When is the best time to apply pesticides?

In the process of crop planting, if pests and diseases occur, pesticides should be applied in time. When is it most effective to administer?

The optimal time to spray different crops varies slightly depending on the season. For example, in the greenhouse cucumber, generally speaking, in the summer and autumn high temperature season, the best time to apply the pesticide should be around 9 am and after 4 pm. On a sunny day.

Around 9 a.m., the dew had dried and the temperature was not too high. At the same time, it is also the period when pest and disease activity is at its most vigorous. At this time, the drug is effective; After 4 p.m., the light becomes weaker, the temperature becomes lower, and nocturnal pests (whiteflies and thrips.

Become active. At this time, spraying also has a high bactericidal and insecticidal effect.

Practice has proven that the best time to spray pesticides in the summer, whether it is food crops.

Vegetable crops, cash crops.

or fruit trees, they should be around 8:00 a.m. to 10:00 p.m. What is the reason for 5:00 p.m.?

This is because: around 9 a.m., the dew is generally dry and the temperature is not too high. It is the time when sunrise pests are most vigorous in feeding, moving, and mating.

Therefore, when using the drug, its efficacy will not be reduced by dew washing or dilution, nor will its efficacy be affected by the pyrolysis of the drug. On the contrary, the use of drugs at this time will increase the chance of pests feeding and contact, and effectively improve the lethality of pesticides. Approximately 5 p.m

00, the sun is in the west, it is "the evening of the sunset in the western mountains". At this time, the light becomes weaker and nocturnal pests become active (feeding, mating, etc.). Therefore, at this time, the spray also has a high killing effect.

In addition, pesticides should not be sprayed at noon. Due to the high temperature and strong sunlight at this time, some pests hide in the backlight or even stop their activities for fear of bright light. In addition, the drug decomposes quickly at high temperatures, which reduces the efficacy of the drug.

At the same time, when the medicine is used at noon, the liquid volatilizes quickly, which can easily lead to human and animal poisoning. In the low temperature season of winter and spring, the suitable time for pesticide application is from 2:30 p.m. to 3:30 p.m. Due to the low temperature in the shed in winter and spring, photosynthesis occurs in the morning after the dew of the leaves recedes.

Gradually entering the peak. If spraying in the morning will inevitably affect the temperature rise and reduce the photosynthetic efficiency, it is not advisable to use the drug in the morning.

Do not spray at noon on a sunny day. Due to the high temperature in the shed when spraying at noon, the high temperature is easy to promote the decomposition of the drug and the volatilization of the active ingredients of the drug. In addition, in hot weather, the vitality of the crops will become vigorous, and the pores on the leaves will open wider.

If the drug is sprayed at this time, the drug can easily invade the working object, which greatly increases the chance of drug damage. In addition, when the pesticide is applied at noon, the chemical activity of the pesticide will become stronger, and the toxicity of the pesticide will also become greater, which can easily cause poisoning accidents for the applicator.

Mainly according to the specific situation, under normal circumstances, it is necessary to spray pesticides in May and June, when pesticides can avoid many pests.

The best time is around 9 a.m. or after 4 p.m. during the summer high temperature season, or around 3:30 p.m. during the winter and spring low temperature season.

From 9 a.m. to 4 p.m. every day, spraying pesticides at this time is the best, so that pesticides can fully exert their effects.

I think the best time is in the summer because it helps the crops grow.

When it comes to pesticides, I think everyone is no stranger, with the progress of science and technology, it has also brought breakthroughs to the agricultural field, and pesticides are playing an indispensable role in agricultural production activities. Pesticides refer to chemical agents used in agricultural activities to control pests and diseases and regulate plant growth. Of course, for pesticides, there are also specific instructions, that must be used in strict accordance with the rules of use, today we will focus on talking, when is the best time to use pesticides?

For different plants, its best spraying time in different seasons is also very different, let's talk about cucumbers in the greenhouse, for it, it is generally in the summer high temperature season, around 9 am and after 4 pm is the best time, pesticides must be selected, sprayed on sunny days. There is a basis for why these two times were chosen.

Because at about 9 o'clock in the morning, the dew is generally dry, the temperature is not very high, and at the same time, it is the most vigorous time for pests and diseases, so the use of pesticides at this time will have a better effect. If you spray too early, the leaves of the crops will get dew, and in this case, the pesticides will be diluted, so we have to choose after the sun comes out, which is what I just said, around 9 am to 10 am.

