Biological pesticides and their species

Biological pesticides are biologically active substances produced by biological living organisms or biological metabolic processes, or substances extracted from biological organisms, as pesticides for controlling agricultural and forestry crop diseases, insects, grasses and rats.
In nature, organisms include animals, plants, and microorganisms. After long-term research by scientists and technicians, it has been found that parasitic and predatory insects in animals, such as parasitic wasps and predatory ladybugs, can be used to control pests by artificially assisting or indoor breeding. Insect pests, they play a role in the control of pests. Some insects use their own sex pheromones to lure other pests, which is conducive to concentrated annihilation and also plays a role in pesticides. Therefore, such living insects are called animal biological pesticides, such as Trichogramma, larvae, insectivorous ladybugs, grasshoppers and the like.
Many species in plants contain pesticidal ingredients, such as tobacco containing nicotine, leguminous plants containing rotenone, and Compositae pyrethrum flowers containing pyrethrin. After industrial extraction, it can be used as a pesticide, that is, a plant-derived bio-pesticide. This ancient Chinese working people used this method to control pests very early. For example, as early as the 7th and 5th centuries BC, Chinese farmers used plants such as alfalfa to control pests. It is the first country in the world to use plant-derived pesticides. There are many kinds of plant-derived biological pesticides, which have broad development prospects.
Microorganisms include bacteria, fungi, actinomycetes, viruses, microsporidia, and the like. Some of them use their own invasive ability to kill pests. For example, Bacillus thuringiensis has 12 serotypes and 17 varieties. It has a killing effect on more than 300 kinds of Phosphorus pests such as vegetables, fruit trees, cotton, rice, corn, tea trees, forests, etc., and has the advantages of high efficiency and no pollution to the environment. Some use their metabolites to kill pests or germs. For example, the Liuyang cultivar, a gray actinomycete isolated from the soil of Liuyang, Hunan Province, produces the metabolite of yangyangmycin, which kills mites and becomes a famous antibiotic acaricide. Another example is the non-water-absorbing Streptomyces wuyi variety isolated from the soil of Wuyishan, Fujian Province, China. The fermented metabolite Wuyishancin can kill a variety of fungi and bacteria and become an excellent antibiotic bactericide.

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