Biocontrol cabbage butterfly technology

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 leaf meat, and excreted fecal matter contaminates the leaves and leaves. It is easy to induce soft rot in the event of rain. The optimum temperature is 20°C to 25°C, and the relative humidity is about 76%. It is generally the most hazardous in spring and autumn, when the weather is cool, easy to happen.

The biological control uses 1.8% of EDT for 3000-4000 times, or 0.9% of EDT for 2000-3000 times, or 500-800 times of S. eugenicus emulsion, or 1000 times of spraying of nymphella sp. . Can also be self-made biological pesticide control. In the hazardous season of Pieris rapae, the infected cabbage butterfly larvae can be collected in the field. Methods for 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 yellow-white. After the onset of the disease, the larvae no longer molt, the body segments are swollen, and they die. The diseased corpse shed yellow-white odor-free body fluids. The dead larvae often hang upside-down or "eight-shaped" suspension on the leaves, and they also attach 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 bio-pesticides were applied at the peak of development of Pieris rapae larvae from 1 to 3 years old. The control effect was good. Different vegetable varieties have different numbers of prevention and control. The cabbage is usually sprayed 1 to 2 times from the time of colonization to harvesting; Kale is sprayed 3 to 4 times from the time of colonization to harvesting, with intervals of 10 to 15 days. 10 to 30 five-year-old diseased corpses per acre 3 to 5 grams, smashed water 37 to 50 kg spray control can be.

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