For the second time period, that is, after 4 p.m., this time is chosen because at this time, the light gradually weakens, the temperature begins to decrease, and the pests that come out at night begin to become active, so the sterilization and insecticide effect will be better at this time. However, spraying pesticides in the afternoon should pay attention to the time can not be too late, must be in the evening before the dew appears, so that the pesticide can better exert its medicinal properties, and when the dew comes down, it will affect the medicinal properties of pesticides.

If it is the low temperature season in winter and spring, then the application time of pesticides is 2:30 p.m. and 3:30 p.m. Because at this time, the temperature in the greenhouse is low, just to fade the leaf dew in the morning, photosynthesis.

It is also at this time that it enters the peak period.

There is one last point to note, that is, it is not possible to spray at noon on a sunny day, the temperature in the shed is high at noon, which is easy to make the decomposition of the agent volatilize some components of the drug, affect the efficacy of the drug, and the poisoning accident of the pesticide applicator.

There are skills in the use of pesticides, and they are applied strictly according to the instructions for use, and at the same time, it is also necessary to pay attention to the spraying time of pesticides, so as to better exert their efficacy.

The best time to apply pesticides should be around 9 a.m. and after 4 p.m. on a sunny day. At about 9 o'clock in the morning, the general dew has dried, the temperature is not too high, and at the same time, it is the most vigorous time for pests and diseases, and the effect of medicine is good at this time; After 4 p.m., the light gradually weakens, the temperature gradually decreases, and nocturnal pests (whiteflies, thrips) begin to be active. Practice has proved that spraying pesticides in summer, whether it is for food crops, vegetable crops, cash crops, or fruit trees, etc., should be around 8 to 10 a.m. and 5 p.m. as the best time.

The best time is at 10 o'clock in the morning, when using pesticides, you should also pay attention to the composition of crops, you should also pay attention to the content of crops, and at the same time, you should pay attention to the time of use, and pay attention to personal protection.

At two or three o'clock in the afternoon, the photosynthesis at this time is very strong, and the effect of using pesticides is a little better.

1.In the summer high temperature season, the spraying time should be before 10 a.m. and after 4 p.m. In the cool spring and autumn season, it should be after 10 a.m. and before 2 p.m. For greenhouses in winter and spring, choose to spray in the morning in sunny and warm weather.

2.Different crops have different pesticide application times in different seasons.

Under normal circumstances, the application time in the vegetable greenhouse in the summer and autumn high temperature season is about 9 o'clock in the morning and about 4 o'clock in the afternoon. The dew is dry at nine o'clock, and it is also the time when pests are active, so it is good to spray at this time.

After four o'clock in the afternoon, the light begins to weaken, the temperature drops significantly, and some pests that appear at night begin to be active.

The temperature is low in winter and spring, and the temperature in the greenhouse is low in the morning, so it is necessary to raise the temperature to increase the photosynthesis of vegetables.

Therefore, the spraying time is between 2:30 and 3:30 in the afternoon.

Note: Determine the spraying time according to the temperature and its change trend!

Generally speaking, vegetable farmers do not spray at noon on sunny days in summer and autumn, because the temperature is high during this period, and pesticide damage is easy to occur. But in the cold winter and spring, many vegetable farmers will choose to spray at noon. Their idea is that the temperature and humidity in the winter and spring shed are low, and the effect of the medicine cannot be played quickly and better after spraying.

If the medicine is sprayed at noon, under the irradiation of the sun, the liquid medicine dries faster, which can better penetrate into the leaves and improve the effect of the drug.

This idea is wrong, whether it is winter and spring stubble or summer and autumn stubble, you should avoid taking medicine at noon on a sunny day. Because the high temperature at noon on a sunny day is easy to promote the decomposition of the agent and the volatilization of water in the solution, when the weather is hot, the chemical activity of the agent becomes stronger, and the toxicity of the pesticide becomes greater. Especially at high temperatures, emulsifiable concentrate and a variety of herbicides are sprayed.

, it is easy to cause pesticide damage and poisoning accidents of pesticide applicators.

