Microbial pesticides also belong to the category of biological pesticides. They are a class of pesticides that control bacteria, insects and weeds by living microorganisms such as bacteria, fungi and viruses, and do not include all kinds of agricultural antibiotics. Microbial pesticides also have the advantages of low toxicity, biosafety to natural enemies, and environmental friendliness. They are the preferred pesticide varieties for the production of pollution-free agricultural products. China Pesticide Network Xiaobian introduces you to the specific types of biological pesticides:
1. Viral microbial pesticides Currently, 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.
(2) Polymorphic virus. Sprayed on plants, after being eaten by insects, round virions form in the cytoplasm of insects, and infected insects die for about 10-20 days.
(3) Granular virus. Sprayed on plants, eaten by insects, and died about 4-5 days.
2. Fungi-like microbial pesticides (1) Beauveria bassiana is also a kind of microbial pesticide which is widely used, and can be used for controlling various pests such as whitefly, whitefly, cockroach, etc. It is very suitable for the prevention and control of pests.
(2) Trichoderma can be used to control cucumber gray mold and downy mildew, watermelon blight and bacterial wilt.
3. Bacterial microbial pesticides (1) Bacillus thuringiensis (Bt) 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 Various lepidopteran pests such as tea caterpillars, tea mites, cotton bollworms, corn borers, and apple nest moths.
(2) Bacillus polymyxa can be used to control tomato, pepper and eggplant bacterial wilt.
(3) 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.
It is understood that the microbial pesticides based insecticide, Bacillus thuringiensis fungi (of Bt), bacteria and viral agents are Beauveria bassiana against lepidopteran insects, in particular, only a small portion is For diseases, such as Bacillus in bacteria and Trichoderma in fungi.
Metal silicon, also known as Crystalline Silicon or Industrial Silicon, is mainly used as an additive to non-ferrous based alloys. Metal silicon is a product made of quartz and coke in an electric furnace. The content of silicon in the main component is about 98% (in recent years, 99.99% of Si is also contained in metal silicon), and the remaining impurities are iron and aluminum. , calcium, etc.
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