Biopesticides are not "natural"

The development of biological Pesticides cannot be separated from chemical means.

Biopesticides are part of pesticides and their development cannot be separated from the overall development of pesticides (chemical pesticides). The biological pesticide mentioned here refers specifically to biologically-sourced pesticides. Its development cannot be separated from chemical means, but its most promising development is the dissolution into chemical pesticides.

If biopesticides (plant sources, microbial products) are viewed as "natural," "non-toxic, pollution-free" and "original" to promote, there is a potential problem and there will be no greater development. . The famous biological pesticide expert Shen Yuchu, an academician of our country, once wrote that: “The highly toxic substances and carcinogens produced by organisms have a wide range of species. In the research and development of biological pesticides, they must adhere to the same standards as chemical pesticides, because their essence is Chemicals.” As we all know, as a Chinese herbal medicine for treating diseases, there is also the saying “taking poison to attack poison”. Not that all the mushrooms and wild herbs can be eaten. In the course of research and development of agricultural antibiotics in China, there are many screening materials with excellent efficacy, and it is because of safety issues that development has to be stopped. In some developed countries in Western Europe, the use of antibiotics and microorganisms in agriculture has remained cautious. They are concerned that residues will enter the human body and will cause difficulties in the prevention and treatment of intestinal diseases. They also fear that it will be difficult to cause environmental microbial community imbalances. Remediation of environmental pollution.

The primary reason why many biopesticides have not been able to achieve greater development in decades is that their efficacy is not high and they cannot be compared with chemical pesticides that are often opposed. Followed by instability, because it is not resistant to storage, rapid decomposition of light in the field and other reasons, only the current system and difficult to scale. The limited natural resources also make it difficult for plant sources, especially animal-derived pesticides, to develop. Different growth areas, different collection periods, active ingredients are also different, it is difficult to make high concentrations and a variety of formulations, the use of inconvenience, the cost is not low. Only a variety of bio-pesticides, which are rich in available resources and can use chemical means for industrial production, have received much attention.

At present, animal-derived pesticides have been successfully replaced with tussah venom, and other applications such as medical scorpion venom and tetrodotoxin are still in the research stage. Nereistoxins are difficult to culture in live silkworms, but their chemical structures are simple and can be synthesized artificially. After the bionic transformation, the activity has been greatly improved. For example, the killing dan, Insecticide double (single), etc. have become important medicines for controlling rice borers, leaf miners, and the like, and their safety is superior to that of scavengers.

In plant-derived pesticides, natural pyrethrin (pyrechin) is one of the most successful examples of bionic transformation. The emergence of photo-stabilized permethrin led to the prevention and control of pyrethroids and the use of deltamethrin as a marker to make insecticides enter the ultra-efficient era. A series of halogen-containing, cyano-containing and stearyl-containing pyrethroids have opened up a new era of pesticides with far greater safety and efficacy than natural pyrethroids. This has caused Japan to stop the cultivation of large-scale insect chrysanthemums; although some plants are grown in Africa, they are only used for the preparation of mosquito coils and health aerosols, and chemical synergists are added. The costs are higher than those for artificial synthesis. Kill pyrethroids of mosquitoes and flies.

In recent years, imidacloprid biomimetics such as neonicotinoids have written a brilliant page for the transformation of natural pesticides. In particular, eucalyptus (the main component of fenghuang essence) is used to imitate cycloheptazone, and myrna spermone mimics superior herbicides such as sulcotrione, nitropone, and SB-500, which are natural product development demonstrations. A vast world.

In summary, biopesticides are essentially chemical pesticides. They should be regulated according to the management methods of chemical pesticides. They must not be “natural” to produce raw materials, and should not limit biopesticides to a small circle. Biological pesticides, especially plant-derived pesticides and microbial pesticides, are important precursors for the creation of new pesticides. Although pesticide workers synthesize tens of thousands of new compounds and microbial biomass, they are insignificant in the biochemical synthesis of nature. There is no benefit to using biological pesticides and chemical pesticides. It is only a chemical perspective to research and develop biological pesticides. Combining biological technology with chemical means can only be regarded as high-tech. It is the broad road to the development of pesticides in China.

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