When is the best time to use pesticides?

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.

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.

There is no unified standard for this, we use different pesticides, so its safety interval is not the same. Let's say if we're using dichlorvos.

Or rather, trichlorfon.

Then its safety interval cycle is generally 7 days, only more than 7 days after can be picked, if not more than 7 days, then there will be this pesticide residue, will affect health, and does not meet food safety standards.

This is important to note. <>

Of course, if you use thisCarbendazimTo spray some crops for bacterial diseases, then its interval is about 20 days. For example, once a bacterial disease occurs like this eggplant, like this wheat, or like this fruit tree, we have to spray some carbendazim to sterilize, then its interval cycle should be 20 days, if it does not reach 20 days, do not pick or collect, because there will be pesticide residues, so this must be paid attention to, so as not to cause harm to the body. <>

In life, we also need to see how much the concentration of pesticides we use, taking this trichlorfon as an example, if the concentration used is, then its safety cycle is about three days. If you don't understand, you can also ask the boss who sells pesticides, ask him how much concentration he should use, how many days to interval, for example, to plant cabbage as an example, use this polyester emulsifiable pesticide, the concentration is about 10%, generally speaking, 5 days is a safe cycle. <>

If the pesticides used are:ChlorothalonilIf the concentration of this powder reaches 75% or more, then the interval period is about one week. In fact, the pesticides we use must be clearly understood, this manual has a clear record of this safety interval, if you don't understand, you can call the manufacturer, or pay tribute to the sales staff to inquire, so as to be able to do the bottom of the mind, so as not to cause unnecessary trouble.

The safety interval refers to the period from the last application to the harvest and consumption of the crop, that is, the time required from the spraying to the maximum allowable residue. The general safety interval is 7 days.

The safety interval is generally about three months to four months, and pesticides should not be used during this period, otherwise it will cause pesticide damage to crops.

The safety interval of commonly used pesticides for crops is generally about three days, and the application of pesticides should not be too frequent, otherwise the effect will be conflicting.

The pesticide safety isolation period is about half a month, because the effect of pesticides is very strong, and if the time is particularly short, it may be poisoned.

The timing of this is not uniform, because in general, it must be after 7 days, otherwise it will have a certain impact on the crops.

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.

Summary. Contact killers such as pyrethroids can kill more than 90 in half a day (4-6 hours), and the effect can be seen after two days for general fungicides and insecticidal dimethoate after three days (72 hours).

Contact killers such as pyrethroid strip dismantling, half a day of walking ants (4-6 hours) time can be lethal more than 90 general fungicides play a role two days later, insecticidal Letou with jujube fruit, etc. three days (72 hours) can see the effect.

4 hours plus silicone to get a quick effect.

It is reported that the efficacy time of different pesticides is different, such as fungicides: 75% chlorothalonil wettable powder is 7 days, 77% killable wettable powder is 3 5 days, and 50% promethine wettable powder is 4 7 days; Insecticides: 10% cypermethrin EC for 2 5 days, bromopermethrin for 2 days; Acaricides:

50% bromodifen emulsifiable concentrate for 14 days, and 50% tolcoxonly wet powder liquid per mu before burial for 7 days. Finger clearing.

It is reported that the efficacy time of different pesticides is different, such as fungicides: 75% chlorothalonil wettable powder is 7 days, 77% killable wettable powder is 3 5 days, and 50% promethine wettable powder is 4 7 days; Insecticides: 10% cypermethrin EC for 2 5 days, bromopermethrin for 2 days; Acaricides:

50% bromodifen emulsifiable concentrate for 14 days, and 50% tolcoxonly wet powder liquid per mu before burial for 7 days. Finger clearing.

The best time to spray fungicides should be decided according to the season, Xia Xuncha autumn is generally more suitable for spraying after 10 am and 4 pm, and it is more appropriate to spray in the winter and spring preparation season at 2-4 pm. In addition to the appropriate time, attention should also be paid to the concentration of the spray, the safety period of the fungicide and the standard of mixed use. The fungicide is generally sprayed for 4-5 hours after the rain has no effect, but the mu Yu eggplant should also be based on the actual situation.

The best time to play fungicide 1, the spraying time of the slip base in different seasons is not the same, in the summer and autumn high temperature season, the spraying should be selected in the sunny day around 10 o'clock in the morning and after 4 o'clock in the afternoon, because around 10 o'clock in the morning, the leaves of fruit trees and crops are generally dewy and dry, the temperature is not too high, and at the same time it is the most vigorous time for pest and disease activities, and the spraying effect is better at this time; After 4 o'clock in the afternoon, the light gradually weakens, the temperature gradually decreases, and the nocturnal pests whiteflies and thrips begin to move. 2. In the season of low temperature in winter and spring, the spraying time is appropriate at 2-4 o'clock in the afternoon, because the temperature is low in winter and spring, after the leaf dew recedes in the morning, photosynthesis allows the digging to gradually enter the peak period, if spraying in the morning will inevitably affect the increase in temperature and reduce the photosynthetic efficiency, so it is not suitable to use medicine in the morning. When spraying, in addition to choosing the right time, we should also pay attention to the concentration of spraying, the safety period of the fungicide, the standard of mixing and the size of the droplets.

I wish you a happy life and a happy day.

Is it okay to mix fungicides with pesticides?

It's better not to be dear.

Use separately.