What kind of weather is the most suitable for spraying during the growing season of crops?

<> When injecting crop pests with insecticides for prophylaxis and **, it is necessary to pay attention to meteorological conditions to achieve good results and should pay attention to the following relationship:

First, pay attention to the relationship between spray and rain. In general, when the dew is not dry in the morning, a powder insecticide should be sprayed so that the powder can adhere to the stem of the crop, and water-soluble pesticides should be sprayed, which should be applied after a sunny day, so that the insecticide is not diluted with the dew and reduces its efficacy. In addition, it is not recommended to run it when it rains, regardless of polishing or spraying.

Otherwise, the pesticide will not be able to produce the effects of rainwater. In particular, powders and wettable powders are refreshed most clearly.

Spraying pesticides should be aware of meteorological conditions.

Second, pay attention to the relationship between spray and temperature. Under normal conditions, the higher the temperature, the faster the chemical evaporation, the higher the permeation, and therefore the higher the efficacy. At this point, the spray should be appropriately reduced by the amount or concentration of the drug; At air temperature, when the temperature is low, it should be sprayed.

Appropriately increase the drug and increase the concentration to improve the efficacy. However, the temperature is too high and it is not appropriate to spray it, because in the high temperature of the sun, it is usually caused by crops, the drug is also volatile, and sometimes it can also be poisoned. High temperatures increase the decomposition of pesticides and the volatilization of drugs, so high temperatures should not fight medicine, because crops are strong in inflammation, metabolism is strong, the blades are open, and drugs can easily get into criminals.

Spraying pesticides should be aware of meteorological conditions.

<>Third, pay attention to the relationship between spray and wind direction. Wind has a significant impact on spraying pesticides. When there is wind, the operator should be backwards or leeward.

Otherwise, it is difficult to ensure that the drug is sprayed exactly as needed. When the wind blows, the wind tends to make the sprayed powder or fog droplets flutter and does not attach evenly to the surface of the crop, and will also be prone to poisoning on the applicator.

Spraying pesticides should be aware of meteorological conditions.

Fourth, the application time. In terms of hot days, it is necessary to avoid periods of high temperatures, and for crops within 10-13 o'clock, when the dew is not dry, the temperature is relatively low, and the defects have not yet appeared. At this point, the spray is not good.

Avoid using well water, as it contains calcium, magnesium, and other minerals and is easily responsive**.

Spraying pesticides should be aware of meteorological conditions.

In short, spraying pesticides must determine the appropriate device method according to meteorological conditions and the different properties of various pesticides.

It should be the most suitable on a cloudy day. Because the sun temperature is not high, then you will not increase the fertilizer with pesticides.

I think it is most suitable to use sunny and windless weather, so that the spray of pesticides can accurately fall on the roots and leaves, and will not be blown away by the wind.

It is best to apply the medicine in cloudy weather without wind, because the temperature is low on cloudy days, and the medicine is not easy to evaporate, and if there is windy weather, the medicine will be blown away by the wind.

Biopesticides need to find good weather to apply, why is that? Spraying biological pesticides has to take into account the element of temperature, and biological pesticides are very standard for temperature, and when they must be sprayed, the suitable temperature is above 20 degrees. If it is less than this temperature, it is difficult to show the effect of the drug, and at the same time, it will not be able to achieve the prevention effect.

Many manufacturing experiments have confirmed that under conditions of 20-30, the efficacy of biopesticides will be 1-2 times higher.

Humidity hazards, spray should be sprayed at the time of day. Biopesticides are actually very sensitive to humidity, and in conditions with high humidity, the efficacy will be better, especially in powdered biopesticides. Therefore, when spraying germ granules, it is necessary to choose the time when the dew drops have not dried sooner or later.

The application of biopesticides under strong light cannot start the efficacy, and the other lines contained in the obvious sunlight have destructive effect on the spores of biopesticides. If the sun shines for more than 30 minutes, the relevant ingredients in the biopesticide will be lethal, so it is necessary to prevent strong cracking sunlight.

Always pay attention to the weather forecast and prevent spraying before a rainstorm. The spores in the biological pesticides can not resist the washing of the rainstorm, and the sprayed bacterial solution will be washed away, and the actual effect of insecticide will be reduced, and the high efficacy will be submitted in case of encounter. Therefore, it is necessary to pay attention to the hazards of temperature at all times, so that the effect of the biological pesticides you spray can be fully utilized.

The advantage of using biological pesticides is that it can eliminate a variety of pests and diseases; Second, it can produce and manufacture pollution-free environmental protection products; Third, it can reduce environmental pollution to the natural environment and ensure the safety of people and animals; Fourth, it can maintain its nemesis; Fifth, pests and diseases are not easy to form drug resistance.