First of all, pesticides can not be used in the morning and evening, there is dew on the crops in the morning and evening, which is not conducive to the pesticide attachment to the crops. It is best to spray pesticides around 9 a.m. and after 4 p.m. on sunny days. Because around 9 o'clock in the morning, the leaves of fruit trees and crops are generally dew and dry, and the temperature is not too high, and at the same time, it is the most vigorous time for pest and disease activities, so the spraying effect is better at this time; After 4 p.m., the light gradually decreases and the temperature gradually decreases, and nocturnal pests (whiteflies, thrips.

Start the activity and spray at this time, which also has a higher bactericidal and insecticidal effect.

So it's also the time when pesticide feeding is rampant at sunrise. Therefore, whether in cereals, vegetables and fruits, the best time for crop spraying or crop spraying is 8. By 10 o'clock.

At this time, since the dew is gifted and the temperature is not very high, it is the time when the sun pests feed and live vigorously. At this time, the drug is not diluted by dew.

Therefore, when spraying pesticides in summer, whether it is cereals or vegetables and fruits, the best time should be around 9 to 10 meters. At this time, the dew gradually dries and the temperature is not very high. At the same time, it also reduces the effectiveness of several pests.

Practice has proven that the best time to spray pesticides in the summer, whether it is food crops.

Vegetables, cash crops.

Or fruit trees, it must be around 10:00 and 5:00 p.m. and around 6:00 p.m. What is the reason? This is because pesticides are sprayed around 9:00 in the summer.

Eight to ten a.m. is the best time to plant food crops, cash crops, and fruit trees. About 5 p.m., about 9 a.m., the dew was dry and the temperature was not very high. This is the sunrise plague.

The best time should be eight in the morning. Around 5 p.m., because the dew is dry and the temperature around 9 to 9 is not too high, it's time for the sunrise pests to feed, move, and mate energetically. Therefore, there is no need to use drugs at this time.

Choose 5 p.m. or choose to avoid some sunny times to get a very good pesticide spray.

It is better after 5 p.m., when the temperature is not very high, so that the drug can exert its maximum effect.

Generally speaking, in the summer and autumn high temperature season, the best time to apply pesticides should be around 9 a.m. and after 4 p.m. on a sunny day. At about 9 o'clock in the morning, the general dew has dried, the temperature is not too high, and at the same time, it is the most vigorous time for pests and diseases, and the effect of medicine is good at this time;

It is best to choose the time to spray pesticides in summer and autumn at night, because the temperature at night is not particularly high, and the humidity is relatively good.

The time of pesticide application is different in each season.

In the summer high temperature season, the spraying time should be before 10 a.m. and after 4 p.m. In the cool spring and autumn season, you should choose after 10 a.m. and before 2 p.m. In winter and spring, it is best to choose the morning spray in sunny and warm weather.

Most people are accustomed to calculating how much medicine is mixed in each bucket of water according to the dilution factor, but this is not scientific. Be sure to add how much agent to each bucket of water according to the dilution factor, and calculate the details such as how many buckets of water will be sprayed down in the entire orchard, spraying speed, etc.

You can't increase the amount of medicine at will, spray quickly, be sure to mix the medicine according to the instructions, and spray carefully. After the liquid is sprayed, within a certain distance, the farther away from the nozzle, the smaller the droplets, and the smaller the droplets are easier to deposit and spread on the leaves. Therefore, it is wrong to say that the nozzle is more effective against the blade.

Generally speaking, the nozzle of the knapsack electric sprayer is 30-50 cm away from the blade, and the motorized sprayer should be kept 1 meter away.

Precautions for the use of pesticides

Choose a spray head with smaller droplets. Choose a spray head with slightly larger droplets for spraying insecticides, and a fan-shaped spray head for spraying herbicides. Choose a sunny day without wind before and after sunset to spray, and do not spray in rainy and windy weather, high temperature and strong light.

According to different control objects, the corresponding pesticide application technology is adopted.

The liquid medicine should be sprayed evenly and in place, and the inner chamber of the plant and the front and back of the leaves should be sprayed in place. Different pesticides have different safety intervals, and they should be used in accordance with the provisions of the pesticide label. Before the operation, wear the necessary protective clothing, masks and other protective equipment, during the application period is forbidden to smoke, eat and drink, when applying pesticides, to stand in the upwind direction, the implementation of crop interlacing pesticide application, after the application of timely change of clothing, wash the body.

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 mixed with 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 the paddy field 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.