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There are tricks for using biopesticides
With the increase of people’s environmental awareness and health awareness, people are increasingly fond of “green†foods. Therefore, the correct and efficient use of biological pesticides has attracted more and more attention. At present, biological pesticides have been widely promoted and used in field crops, vegetables, fruit trees and flowers. However, due to the effects of biological pesticides are often affected by many factors, we should make full use of its favorable factors in practical applications to overcome and avoid unfavorable factors to maximize the effectiveness of biological pesticides. First, see the use of biological pesticides due to environmental factors. Therefore, in practical applications, it takes a certain period of time for the biological pesticides to be sprayed from the plants to the insects to feed on or contact with the bacteria, and it takes a course from the pests to feed them to death, and is susceptible to external influences during this period. The most influential factors are temperature, humidity, light and wind. The temperature not only acts on the spores of the biological insecticide, but also acts on the pests themselves, thereby affecting the pathogenicity and toxicity of the pathogenic microorganisms; the humidity has a direct relation to the propagation and spread of the bio-insecticide spores, high humidity, and microbial spore reproduction. Diffusion is fast, easy to infect and kill pests; ultraviolet rays in the sun have a lethal killing effect on spores, so it should try to avoid strong light when it is applied, such as better after 4 pm, the effect of wind on biological pesticide drift Diffusion plays a vital role in the application of powders under the breeze. Second, look at different regions, the use of biological pesticides are not the same effect. Our country has a vast area and a large regional diversity. The south is wet and rainy. The northern and western regions are arid and dry. Biocides can play their biggest role only if they meet the best conditions for their lives. On the one hand, increasing the amount of water used for spraying in arid regions results in a high-humidity environment, which makes it easier for the survival and reproduction of microbial spores; on the other hand, certain specific macromolecules and substances that increase the viscosity of the solution can be added to the preparations. Such as starch, animal bone glue, grass ash leachate, etc., this can reduce the evaporation of the carrier sprayed deposition solution, thus avoiding the occurrence of rapid drying, thereby increasing the use of biological pesticides. Third, pests and insect pests are the targets of biological pesticides. For different types and characteristics of pests, the use of biological pesticides are also different. The pests have several different stages of development in their lifetime. The resistance to biopesticides is different at each stage of development. Therefore, understanding the stage of development of the pests is essential for prevention and control. For example, cabbage caterpillar can be divided into four different development stages: eggs, larvae, cockroaches, and moths. Eggs are protected during the egg stage, carcasses are protected during the pupal stage, and the older larvae are protected by thicker waxy layers. Wings are flyable. Therefore, the effects of biological pesticides can only be brought into full play if only the young larvae are selected for application, so as to meet the requirements of “small governance, early treatment, and treatmentâ€. In addition, different types of bio-insecticides should be used according to the pest feeding characteristics. For example, BT is effective against lepidopteran pests and spreads on the surface of plants after spraying, causing pests to feed or die, but it is also effective for sucking juice. Insects (such as acarids) are ineffective, and abamectin has a very good effect on aphids. Fourth, to see the mechanical biological pesticides In practical applications, most of the spray system efficiency is very low, usually directly from top to bottom on the crop application, resulting in a large number of pesticides are concentrated on the top of the crop leaves, other pesticides are lost in the soil In particular, when the mist is large, the loss is even greater. At the same time, due to the high production costs of biological pesticides, the use of drug technology should be optimized. The use of high-performance spraying machinery is imperative. For example, with mist spraying, the droplets ejected by the hydraulic nozzles associated with the fan-shaped air nozzles are small and uniform, so that the latent droplets of the spray can be reduced and the smaller droplets can be sprayed to the expectation. Target leaves, thereby improving the effectiveness of biological pesticides, reduce production costs. V. The control effect of pharmaceutical bio-pesticides is often closely related to the dosage form and the use technology. Therefore, the use of biological pesticides must be based on the control of objects, weather conditions and the use of time, the right choice of the appropriate dosage form, in order to achieve the maximum control effect. For example, powders can be dispersed in a wide range by means of air buoyancy and wind force, thereby providing greater contact with pests. For pests with a large amount of leaves, such as cabbage caterpillar, spraying of a wettable powder with water can be used. Better, but the use of dusting effect is worse. Capsules not only have a longer control effect, but also protect pathogens from environmental factors and can be used for spreading in greenhouses. VI. Looking at the varieties In the actual use of biological pesticides, many people do not fully understand the nature of biological pesticides, mistakenly assuming that biological insecticides can eliminate all pests and thus purchase them indiscriminately. Actually, this is not the case. Not only will not receive the desired results, increase production costs, increase the difficulty of prevention, but also delay the prevention and treatment. In fact, the specificity of biopesticides is very strong, and their insecticidal spectrum is not broad. For example, Bacillus thuringiensis (BT) is effective in controlling Lepidoptera larvae, but it is not fatal to the leafhoppers of the same order, and Bacillus thuringiensis Different strains have different effects on the control of several important pests. Therefore, targeted biopesticides should be targeted for different target pests. VII. Based on the characteristics of the pests' migratory movements In the actual use of biological pesticides, the use of biological pesticides combined with high-efficiency, low-toxicity and low-residue chemical pesticides should be adopted according to the characteristics of the pests due to the migration characteristics, because low-dose biological pesticides should be added. Chemical pesticides can reduce the resistance of pests and create conditions for the invasion of pathogenic microorganisms. At the same time, pests are invaded by pathogenic microorganisms, which in turn reduces the resistance to chemical pesticides, so that the two complement each other and thus play a synergistic role.