At present, the popularization rate of the use of biological pesticides is continuously increasing, and biological pesticides should pay attention to several aspects in the production practice: 1. Familiar with the biological characteristics of biological pesticides The biological characteristics of biological pesticides refer to the scope of application of the pesticides, their function, Effectiveness and mechanism of action. For example, S. suis, S. elegans, D. tremors, etc., all of which are active ingredients of Bacillus thuringiensis, have a toxic effect on Lepidoptera larvae and have no effect on fleas, mites and ticks. It is stomach poisoning. The mechanism of action is that the dead body can also infect other insect pests that have not been exposed to pesticides. The common characteristics of biopharmaceuticals are characterized by low toxicity, no residue, slow action, and long duration of efficacy. The matching concentration and the use dose are lower than the chemical precision. When the dose is slightly larger, it will not cause phytotoxicity to plants, and it will be safer for humans and animals, and it will not pollute the environment. Second, scientific mixed biological agents science mixed biological agents can improve the control effect. When you use it, read the instructions in detail and use it with your device. Pesticides should be used up once. Such as Beauveria bassiana, with a good pesticide to be sprayed in two small days in order to avoid early spore germination, loss of effectiveness. For biological insecticides can be mixed with most chemical insecticides, because most of the chemical insecticides are chemically acidic, physiologically neutral, no killing and neutralization reactions against bacteria and fungi. Therefore can be fully mixed. It can be seen that the biopesticide can not be mixed with the chemical bactericide once it is mismatched. The active bacterial spores of biopharmaceuticals will be killed and lose their due potency; for most biological fungicides, they can be mixed with most chemical agents and biopharmaceuticals, but they cannot be mixed with basic drugs. Trichoderma agents, for example, can be mixed with most biocides and chemical pesticides at the same time. Third, scientific understanding of the temperature of pesticide application of biological pesticides should be controlled at about 20 °C -30 °C. The active ingredients of biological pesticides consist of protein crystals and living spores. Under low temperature conditions, spores grow slowly in insect pests, protein crystals are difficult to perform, and control effects are poor. According to tests, Beauveria bassiana, Bacillus thuringiensis and other biological pesticides. Spray at a temperature of 25°C to 30°C. The insecticidal effect is 1-2 times higher than at 10°C-15°C. Fourth, scientific understanding of the use of drugs biological pesticides in the spores hi humid environment, so the greater the humidity when used in the field, the higher the efficacy. In general, spraying is best in the morning and evening, especially powder pesticides have better efficacy. Since there is dew in the morning and evening, the medicament can adhere to the stems and leaves very well, and the spores will multiply quickly. As soon as the insect pests feed on the stems and leaves, they will soon die, and the efficacy and control effect can be improved. If you spray at high temperatures at noon, direct sunlight. Ultraviolet rays in strong sunlight can kill spores. In direct sunlight for 0.5 hours, the mortality rate of spores reached 50 or so, direct l-hour exposure, and the mortality of spores reached 80%. In addition, the ultraviolet radiation will deform the spore crystals, which will greatly affect the use effect. Therefore, the application of biological pesticides should preferably be performed in the evening or on cloudy days. However, we must grasp the weather changes, in addition to choose sunny days and mornings, cloudy days or after the rain to spray fine spray, try to avoid heavy rain, heavy rain will wash away the bacteria and lose their lethality. Such as light rain after 5-6 hours after application, is conducive to spore germination, not only will not reduce the efficacy, but will increase the pest control effect. Fifth, the scientific method to use because most of the biological pesticides without systemic absorption, spraying the first one should pay attention to uniform spraying can play a good effect. Such as Beauveria bassiana, the bacteria must be evenly sprayed on the pests, bacteria continue to multiply, gradually destroy the physiological function of pests, and ultimately make the pest metabolic disorders and death. When used on dry land crops, it is necessary to spray the liquid as much as possible so that each part of the plant is sprayed with spray and sprayed to prevent leakage, so as to achieve the purpose of prevention and control. The second is the slow effect of biological pesticides. It should be used during the young larvae of pests. Many silicon pesticides have a slow insecticide effect and are inferior to chemical pesticides immediately after spraying. Therefore, they should be used 2 to 5 days earlier than chemical pesticides. Such as BT emulsion, Beauveria bassiana, Bacillus thuringiensis, etc., they are slow to sterilize, generally after spraying, pests 3-5 days gradually died. Third, the location of storage of biological pesticides requires a cool, dry place, and avoid moisture. Such as Bacillus thuringiensis, Jinggangmycin, gibberellin and so on. Their characteristic is that they are not resistant to high temperatures and lama. It is easy to absorb moisture, lose its effectiveness, and its shelf life cannot exceed 2 years.
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