly and white butterfly. The larva is called cabbage caterpillar. It is one of the main pests of cruciferous vegetables, especially the cabbage-type vegetables. Hazardous larvae feed on the leaves and the discharged feces contaminate the leaves and leaves. The soft rot is easily induced in the event of rain. The suitable temperature is 20°C-25°C, and the relative humidity is about 76%. Generally the most serious damage in spring and autumn, when the weather is cool, which is conducive to its occurrence. Biological control uses 1.8% of Avedine EC 3000-4000, or 0.9% of ECDF 2000-3000, or of 500-800 times of Bacillus thuringiensis emulsion, or 1000 times of Bacillus thuringiensis to control larvae. Self-prepared biological pesticides can also be used for prevention and control: that is, in the hazardous season of Pieris rapae, the infected cabbage butterfly larvae can be collected in the field and then made into a venom. Methods for the identification of susceptible larvae: Pieris rapae larvae fed on leaves with granulosa virus did not have obvious symptoms at the initial stage, and gradually showed signs of illness. The body color changed from greenish green to yellowish white. After the onset of the disease, the larvae no longer molt, the body segments are swollen, and they die. Diseased corpses shed yellow-white, odor-free body fluids. Dead larvae often hang upside down or "eight-shaped" suspensions on leaves, and they are attached to the leaves. The collected diseased larvae were smashed and added with water in a dish and served as a cabbage pink granule virus solution. If the solution is stored in a refrigerator (temperature controlled at about 7°C), the virulence does not decrease after being stored for one year. Self-made biopesticides can be used in the development of cabbage larvae 1-3 instars with good control effect. For different vegetable varieties, the number of prevention and control is different. Generally, cabbage is sprayed 1-2 times from planting to harvesting; kale is sprayed 3-4 times from planting to harvesting, with intervals of 10-15 days. Use 10-30 five-year-old corpses of 3-5 grams per acre, mash 37-50 kg of water spray control.
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