What are the contraindications to the use of biopesticides?

1. In order to ensure the quality of the medicines, they should be purchased from regular manufacturers and sales points to prevent counterfeiting and shoddy, and pay attention to the production date and service life of the drugs and the reasonable storage and storage of the drugs to prevent them from expiring and invalidating.

2. Avoid using organisms at low temperaturesPesticidesThe active ingredient is protein crystals and full of living buds. Under low temperature conditions, the spores multiply slowly in the pest's body, and the protein crystals are not easy to function.

3. Avoid dry environmentThe spores in biological insecticides like a humid environment, so the higher the humidity in the field when used, the higher the efficacy, especially when spraying powdered biological agents, pesticides should pay more attention to the humidity in the field. Generally, the fungus powder is sprayed in the early morning and evening when there is dew, so that the fungus can better stick to the stems and leaves of crops, and promote the reproduction of spores and improve the efficacy. It is more effective to spray the spray in the foggy morning or to water the vegetables half an hour before spraying.

Fourth, avoid light The ultraviolet rays in the strong sunlight have a killing effect on the spores, and if the light is strong, the ultraviolet rays will kill them. According to the test, the spore mortality rate is about 50 after half an hour of direct sunlight; Direct exposure for 1 hour, the spore mortality rate reached 80. In addition, ultraviolet radiation can deform and degrade the cospore crystals.

Therefore, biopesticides should be sprayed on cloudy days or when low light enters the vegetable fields. It is generally applied before 10 a.m. or in the evening on a sunny day.

5. Avoid heavy rain and spray biopesticides soon after, in case of moderate to heavy rain, the bacterial liquid sprayed on the stems and leaves of crops will be washed away and the efficacy will be reduced. However, if it rains lightly after 5 hours of application, it will not only not reduce the control effect, but will have a synergistic effect, because it is conducive to the rapid reproduction of spores in and out of the pest.

Sixth, do not withagentWhen mixing and applying biological insecticides, do not mix with agents (such as carbendazim, methyl tobuzin, etc.), otherwise it is easy to lead to a serious reduction in the number of pesticides, thereby affecting the insecticidal effect. Therefore, even sprayers that have been sprayed with agents must be rinsed before they can be fitted with biopesticides.

It can't be a dry environment, as some biopesticides prefer humid environments. Do not keep the temperature too low, it will affect the speed at which the spores can multiply in the pest's body.

Do not use some inferior agents, do not use highly active agents at low temperatures, do not use them in a dry environment, do not use them in strong sunlight, and do not use them when it rains heavily.

When using pesticides, try not to use them in windy weather, and do not use them in rainy weather, try to choose to use pesticides when the sun is shining.

Biological pesticides have many advantages, for example, in terms of toxicity, the toxicity of biological pesticides is much lower than that of traditional pesticides, and the amount of pesticides remaining on crops is also lower than that of traditional pesticides, and biological pesticides have the ability to select, this selectivity makes biological pesticides only work on a specific organism, and have no effect on humans, birds, and other insects that are not harmful, which can be said to be very good, especially crops will not be resistant to this biological pesticides, It will not affect the yield of crops, which is very popular with farmers.

The precautions for the use of biopesticides are basically the following:

<> temperature, the main components of biological pesticides are some viruses, fungi, bacteria, pathogenic microorganisms and some active substances for viruses and other microorganisms, so the requirements for temperature are relatively high, generally between 25 degrees and 30 degrees, generally below this temperature, the prevention effect of biological pesticides on crops will be reduced by one to two times, higher than this temperature will also have an impact, but the impact is not large.

Humidity, generally the higher the humidity, the better the effect of biopesticides, so in the morning, on a cloudy day, or after rain.

Sunlight, to avoid the strong light of the sun, because the ultraviolet rays in the sunlight have a reducing and killing effect on the active ingredients in the biological pesticides, the light is to reduce the effect, the heavy is directly invalid, so we must avoid the strong light irradiation, so it is best to use biological pesticides at four or five o'clock in the afternoon.

When it rains, when spraying biopesticides on vegetation, it is generally sprayed on the surface of the vegetation of crops, and biopesticides will land on the surface of crops, and when harmful pests and diseases eat crops, they will enter the body of pests and diseases, and then kill the host of this harmful crop, but once it rains, the biopesticides will be washed to the ground and other positions, basically it will not play any role again, so it must be avoided washing.

It is necessary to pay attention to the use of pesticides, pay attention to the concentration of pesticides, need to use this pesticide at the right time, be sure to pay attention to the surrounding situation, need to pay attention to the weather, pay attention to moderation, and cannot use it in rainy days.

Avoid strong light irradiation, avoid applying pesticides in rainy days, avoid using inferior drugs, avoid using them at low temperatures, and avoid dry environments.