The appropriate application of biological pesticides should be based on the meteorological forecast of the local flight control unit, and the biological pesticides should be applied a few days in advance; It is necessary to strictly use the drug according to the dosage of application, and the concentration value cannot be arbitrarily increased or decreased; In order to better improve the control effect and safety factor, it can be mixed with some microtoxic fertilizers, but high-efficiency BT is strictly forbidden to be mixed with pesticides, fungicides and acid-alkaline mixtures, and cannot be applied in mulberry gardens; Do not expose the drug to the sun or regain moisture; It is necessary to choose the medicine at noon on a sunny day, or the medicine on a rainy day, and spray it again once when it rains after the medicine.

Mechanism of action of biological pesticides: There is a gradual whole process of biological pesticides for the poisoning of pests and diseases. If the high-efficiency BT is fully exerted, it must take 1 to 3 days to numb the nervous system of the pest first, and then destroy its internal organs and cause its death. For example, when a virus infects a poisonous pest, it is the nucleotides of the virions that enter the body of the invading insect and absorb the nutrients of the insect, resulting in the disintegration of tissue cells and death, which must take 3 to 5 days.

Although the visualization effect of biopesticides is slower than that of biopesticides, the damage of pests and diseases to plants has been suppressed after spraying. Therefore, it is important to apply this fertilizer effectively according to its characteristics.

That's all for my detailed introduction, I hope it will be helpful to you after reading it.

Because this is what helps its efficacy. When spraying biological pesticides, it is necessary to control them above 20 degrees Celsius, and heavy rain will wash away the sprayed biological pesticides, so that the spores lose their lethality and so on.

This can play a better role, can solve many problems, and avoid the effect of reducing due to weather and affecting the use effect.

The toxic effects of pesticides on pests and bacteria are often related to the weather conditions at the time of use. Generally speaking, under the conditions of strong wind, heavy rain, high temperature and humidity, the use of pesticides will reduce the efficacy, shorten the residual period, and sometimes even cause drug damage.

High temperature is easy to promote the decomposition of pesticides and the volatilization of active ingredients, when the weather is hot, the chemical activity of pesticides becomes stronger, and the toxicity of pesticides becomes greater correspondingly. Crops thrive in hot weather, and the pores on the leaves are large and open. When the drug is sprayed, it can easily invade the object, causing the drug to be damaged.

Therefore, in hot and hot weather conditions, try not to use medication, especially around noon.

The effect of high humidity on pesticides is mainly to accelerate the chemical decomposition of some pesticides, making them ineffective or causing drug damage. If the surface of the leaf is humid, it is easy to adhere to the powdery pesticide, resulting in uneven application of pesticides and drug damage. At the same time, the dew on the leaves will also dilute the drug and reduce its effectiveness.

Therefore, Bordeaux liquid, sodium fluorosilicate and other agents that are greatly affected by humidity should not be used after fog, dew or rain. If necessary, measures should be taken, such as reducing the amount of copper sulphate or increasing the amount of lime when spraying Bordeaux liquid. Generally, it should be used in sunny, windless or windy, dew-free weather.

In case of rain, try not to use medication. On the one hand, rainwater flushing reduces efficiency and waste. On the other hand, it can also lead to field contamination.

Generally, after spraying pesticides, rainfall occurs within a few hours, and depending on the size and duration of the rainfall, the rainfall will cause varying degrees of impact. Therefore, when taking medication, pay attention to check the weather forecast in advance and avoid rainy days. In addition, early morning dew can also reduce the effectiveness of most pesticides.

However, in the case of powders and wettable powders, dew can promote the adhesion of the agent to the leaves, which is beneficial to the exertion of efficacy.

The effects of windy weather are noticeable. First of all, strong winds will disperse the liquid medicine and make it volatile easily. Secondly, if strong winds blow the chemical solution to other crops with low resistance, it is prone to symptoms of pesticide damage. Therefore, it is advisable to spray pesticides in the absence of wind or breezes.

Under the hot weather conditions, try not to use the drug, especially at noon, it is not suitable to apply the drug, such as the application, the dosage should be smaller, in order to prevent the poisoning accident of the pesticide and the applicator. The application time should be carried out from 8 to 10 a.m. and after 4 p.m. Due to the low temperature and low wind during this time, the air above the plants has an inversion layer, which can prevent the insecticides from flying indiscriminately and can gather evenly on the plants.

This can improve the efficacy of the drug and reduce the damage of the drug. However, the vitality of crops is vigorous in hot weather, and the stomata on the leaves are opened many and large, and pesticides can easily invade the crop after spraying, resulting in pesticide damage. High temperature is easy to promote the decomposition of pesticides and the volatilization of active ingredients, the hotter the weather, the stronger the chemical activity of pesticides, the greater the toxicity.

