With the continuous improvement of living standards, pollution-free vegetables have taken people's table. The use of natural enemies of insects in the prevention and control of vegetable pests and diseases not only reduces the harm of toxic and harmful substances to the human body, but also helps maintain the ecological balance and the development of the green food industry. The technical points are as follows:
One is the use of Trichogramma to control cotton bollworm, tobacco budworm and cabbage caterpillar. Trichogramma parasitic parasite eggs. In the spawning season of pests, the bees were placed with 10,000 bees per acre, bees were placed every 5 to 7 days, and bees were continuously released 3 to 4 times. The parasitism rate was about 80%.
The second is to control the whitefly in the greenhouse with the citron. The parasite is parasitized in the nymphs and crickets of whiteflies. After parasitism, the pests become black and die. When the tomato has a whitefly 0.5 to 1 head release lissock wasp. When there are 5 black locusts per plant, the bees are fed once every 10 days. For three consecutive bee preventions, the parasitism rate was above 75%.
The third is the prevention and cure of peach aphid and cotton aphid with tobacco aphids. Per square meter of sweet peppers or cucumbers in the sheds, 12 stings of parasitism were released. At the beginning of the locusts, they began to put on their own. Bees were fed once every 4 days, and beelets were released 7 times. Within 45 days after the bee was released, the sweet pepper had a pod rate of 3% to 15%. The effective control period was 52 days. The cucumber had a pod rate of 4% or less. The effective control period was 42 days.
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