The contraindication is to protect your body, don't sprinkle too many pesticides, choose the right spraying method, spray pesticides on the basis of protecting crops, and spray pesticides correctly.

There are mainly the following types of biopesticides:

1. Pesticides made from pathogenic microorganisms: <>

Such as biological bacterial preparations: Bacillus thuringiensis. Preparations made from fungi:

Beauveria bassiana. Biological agents made from insect viruses such as: karyotype polyhedrovirus, granular virus, and plasma polyhedrovirus.

Nematode preparations, biological preparations made of microbial metabolites such as: avermectin, emamectin benzoate, liuyangmycin, etc.

Second, biological agents made from insect pheromones: <>

Such as insect ecdysone, insect information booby-trap agent insect sterilization agent, insect ecstasy agent. Insect inhibitors in the pyridoxanone, etc.

3. Biological agents produced by microbial parasitism, anti-jie resistance and cross-protection: <>

It is used more often, such as chunleimycin, streptomycin, etc.

Fourth, pesticides of plant origin: <>

Many plant-derived pesticides are common in the agricultural market, such as matrine, rotenone, azadirachtin, lilu, pyrethroid, citrin, plant essential oils, etc.

5. Mineral-derived pesticides: <>

Common and commonly used such as Bordeaux liquid, lime, stone sulfur mixture, sulfur powder, diesel emulsion, vegetable oil, etc.

Biopesticides are a development direction of agricultural materials in the future, and there is a lot of room for expansion, which is not only harmless to humans and animals, but also safe for the environment.

As for how to use, different products have different usage methods and requirements, please use according to the product requirements, according to the standard concentration.

How are biopesticides used? <>

Grasp the temperature of microorganismsThe activity of pesticides is directly related to temperature. The suitable temperature of the use environment should be higher than 15°C and lower than 30°C. Sprayed biopesticides are slow to multiply in pests below the right temperature, and they also struggle to work, resulting in poor product efficacy.

In general, microbial pesticides are 1 to 2 times more effective at 20 to 30 °C than at 10 to 15 °C.

Knowing humidityThe activity of microbial pesticides is closely related to humidity。The higher the humidity of the farmland environment, the more obvious the efficacy, especially the powdered microbial pesticides. It is best to use the drug in the morning and evening when the dew is not dry, so that the microorganisms can multiply quickly and have a better control effect.

Avoid the violent killing effect of ultraviolet rays on microbial pesticides。At 30 and 60 minutes of direct sunlight, microbial mortality can reach 50 and 80 percent. It's best to choose an app that is cloudy or at night.

Avoid rain after washing and sprayingIt is conducive to the reproduction of active tissues in microbial pesticides and does not affect the efficacy. However, heavy rains can wash away the liquid sprayed on the crops, affecting the effectiveness of the control. According to the local weather forecast, apply pesticides in time to avoid heavy rain and heavy rain to ensure the insecticidal effect.

In addition, virus-based microbial pesticides are highly specific and usually only work on one pest and have no effect on others. For example, the diamondback moth (Plutella xylostella) particle virus can only be used to control the diamondback moth (Plutella xylostella). Before use, the occurrence of pests in the field should be investigated, and the control period should be arranged according to the occurrence of pests, and used in time.

The precautions are that you must use the medicine safely, wear masks and gloves when using pesticides, and then avoid direct contact with the **, so as to avoid pesticides causing harm to the body.

It should be noted that the use of some pesticides with relatively high safety should also be paid attention to the proportion of pesticides.

When using, you must pay attention to the temperature, the humidity of the soil, the light time of ultraviolet rays, and the dose and appropriate amount to choose the appropriate concentration.

Nowadays, everyone's awareness of environmental protection and the concept of physical health are getting higher and higher, and a large number of people prefer "emerald green" food. Biopesticides have long been widely advertised and applied. So, what must be paid attention to when using biopesticides?

1. Check the weather and apply pesticides according to the ground.

The actual effect of the application of biopesticides is very harmful because of the natural environmental factors. Therefore, the specific application of biological pesticides must take a certain amount of time from spraying on green plants to insects feeding or touching the bacteria, and from pest ingestion to death, there must be a whole process, <>

It was susceptible to outside influences for a while. Among them, the elements of danger are temperature, ambient humidity, sunlight exposure, and solar winds. Therefore, in the process of applying pesticides, direct sunlight should be prevented, such as the application effect after 4 o'clock at noon, the wind has a very important effect on the drift and spread of granular biological pesticides, and the application of granules in the evening breeze has the actual effect.

Second, there is a difference in the application of pesticides in different regions.

The application of biopesticides varies from region to region. There are great differences in our regions, with the southern region being wet and cold and rainy, and the northern region and the central and western regions experiencing little drought and rainfall. Biopesticides can only be fully utilized if they take into account the criteria of their daily needs.

