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, look at the sky
The use effect of biological pesticides is greatly affected by 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
The use of biological pesticides varies from region to region. 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 evaporation from the carrier sprayed out of the deposition solution, thus avoiding the rapid drying, thereby increasing the use of biological pesticides.
Third, see insects
Pests are the targets of biological pesticides. For different types and characteristics of pests, the use of biological pesticides is also different. The pests have several different stages of development in their lifetime. Different development stages have different resistance to bio-insecticides, so understanding the development stage of the pests is very necessary 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, look at machinery
In practical applications of biological pesticides, most of the spraying systems are very inefficient and are usually applied directly from top to bottom to the crops, resulting in a large number of pesticides that accumulate on the topmost leaves of the crops, and other pesticides are lost in the soil, especially When the droplets are 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.
Fifth, look at the dosage form
The control effect of biological 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, the powder can be dispersed in a large range by means of air buoyancy and wind force, thereby having greater contact with pests. For pests with a large amount of leaves, such as cabbage caterpillar, the method of spraying the wettable powder with water into a suspension can be used. Good, but the effect of dusting method 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.
Six, see the variety
In the practical use of biological pesticides, many people do not fully understand the nature of biological pesticides, and mistakenly believe that biological pesticides can kill all pests, and thus they purchase them indiscriminately. Actually, it is not so. Some effects increase production costs, increase the difficulty of prevention, and delay the period of 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 pest migration characteristics
In the practical use of biological pesticides, the use of biological pesticides in combination with high-efficiency, low-toxicity, low-residue chemical pesticides should also be adopted according to the characteristics of pest migration, because the addition of low-dose chemical pesticides to biological pesticides can reduce pest resistance. Forces create conditions for the intrusion 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.
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