The above phenomenon occurs under high temperature conditions, such as stone sulfur mixture, emulsifiable concentrate and a variety of herbicides. <>

At the same time, during the high temperature season, the rate of pest reproduction and spread accelerates, and the resistance to pests increases. For example, many pests have the habit of avoiding the sun, and tend to concentrate on the lower end of the plant between the clusters or the back of the leaves, and the disease is mainly invaded by the stomata on the back of the leaves and the lower leaves. According to the nature and characteristics of the disease, reasonably determine the spraying site, grasp the timing of spraying, pay attention to check the efficacy, appropriately replace the insecticide, reduce the pest resistance, and improve the control effect.

What are the effects of weather factors on the use of pesticides, in addition, in the high temperature season, the law of pest activity also has its characteristics. <>

For example, the high humidity of the foliar surface is easy to adhere to the powder pesticide, and the pesticide application is uneven, resulting in pesticide damage, and the dew on the foliar surface can also be used as a pesticide to reduce the efficacy. If it must be used, measures should be taken, for example, when spraying Bordeaux liquid, reducing the amount of copper sulphate or increasing the amount of lime. When applying pesticides, it is generally necessary to choose sunny weather without wind or dew.

The effect of high humidity on pesticides is mainly to accelerate the chemical decomposition of some pesticides, so that pesticides become ineffective or cause pesticide damage. Therefore, in foggy days, dew or just rain, it is not advisable to use pesticides that are greatly affected by humidity.

Wind will blow away pesticides, especially powders, and at the same time, it will also accelerate the volatilization of pesticides; Secondly, due to the influence of wind, the branches and leaves of crop plants will vibrate and rub against each other, which will lead to the mechanical loss of pesticides. Thirdly, the spray of wine spray or powder is easy to flutter with the wind, and cannot evenly land and adhere to the surface of the crops to be controlled; Pesticides can easily fall onto the applicator, increasing the chance of poisoning. When spraying pesticides, powders and tobacco agents are greatly affected by wind and wind.

Try to use it on a sunny day or after rain, as this is the only way to keep the pesticide longer and avoid being washed away by the rain.

When using pesticides, you should choose to use them on sunny days, and avoid using pesticides in rainy or windy weather, because this is likely to affect the effect of pesticides.

Pesticides must be sprayed at mild temperatures, too high temperatures may affect crops, pay attention to the humidity situation, and master the skills, but also understand the hazards, and pay attention to the dosage when using pesticides.

You should choose a sunny day, a windless day, a cloudy day, or a cloudy day. My understanding is that when using pesticides, you must not choose rainy or snowy days, because such weather will affect the use of pesticides, and will also cause the volatilization of pesticides, and will also lead to the loss of pesticides.

Take cucumbers in greenhouses as an example:

1. In the high temperature season of summer and autumn, the best time to apply pesticides should be selected around 9 a.m. and after 4 p.m. on sunny days.

2. In the low temperature season of winter and spring, the best time to apply pesticides is from 2:30 to 3:30 in the afternoon.

The best time of day to apply pesticides is between 8 and 10 a.m. and after 5 p.m.

The best spraying time of the day in the summer and spring source season and the high temperature season is after the dew dries in the morning to before 10 o'clock and after 4 o'clock in the afternoon. Because the transpiration of the leaves of the crop is weakened at this time, the respiratory stomata of the leaves are stretched and opened, which is conducive to the absorption of the liquid medicine and the improvement of the use effect of the agent. The cool season of spring and autumn should be sprayed after 9 a.m. and before 2 p.m.

At this time, spraying is conducive to the exertion and penetration of the efficacy of the senfeng, and improves the penetration effect of the agent. At this time, the outdoor temperature is kept at about 15 degrees, which is conducive to the absorption of the liquid. In the cold season of winter and spring, we must choose to spray when the temperature rises and the climate is warm.

At this time, the timing of spraying is not too much, mainly in the spring of the fruit tree garden, the choice of pesticides is mainly some agents with good systemic properties.

Common application methods of pesticides

Spray method, pesticide preparations that can be used in liquid form (except for ultra-low volume sprays) such as emulsifiable concentrate, wettable powder, soluble powder need to be added to water to make emulsion, solution, suspension before it can be used for spraying, this application method is called spray method. The selection of the sprayer should have good performance and ensure the quality of the spray. There is a thick waxy layer on the surface of the plant, which is not conducive to liquid application, and additives such as penetrants can be added.

Pay attention to the quality of the water used, and choose clean water. Be careful to avoid environmental pollution.

Scattering method, throwing or sprinkling granular pesticide application method. It is mainly used for soil treatment, paddy field pesticide application or crop heart leaf pesticide application. In addition to granules, other pesticides need to be formulated into toxic soil or toxic fertilizer dust.

Attention should be paid to the quality of the mixture, and the mixture of pesticides and fertilizers should not be stacked for too long. The time of sprinkling should be mastered, and the pesticide application in paddy fields requires the dew of the paddy field to be dispersed, so as not to cause pesticide damage caused by the poisonous soil sticking to the rice leaves. Sprinkle pesticides with dew is required.