On the one hand, in arid climates, it is necessary to increase the water demand for pesticides, resulting in a high and low temperature natural environment, which is convenient for the survival and reproduction of microbial spores;

On the other hand, some special polymer materials and chemicals that improve the viscosity of aqueous solution can be added to traditional Chinese medicine preparations, such as potato starch in wooden stove sedan car, small animal bone glue, grass ash soil solution, etc., which can reduce the volatilization of the accumulation liquid sprayed by the medium, thereby preventing the generation of rapid drying, and then improving the actual effect of the use of biological pesticides.

3. Purposeful pesticide application.

Pests are the target of the efficacy of biopesticides, and the use of biopesticides is different for different types and characteristics of pests. Pests have several different stages of development in their lives, and each stage of development has different immunity to biological pesticides, so it is necessary to grasp the development stage where the pest is located.

Fourth, there is a clear rent, and there are optional mechanical equipment for pesticide application.

In the specific application of biological pesticides, most of the spraying system software is very inefficient, and it is generally applied to crops immediately from top to bottom, resulting in many chemical fertilizers gathering on the leaves on the crops, and other chemical fertilizers are damaged in the soil, especially when the fine particles are large, the damage is higher. At the same time, because of the high cost of biopesticide products, the technical performance of drug administration should be improved.

The application of excellent performance of spraying machinery and equipment is urgent, such as the use of mist spraying, and the fan gas nozzle supporting facilities of the hydraulic press nozzle to shoot small and uniform fine particles, so that the sprayer potential drifting matter and small liquid gushing to the estimated target leaf, thereby improving the control effect of biological pesticides, reducing product costs.

When using pesticides, be sure to wear protective gloves, wear protective clothing, do not expose your ** to the outside, when using pesticides, the stove lead must be chosen at about 10 o'clock in the morning or 5 o'clock in the afternoon after the reeds, do not touch your body with your hands, stay away from water sources when deploying pesticides, and be sure to pay attention to safety.

When using biopesticides, you need to pay attention to wearing masks and gloves to use, so as not to affect people.

1.It is necessary to pay attention to the use of biopesticides in the remaining paragraphs, 2Range, 3The amount used, 4The number of times used, reed lead 5If the pesticide varieties used are not properly controlled, it is likely to affect the final result.

First of all, when using it, we must consider the temperature, humidity, light and rain of the planting, and choose some pesticides with relatively high quality, and at the same time, the split pie can not be used with pesticides, and then we must do a good job of protecting the environment.

Biopesticides should be avoided from rain, and biopesticides should be protected from bright light, humidity and temperature.

Because the active ingredients of biopesticides are mainly composed of protein crystals and live spores, the temperature requirements are extremely high. Therefore, when using biological pesticides, ensure that the temperature is controlled at about 20, spray biopesticides once below the optimal temperature, the spores reproduce very slowly, and the protein crystals are difficult to play a role, so it is often difficult to achieve the best control effect. Tests have shown that under certain conditions of 20 30, the control effect of biopesticides is 10 15.

It is important to know the optimal temperature to ensure the spraying and biopesticide control effect.

Biopesticides are extremely sensitive to humidity requirements, and the higher the humidity of the farmland environment, the more obvious the efficacy, especially the powder biopesticides. Therefore, when spraying fungus powder, we must firmly grasp that when the dew is just dried in the morning and evening, when it is used for edible agricultural products such as vegetables, melons and fruits, it is necessary to ensure that the agent can be evenly sprayed on the stem, leaf surface and leaf back, so that the biological flora can multiply rapidly, immediately produce medicinal effect, and have a good control effect.

Because the ultraviolet rays in the sunlight have a lethal killing effect on biological bacteria, scientific experiments have proved that when the sun is directly exposed to 60 minutes and 120 minutes, the mortality rate of biological bacteria will reach 30% and 50%, in addition, ultraviolet radiation can also have a deformation and reducing effect on the companion cell crystal. Therefore, avoid strong sunlight exposure, enhance the vitality of biological bacteria, and give full play to the control role of biological bacteria.

Biopesticides are most afraid of heavy rain. Heavy rain washes away the bacterial liquid sprayed on vegetables, fruits, and other crops, affecting the lethality of bacteria. If there is light rain 5 to 8 hours after spraying, it is conducive to the rapid reproduction and decomposition of biological bacteria, accelerates the killing of harmful bacteria, and improves the control effect.

Therefore, it is necessary to make good use of its biological pesticides in time according to the local weather forecast, and it is strictly forbidden to use drugs during heavy rains to ensure its lethality.

Biopesticides refer to the use of living organisms or their metabolites, killing or inhibiting agricultural pests and preparations also have the effect of managing pests, but biopesticides are susceptible to external factors in the application process.