I am spraying fruit trees, can I do it again when it rains?

For the subject's question, is the fruit tree being sprayed, can it be played again if it rains? This problem may have been encountered by many fruit farmers, that is, it rained not long after the medicine, and it was very nerve-wracking to encounter this situation, should it be played again or not? Wei Nong thought that this problem should be dealt with according to the specific situation at that time.

We know that although the mode of action of pesticides on crops is different, and the difference is relatively large. However, whether it is an insecticide or a fungicide pesticide, it takes a certain amount of time to take effect after spraying the fruit tree. As long as you have this necessary time, you can play your due role.

At this time, if it rains, it should not have a big effect on the efficacy of the medicine. However, if the rainfall is relatively heavy after spraying, or if it encounters rainy weather, then the effect of the medicine will definitely be reduced, and the medicine must be re-injected after the weather is fine.

So, how to deal with rain when spraying?

In summer, the climate is changeable, and there are many thunderstorms, so it is easy to rain unexpectedly when you spray fruit trees at this time. But as long as it rains after 3 or 4 hours after the injection, there should be no major problem. With this 3 to 4 hours of time, the pesticide has basically played its role, or most of the effect has been absorbed by the leaves of the fruit tree, and there is no need to re-inject the pesticide.

If it starts to rain when the pesticide is being applied, and the rain is still relatively heavy, then the pesticide that has been sprayed in front of it basically has no effect, and the pesticide should be sprayed again after the weather is clear. If it's a light rain, just a few drops of rain, or a little drizzle, it doesn't make much of a difference.

The drizzle is wet, and I believe that the growers will judge the amount of rainfall. That is, although it is raining lightly, if the leaves have been wet by the rain, or even if the leaves can be slipped by rain, the rain at this time can dilute or dilute the effect of the medicine, so it is better to stop not continuing to spray, and wait until the weather is sunny after the rain to apply the medicine again.

Spraying fruit trees is a chore, and now pesticides are more expensive, when it rains, not only do you have to suffer, but also do not work, waste money in vain, it is indeed a thing that outweighs the loss. Therefore, every time before spraying, you must pay attention to weather changes, pay attention to listen to the weather forecast, and try to avoid spraying or rain for a short time.

In short, for the problem of rain when spraying fruit trees, as a fruit farmer, you should try to avoid it as much as possible, I believe that as long as you pay attention to the weather forecast, generally speaking, this situation may rarely occur. In case such a problem unfortunately occurs, it is necessary to take a more appropriate way to deal with it according to the actual situation encountered, and strive to achieve the purpose of not affecting the efficacy of the drug and not wasting pesticides.

Normally, there is no need to replenish the pesticide immediately, because there are still water droplets on the leaves at this time, and the pesticide concentration will be diluted again. In addition, excessive humidity will increase the conditions for the spread of diseases. It is necessary to wait until the rain has passed and the weather is clear and the leaves and ground are relatively dry before tonicing.

After all, even if there are still pesticide residues on the leaves after rain, there may be pesticide damage caused by high concentrations when supplementing again. The agents that need to be paid attention to are: benzoxystrobin, propiconazole, hexaconazole, thiazuron, chlorfenapyr, etc.

Recently, it has rained heavily, and there is precipitation in most parts of the country, many farmer friends asked. It was raining when I finished taking my medicine. Do you want to fight again?

What should you do if you are afraid that you will not be able to spray anymore, disease, insect pests, weeds, and you are afraid that you will be weakened? Let's start with herbicides. Post-emergence herbicides are not recommended for a second strike.

What should some farmers do if they are afraid of rain and weeds don't die after herbicides? If the following three conditions are not met, you can hit the second **. It rains immediately after the end of a dozen, heavy rain or torrential rain lasts for a long time, there is no poisoning after 3-5 days for the three-leaf grass and 5-7 days for the sharp-leaved grass, and the corn also grows normally.

On the contrary, if it rains only after 6 hours of taking the medicine, or if the rain is very light, there is no need to fight again. The potion has already absorbed most of it, and will be carefully weakened again. If you really want to shoot twice, be sure to pay attention to directional spraying, not corn.

Again, the different types of pesticides. If it is a pesticide with strong systemic penetration, the active ingredient can generally absorb about 70% in 1 2 hours, and the active ingredient can absorb 60 80% in 4 6 hours if the systemic effect is weak. Therefore, if the injection time has been more than 4 hours since the time of the rain, the liquid medicine will be basically absorbed and there is no need to take another injection.

