What four points should not be ignored when vegetable farmers spray pesticides in the high temperatu

In the middle of summer, it is best to spray pesticides in the morning and evening, mainly for the following reasons.

Spraying pesticides in the morning and evening is more effective than at other times, especially in the middle of the day.

First of all, we need to know that the living habits of most insects are nocturnal and diurnal, and the frequency of activity in the evening or nocturnal is much higher than at other times. Typical such harmful insects are cotton bollworm, dark golden beetle, African mole cricket, soybean poison moth, rice borer, peach borer, and rice leaf roller. Most of them are also insect pests that are afraid of light and heat.

Especially in the summer, the sun is strongest at noon, so it will be avoided at noon, so it is best not to apply the pesticide at high temperatures at noon, the effect will be much worse.

2.Spraying pesticides in the morning and evening has a long effect.

Pesticide liquid, generally have the characteristics of volatile and easy to decompose, if it is in the morning and evening, the molecular activity in the air will be more stable than at other times, at this time the application, the liquid medicine is not easy to volatilize and transpirate quickly with the air molecules, and the effect time will be much longer.

3.It brings less pesticide damage to crops.

In the morning and evening, the stomata on the surface of the object are closed, and the breathing is slow, and the water is not easy to evaporate. At this time, the powder or acid-base components in the agent are not easy to destroy the physiological functions and tissues of the crop, so that the young part of the crop will "wilt" or the leaves will produce "burn spots".

4.Morning and evening application of pesticides can reduce adverse effects on human health.

The temperature is low and windy in the morning and evening. If it is in the case of high temperature and no wind at noon, pesticides volatilize into the air, the concentration of drug molecules in the air is easy to increase, these polluted and poisoned air enters the human body through the respiratory tract or capillaries, and the human body's resistance decreases under high temperature operation, often produces pesticide poisoning and heat stroke syndrome, which is easy to cause life danger, and accidents of pesticide poisoning occur from time to time every year. Therefore, it is better to choose a cloudy or sunny day in the evening.

Therefore, under the high temperature in summer, it is best to spray pesticides in the morning and evening, so that the pesticide effect will be better.

It can absorb these pesticides well, can evaporate water, can kill these germs well, will not affect the yield of crops, and will not produce pesticide damage.

Because the temperature in the morning and evening is not very high, the effect of pesticides will be relatively good, and it is good for crops, so it is recommended to spray pesticides during this time period.

Because the temperature of these two times is relatively low, it is avoided that the drug will evaporate due to high temperature, resulting in poisoning of the applicator.

Due to the relatively low temperature of these two times, applicator poisoning due to the evaporation of the drug at high temperatures is avoided.

At noon, the temperature is extremely high and the evaporation is rapid. It can be said that just after the fight, the back is basically dry, which is a serious waste and cannot achieve the effect. The first point is, don't choose to take medicine at noon, so when is the best time?

Here, it is advisable to choose 7-9 o'clock and 16-19 o'clock. These two time periods are OK.

Wear less clothes in the summer, and the potion will easily stick to the **. When exposed to the sun, it can cause symptoms such as allergies and poisoning. In addition, it is necessary to take a shower in time after taking the medicine.

Some friends felt that they evaporated quickly in the summer, so they privately increased the concentration and considered vaporizing some, which had little effect on efficacy. In fact, this thinking is wrong. It is easy to cause drug damage and burn leaves.

Use fast-acting strong systemic pesticides. Choose fast-acting pesticides such as melofen, succulin, and octyl cyanogen EC, which have strong toxic effects. Pests can be killed 1-2 hours after use.

Choose pesticides with strong systemic properties, such as promethazine and methametha. After 4-5 hours of use, more than 80% of the active ingredients can be absorbed by the crop into the internal tissues, killing pests and bacteria even when it rains. Add the right amount of adhesive and water treatment agent.

Wettable powders have poor adhesion to pesticides. When preparing pesticides, add 100-150g of soybean flour or laundry detergent per 100kg of liquid medicine to improve the use effect of pesticides.

In order to improve work efficiency or enhance the control effect, some farmers often increase the amount of pesticides, reduce the dilution rate of pesticides, and arbitrarily increase the concentration of pesticides, even in the high temperature season in midsummer. However, this is not the case. Water evaporates quickly under scorching sun and high temperatures.

If the concentration of pesticides is too high, it is easy to cause pesticide damage to plant leaves. In agricultural production, due to the hot summer weather, some friends will mix herbicides, insecticides, and fungicides. This is undesirable and must be done with caution.

For example, it is not recommended to mix herbicides and insecticides, and organophosphate insecticides cannot be used for a week before and after the use of the corn herbicide nicosulfuron.

In the environment of high temperature weather, spray pesticides at 5 o'clock in the afternoon, this time will not lead to the volatilization of pesticides, you must pay attention to your diet when using pesticides, you need to take protective measures, put them in the shade, and then spray some water after spraying.

First, do not use high-toxicity and high-residue pesticides. At present, high-efficiency and low-toxicity pesticides can replace high-toxicity and high-residue pesticides, and there is no need to use those pesticides that are on the verge of elimination, high toxicity and poor efficacy. The second is to pay attention to the spraying time and avoid the high temperature period as much as possible.

When using drugs at high temperatures, people are easy to be poisoned, crops are prone to pesticide damage, and the prevention and control effect is not good, so it should be avoided as much as possible. The third is not to fatigue the medication. The elderly, the weak, the women and the young have poor resistance, and it is not suitable to participate in the work of disease prevention and insect control.

If you feel tired with medication, you should wash and rest in time.

