With the advancement of modern bio-engineering technology and the increase in the commercial production level of biological products, bio-pesticides have become more widely used in agricultural production in recent years, and have received good results. However, due to the inadequacy of propaganda and popularization work, in particular, there are still some marketers lacking a comprehensive understanding of biological pesticides, or knowing little about them, which has exposed some new problems in the promotion process of biological pesticides. Some believe that the use of biological pesticides can eliminate the use of chemical pesticides, or that the era of chemical pesticides is over, the biological pesticides and chemical pesticides are opposed; some believe that the application of biological pesticides can not be called food pollution-free food , One-sided emphasis on the role of biological pesticides; Some believe that biological pesticides are good, that is, slow effect, poor visual effect, leaving an impatient impression of farmers eager to prevent pests and diseases; some farmers to biological agents efficient Bt and fungicides Or the mixture of acidic solution mixed, so that loss of control effect. All of these hinder the healthy and orderly promotion of biological pesticides. Therefore, it is necessary to have a comprehensive understanding of biological pesticides and to master the correct use of technologies. First, we must see the advanced nature of biological pesticides. Relevant experts asserted that the bio-pesticide technology in the 21st century will be hot in the world and the network economy will inevitably be a bio-economy. Biological pesticides are one of the earlier scientific and technological achievements in the development and application of bioengineering technologies. The application of our country started in the late 1950s and early 60s. There are many contents of biological pesticides, including microbial pesticides, biochemical pesticides, genetically modified organisms, natural enemies, and plant-derived pesticides. The use of biological pesticides can kill a variety of diseases and pests, the second can produce pollution-free green food, three can reduce the pollution of the environment, ensure the safety of humans and animals, four can protect natural enemies, and fifth, pests and diseases are not easy to produce resistance. According to the statistics of the Ministry of Agriculture, there are 77 varieties of biological pesticides registered in China, accounting for 13.4% of the active ingredients; 691 products, accounting for 7.1% of registered pesticide products; production of nearly 100,000 tons of preparations; 400 million mu times. Of course, biopesticides are only one component of pesticides and they cannot replace chemical pesticides. They need to be further developed to improve the application level. Second, we must understand the mechanism of biological pesticides. Biological pesticides have a gradual process of poisoning of pests, such as high-efficiency Bt, paralysis of pests first, and then destruction of the internal organs to death, which takes 1-3 days. For example, an insect virus is a nucleic acid of a virus particle that enters the insect body and absorbs nutrients from the insect body, resulting in the disintegration of the cell tissue. It takes 3-5 days. For example, the effect of Jinggangmycin on pathogenic bacteria is to hinder the binding of the amino acid of cell wall palpebra and make the mycelium produce abnormal branches. Although the visual effect of biological pesticides is slower than that of chemical pesticides, the pest-infesting function of pesticides has been inhibited or existed in name only. Therefore, it must be rationally applied according to the characteristics of these pesticides. Third, the correct application of biological pesticides. The first is to strictly apply the biological pesticides several days in advance according to the forecast of pests and diseases in the local plant protection department; the second is to strictly adhere to the application dose and not to increase or decrease the concentration arbitrarily; the third is to improve the control efficiency and safety performance. Some low-toxic chemical pesticides are mixed to minimize the pollution of highly toxic pesticides. However, high-efficiency Bt is forbidden to be mixed with bactericides and acidic solutions, and it cannot be used in mulberry fields. Fourth, biopesticides should not be exposed to sunlight or moisture; the fifth is to select sunny afternoon medication or cloudy use, and the drug should be sprayed once in case of rain. .
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