Of course, if it rains, it will rinse some of the liquid and affect the expiration date.

However, if it rains the next day after taking the medicine, there is no need to spray any more medicine. If it is a contact type of pesticide, especially an insecticide, usually the pest will be poisoned after about 1 2 hours, and the insecticidal effect will appear within 4 hours. Pesticides such as infrared, poisonous snakes, killers, rapid dicarbs, constant flower lamp oil, pyrethroids and other pesticides have strong contact killing, so they are called this contact pesticide protective fungicides (such as Dyson zinc, Dyson zinc, chlorothalonil, etc.) are resistant to rainwater washing, but will affect the effect.

If it rains for a long time in 4 hours or 4 or 8 hours, if it rains, you need to spray again when the weather is good, but you usually only need to replenish half of the dose.

After the rain, there is no effect, because the pesticide is sprayed on the surface of the plant, due to the rain, the pesticide on the surface of the plant is washed down by the rain, so there is no effect.

There is also a medicinal effect, but the effect of pesticides will be weakened. Rain will dilute the unabsorbed pesticides, making them less effective. It cannot give full play to the efficacy of pesticides.

If you take the medicine in the morning on the first day and it rains on the second day, it means that the medicine has already worked, but if it rains, the effect is definitely not as good as if it didn't rain.

Generally speaking, rain after 4-5 hours will not affect the efficacy of pesticides, but fungicides are best to rain 5 hours after application in order to receive effective control effects.

It's okay to spray for how long it rains.

5 hours. Generally, after spraying, if it rains at an interval of 4 to 5 hours, there is no need to spray.

2. The effective time of different agents.

Contact insecticides rain every 3 hours and do not need to be sprayed; The efficacy of the systemic type will be reduced, and the rain will not affect the efficacy of the fungicide 5 hours after application.

However, some fungicides do not need to be sprayed in the drizzle, so after spraying, it should be determined according to the actual situation of the agricultural area used, and there is no unified standard.

3. The time interval between spraying and rainfall.

According to the general rate of pesticide absorption by plants, the active ingredient can absorb about 70% in 1-2 hours, and the active ingredient can absorb 60%-80% in 4-6 hours.

If the spraying time is more than 4 hours away from the rainfall time, then the pesticide solution has been fully in contact with the crop and has been absorbed, which has played a part of the role of inhibiting pathogens or killing pests or inhibiting the metabolism of weeds, and there is no need to respray at this time.

However, the rain will definitely wash away part of the solution, which will affect the duration of the solution. But if you spray today, it will rain tomorrow, and there will be a day in between, no matter what pesticides you do, you basically don't need to spray them.

You said that it would rain an hour after spraying pesticides, so it is recommended to respray.

After 4 hours of spraying, it rained and the fruit trees were not affected. After 4 hours, their medicinal properties have almost evaporated, and there is no need to replenish them after the rain. It is suitable for spraying fruit preservation drugs during the flowering period of fruit trees, spraying pesticides for the prevention and control of pests and diseases within 7-10 days after the wilting of plant flowers, and spraying strong fruit pesticides during the fruit expansion period.

Pay attention to control the concentration when applying, especially in summer, when applying pesticides to fruit trees, the concentration of the liquid medicine should not be too high, so as not to harm the pesticides. First, it doesn't matter if it rains a few hours after the fruit trees are sprayed. The fruit tree will not be affected if it rains 4 hours after spraying the pesticide, so it does not need to be supplemented, because after 4 hours, its medicinal properties have almost evaporated, and it will not be affected by rain.

Pesticide spraying is suitable for fruit trees in the flowering stage, young fruit stage and strong fruit stage. The spraying time of pesticides should be determined according to the temperature. If the temperature is low on the day, it should be done at noon.

If the temperature is high on the day, it should be done in the morning or afternoon to avoid drug damage. 2. What medicine is good for fruit trees? 1.

In the flowering period of fruit trees, it is advisable to use fruit-preserving drugs to improve the fruit setting rate and the yield of fruit trees in the later stage. Growth regulators such as gibberellin and naphthalene acetic acid can be used for drugs, and the concentration should be appropriately adjusted when used. 2.

Insecticides should be applied within 7-10 days after the flowers have wilted to reduce the impact of pests and diseases. The type of pesticide should be determined according to the variety of fruit trees. 3.

