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.
Look at the sky
The use effect of biological pesticides is greatly affected by environmental factors. Therefore, in practical applications, 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 to feed from pests to death. During this period, it was vulnerable to external influences. 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.
Look at the ground
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 for the survival and reproduction of 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 the evaporation of the deposition liquid sprayed by the carrier, thereby avoiding the occurrence of rapid drying, thereby improving the use effect of the biological pesticide.
Watching insects
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.
See the dosage form
The control effect of biological pesticides is often closely related to the dosage form and use technology. Therefore, when using bio-pesticide, 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, 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 large amount of edible leaves, such as cabbage caterpillar, it can be sprayed with a wettable powder and water to form a suspension. 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.
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.
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