As people's awareness of environmental protection and health awareness increase, people are increasingly fond of "green" food. Therefore, the correct and efficient use of bio-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, since the use effect of biological pesticides is often affected by many factors, we should make maximum use of its favorable factors in practical applications, overcome and avoid adverse factors, and maximize the control effect of biological pesticides. First, look at the use of biological pesticides due to the impact of environmental factors. Therefore, in practice, it takes a certain time for biological pesticides to be taken from plants to insects to feed or contact with bacteria, and it takes a process from feeding pests to death, which is susceptible to external influence during this period. The most influential factors are temperature, humidity, light and wind. Temperature not only acts on biological insecticide spores, but also on the pest itself, thus affecting the pathogenicity and toxicity of pathogenic microorganisms; humidity has a direct relationship with the propagation and spread of biocide spores, humidity, microbial spore reproduction and Rapid diffusion, easy to infect and kill pests; ultraviolet rays in the sun have a lethal killing effect on spores, so try to avoid strong light when applying, such as better use after 4 pm, wind-to-powder bio-pesticide drift And diffusion has a vital role, the application of powder under the breeze, the best effect. The use of biopesticides varies from region to region. China has a vast territory and large regional differences. The south is humid and rainy, and the north and west are dry and rainless. Biological pesticides can only be most effective when they meet the best conditions for their lives. On the one hand, it is necessary to increase the amount of sprayed medicinal water in arid areas, resulting in a high-humidity environment, which is easy to survive and multiply microbial spores; on the other hand, it can add some specific high molecular substances and substances that increase the viscosity of the solution. Such as starch, animal bone glue, grass ash leaching solution, etc., this can reduce evaporation in the deposition solution sprayed by the carrier, thereby avoiding the occurrence of rapid drying, thereby improving the use effect of the biological pesticide. Third, see the insect Pests are the target of biological pesticides. For different types and characteristics of pests, the use of biological pesticides is also different. There are several different developmental stages in the life of the pest, and the resistance to the biological insecticide is different at each development stage. Therefore, it is necessary to understand the development stage of the pest. For example, the life cycle of the cabbage caterpillar can be divided into four different developmental stages: egg, larva, cockroach and moth. The egg stage is protected by egg shells, and the larvae are protected by the corpus callosum. The old larvae have thicker wax layer protection. Winged to fly. Therefore, only when the application of the young larvae is selected, the effect of the biological pesticides can be fully exerted, thereby achieving the requirements of "treating the disease, treating the disease early, and treating it". In addition, different types of bio-insecticides should be used according to the feeding characteristics of pests. For example, BT has a good effect on lepidopteran pests. It is distributed on the surface of plants after spraying, so that the pests feed or touch the medicine, but they suck the juice. Insects (such as mites) are ineffective, and avermectin works very well on aphids. Fourth, look at the machinery In practical applications, most spray systems are very inefficient, usually applied directly from the top to the bottom, causing a large amount of pesticides to accumulate on the top leaves of the crop, and other pesticides are lost in the soil, especially When the fog is large, the loss is even greater. At the same time, due to the high cost of biopesticide production, the drug technology should be optimized. It is imperative to use high-performance spraying machinery. If sprayed by mist, the nozzles sprayed with the fan-shaped air nozzles will be small and uniform, which will reduce the potential drift of the spray and make the smaller droplets spray to the expected. Target leaves, thereby improving the efficacy of biological pesticides and reducing production costs. Fifth, see the dosage form The control effect of biological pesticides is often closely related to the dosage form and use technology. Therefore, when using biological pesticides, according to the control object, meteorological conditions and the period of use, the correct dosage form should be correctly selected to achieve the maximum control effect. For example, the powder can be dispersed in a wide range by means of air buoyancy and wind, so that it has greater contact with pests. For pests with a large amount of edible leaves, such as cabbage caterpillar, a method of spraying a wettable powder with water to form a suspension can be used. Ok, and the effect of using the dusting method is worse. Capsules not only have a long-term effect, but also protect the pathogens from environmental factors, and can be used in greenhouses. Six, look at the variety In the actual use of bio-pesticide, many people do not fully understand the nature of bio-pesticide. They mistakenly believe that bio-insecticides can kill all pests, so they choose to use them indiscriminately. In fact, this will not be acceptable. Some effects, increase production costs, increase the difficulty of prevention, but also delay the prevention period. In fact, biocides are highly specific and have a poor insecticidal spectrum. For example, Bacillus thuringiensis (BT) is effective against lepidopteran larvae, while it is not fatal to the leafhoppers of the same wing, and Bacillus thuringiensis There are also differences in the control of several important pests in different strains. Therefore, suitable biopesticide varieties should be selected in a targeted manner for different target pests. 7. According to the migration characteristics of pests In the actual use of bio-pesticide, according to the migratory characteristics of pests, bio-pesticide should be used in combination with high-efficiency, low-toxic and low-residue chemical pesticides, because the addition of low-dose chemical pesticides to bio-pesticide can reduce the resistance of pests. Force, to create conditions for the invasion of pathogenic microorganisms, while the pests are infected by pathogenic microorganisms, and reduce the resistance to chemical pesticides, so that the two complement each other, thus playing a role in synergy. Below Steel Structures Building Steel Structure,Steel Structure Warehouse,Steel Warehouse Fenghua Jade Motor Co., Ltd. , http://www.china-steel-structure.com
Second, look at the land