During the fruit expansion stage, you can spray a strong fruit to thicken the fruit pedicle to increase the amount of nutrients transported and prevent fruit drop or deformed fruit in the later stage. Three. Precautions for spraying drugs1

Pesticide concentration: when applying pesticides, pay attention to control the concentration, especially in summer, when applying pesticides to fruit trees, the concentration of pesticide should not be too high, so as not to harm pesticides. 2.

Pesticide application time: pay attention to choose the right time when applying, and pay attention not to apply pesticide at noon in summer, because the temperature at noon is relatively high, so there are fewer pests. Noon application not only does not kill pests, but also volatilizes quickly, so the application time should be before 10 a.m. and after 4 p.m.

3.Do a good job of protective measures: pay attention to protective measures when taking medicine, especially in summer, because the high temperature will make the pores of the human body dilate, and the liquid will contact the human body after volatilization, and then be absorbed by the pores, resulting in poisoning.

It will affect the efficacy of the drug, even if the pesticide with a strong grip and slippery systemic foci skin balance, it takes 1-2 hours of absorption time to do it, if it rains just 1 hour after the drug, the rain will wash away a part of the liquid medicine, affecting the duration of the efficacy.

According to the general rate of pesticide absorption by plants, the active ingredient can absorb about 70% in 1-2 hours, and the active ingredient can absorb 60%-80% in 4-6 hours. Therefore, if the time of spraying the fruit has been more than 4 hours from the rainfall time, then the liquid medicine has been fully in contact with the crop and has been absorbed, which has played a part of the role of inhibiting germs, killing pests or inhibiting the metabolism of weeds.

If you choose a pesticide with strong penetration, then the absorption rate of the soil will reach 70%, so there is no need to re-spray.

This is to choose according to different types of Xinpei, for example, like this contact type of pesticides, in fact, there is no need to spray, and there are some such as slippery tung only said that like a protective fungicide, it needs to be sprayed, after the rain, in the case of a round of good weather, it is necessary to spray, but half of the spray can be.

Farmers in agricultural production, pest control of crops, spraying is also the most basic work, but sometimes due to the changeable weather, just after the crops are sprayed with pesticides, it rains, which is still a very depressed thing for farmers, most farmers will think that this medicine is in vain, waste of pesticide money, but also waste of manpower, no effect on crop insecticide and disease control, or herbicide has no effect on weeding.

In fact, in this case, there is no need to worry that there is no effect, let alone repeat the medicine again regardless of it, first of all, we have to see how long the time interval between the spray and the rain is. In general, the action time of pesticides is different for different types, and the absorption time of pesticides is also inconsistent for different crop types.

For example, pesticides with strong internal absorption and penetration can absorb about 70% of the liquid medicine in 1 to 2 hours, and pesticides with weak systemic effect take about 4 to 6 hours, and can also absorb 60 to 80% of the liquid medicine, so it can be judged whether the efficacy will be lost according to the spraying time and the interval rainfall time.

1. The rainfall is less than 10 mm and has a limited impact on the efficacy, so there is no need to repeat the drug In general, if the pesticide is sprayed for more than 4 hours and it rains, there is no big problem, and there is no need to repeat the spraying again. Secondly, it is necessary to combine the amount of rainfall, and the amount of rainfall will also play a key role in the efficacy of the drug. If it rains after spraying, but the rainfall is less than 10 mm, the effect on the effect of the medicine will not be great, and there is no need to spray the medicine again.

2. If the one-time rainfall is greater than 10 mm, the medication can be halved If it is shortly after the drug, the one-time rainfall exceeds 10 mm or more, and the interval between the medication and the rain is less than 8 hours, in this case, it should be considered to spray again to make up, but it does not need to be proportioned like the first spraying, and it can be sprayed by half.

3. 3 days after spraying, look at the effect of the drug is also to see the effect after spraying, if there is rain after spraying pesticides, crop pests and diseases, growth or weeds and so on do not appear obvious effect after three days, then you need to consider repeating the spraying again, and it is best to rotate the pesticides with different mechanisms of action when spraying again, and have achieved better results.

Summary:In agricultural production, spraying pesticides also has a lot of skills, including such situations as rain after spraying, of course, try to avoid spraying pesticides on rainy days, but after spraying pesticides, if you encounter rainy days, then you need targeted treatment, and you can't ignore the size of the rain, the length of the interval between spraying and rain, and the types of pesticides, etc., just care about repeated spraying remedy, and sometimes it will lead to the occurrence of pesticide damage because of excessive dosage, so it is said that remedial spraying after rain also needs to be treated with caution.