The future development of vegetable production, the use of microbial pesticides will become a trend. Microbial pesticides have become the preferred pesticide varieties for the production of pollution-free green vegetables due to their strong specificity, low toxicity, biosafety to natural enemies, and environmental friendliness. It is understood that the microorganisms commonly used in greenhouse vegetable production include the following three categories:
The first is the bacterial microbial pesticide Bacillus thuringiensis is currently the most widely used variety, accounting for the vast majority of all microbial pesticide use, can be used to control Plutella xylostella, Pieris rapae, beet armyworm, Spodoptera litura, tea caterpillar, tea A variety of lepidopteran pests such as the cockroach, cotton bollworm, corn borer, and apple moth.
Bacillus polymyxa can be used to control tomato, pepper, eggplant bacterial wilt, yellow wilt, anthracnose, disease, soft rot and the like. The test results show that Bacillus polymyxa has two major functions: 1. It can effectively control the bacterial and fungal soil-borne diseases of plants by root irrigation, and can significantly reduce the bacterial and fungal diseases of plant leaves; 2. It has obvious growth-promoting effect.
Bacillus subtilis can be used to control cucumber powdery mildew, strawberry powdery mildew and gray mold, etc. It can also be used to regulate the growth of vegetables and increase the yield.
The second category is viral microbial pesticides.
At present, there are more than 300 kinds of viruses that are pathogenic to insects, and more than 200 lepidopteran pests can be infected with viruses. There are three commonly used viruses:
1. Nuclear polyhedrosis virus. Sprayed on plants, eaten by insects, digested by gastric juice, frees out baculovirus particles, enters the body cavity through the stomach (intestine) skin cells, and replicates and proliferates in the nucleus of insect cells. The infected insects die within about 10 days. For example, Spodoptera litura nuclear polyhedrosis virus can be used to control various crops of Spodoptera litura, such as cruciferous vegetables.
2, the shape of polyhedrosis virus. Sprayed on plants, after being eaten by insects, round virions are formed in the cytoplasm of insects, and infected insects die in about 10-20 days.
3. Granular virus. Sprayed on plants, eaten by insects, and died about 4-5 days. For example, Plutella xylostella granulosis virus can be used to control the cruciferous vegetable Plutella xylostella.
The third type is fungi-based microbial pesticide Beauveria bassiana, which is also a kind of microbial pesticide which is widely used. It can be used to control a variety of pests such as whitefly, whitefly, cockroach, etc. It is very suitable for the prevention and control of pests. Similar to the same type are Metarhizium, Beauveria bassiana and the like.
Trichoderma can be used to control cucumber gray mold and downy mildew, watermelon blight and bacterial wilt. It can eliminate the plaque bacteria and pests, improve the soil, break the knot, improve soil permeability and root oxygen supply, and inhibit a variety of plant fungal diseases, such as root rot, blight, stagnation, blight, etc. Soil-borne diseases. Trichoderma has a certain effect on the control of root-knot nematodes. More famous are Trichoderma harzianum, green Trichoderma and so on.
Pesticide manufacturers remind everyone to understand the characteristics and mode of action when using these microbial pesticides, so as to avoid adverse effects caused by improper use.

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