First of all, avoid the noon time when spraying, because many chemicals are very volatile, and if you spray chemical pesticides when the temperature is particularly high, it will affect the effect. It is also best not to spray in rainy weather, you should pay attention to physical protection when spraying, do not touch **, and you can wear protective clothing when spraying.

When using, we must avoid the time when the temperature is relatively high, and when using pesticides, we must pay attention to the composition of pesticides and the concentration of pesticides, do not use too much at one time, and also need to do a good job of personal protection.

Let's take a look at some of the things that must be paid attention to when spraying pesticides at ultra-low temperatures, so as to ensure the harvest and quality of crops.

Every step of the way is important, and not only these five items, but also many emergency situations that must be effectively addressed.

1.with chemical fertilizers. There are some chemical fertilizers (such as dimethoate) that are very harmful by temperature, and their medicinal power is significantly weakened with the decrease of environmental temperature, while some chemical fertilizers (such as dimethoate, etc.) are less harmful by air temperature, even at lower ambient temperatures, can also stimulate its conventional insect repellent effect.

Similar to dimethoate, there are also pyrethrins, etc., which are more toxic at lower temperatures than at continuous high temperatures. Therefore, to prevent crop diseases in the ultra-low temperature season in spring and winter, it is necessary to pay attention to the use of chemical fertilizers that are less harmful to temperature.

2.Increase the dosage moderately. When using chemical fertilizers at ultra-low temperatures, the dosage should be moderately increased under the guidance of professional and technical personnel, and the concentration value of the chemical solution should be increased, but it should not exceed the "safe concentration" (that is, the maximum allowable dosage that does not produce fertilizer damage).

3.The dosage should be reasonable, spray the pesticide according to the basic dosage in the summer, and the insect infestation usually kills from food and medicine. In late winter and early spring, because of the climatic factors, the chemical fertilizer is slow to give full play to the medicinal power, therefore, when the medicinal power is low, the concentration value can be reasonably increased, the actual temperature depends on the amount, but generally does not exceed the basic dosage.

4.Improve spraying methods. In spring and winter, prevent crop diseases in greenhouses, and use smoke or smoke spraying as much as possible; If spraying is used, the frequency and amount of prevention and control should be reasonably reduced to avoid the humidity of the environment in the shed.

5.Safety observation period for chemical fertilizers. The use of chemical fertilizers in winter and early spring, the dissolution rate of chemical fertilizers slows down, and the residual period of chemical fertilizers in the body of crops also increases relatively.

In addition to these five major issues, other elements of farmers and friends also need to pay attention to it, so as not to jeopardize the actual effect of chemical fertilizers, resulting in poor profits.

First of all, we must pay attention to the setting of temperature, but also should appropriately increase the dosage, pay attention to the proportion of pesticides, and should be sprayed on sunny days, avoid rainy days or windy weather, and also need to appropriately extend the safety interval, which can improve the effect of pesticides.

These five key points are to choose pesticides reasonably, increase the amount of pesticides appropriately, choose high temperature weather for spraying pesticides, improve the method of pesticide application, and extend the safety interval of pesticides.

First of all, it is necessary to avoid the use of low temperatures, or you can choose to use it at 10 or 11 o'clock in the morning, and then after spraying pesticides, you must pay attention to the airtightness, and then you must do a good job of ventilation, and the most important thing is to pay attention to the appropriate type of pesticides.

Generally speaking, it is not recommended to spray pesticides at high temperatures, because they have a certain impact on human health, after all, high temperatures are also easy to cause heat stroke, so most people are not recommended to use pesticides at high temperatures. But there are always times when we need to spray pesticides at high temperatures, and if we have to use them at high temperatures, we should pay attention to some things, so that we can have a better effect and effectively protect ourselves. <>

Before spraying pesticides, be sure to do a good job of self-protection, wear long pants, gloves, and masks to avoid being exposed. Pesticides will have a certain degree of toxicity, for the staff who spray pesticides must know how to protect themselves, if the pesticide residue to our **, it is easy to cause discomfort, so wear long pants and long clothes and wear masks, if necessary, also bring this goggles.

When spraying pesticides, do not go up to the wind, but choose to spray in the direction of the tuyere. The spraying of pesticides is also a certain exquisite, if the wind is likely to cause these pesticides to blow to us, which is not conducive to our health, but also not conducive to the balanced dispersion of pesticides, so we should pay attention to this. <>

When choosing pesticides, it is best to choose some pesticides that are resistant to high temperatures, and the concentration should not be too high. Because the temperature is too high, pesticides are very volatile, easy to lose some medicinal properties, and pesticide residues on crops are not long enough to produce a certain effect, so we must choose pesticides that are resistant to high temperatures. Pesticides resistant to high temperature can effectively avoid physical reactions, so they can be effectively protected, and pesticides will have an impact on crops after spraying.

In fact, it is recommended not to spray pesticides in hot weather, you can choose to spray pesticides before 10 o'clock in the morning or after 4 o'clock in the afternoon, and avoid the high temperature season to make the pesticide fully exert this effect。For the use of high temperatures, it is very likely to produce pesticide damage, after all, when high temperature meets water, it is easy to burn spots, which is not conducive to the growth of crops.

I think try to avoid going at noon, and the density of the pesticide applied should be as small as possible to reduce the dosage.

In hot weather, we should never spray pesticides, do not spray pesticides in the sun. If it is the day before yesterday, you should choose to spray pesticides at 8 or 10 o'clock in the morning, or you can choose to spray pesticides after 5 o'clock in the afternoon.

First of all, it is necessary to avoid the time when the temperature is relatively high, and be sure to choose to use it in the morning or evening, and when using pesticides, you must pay attention to the concentration of pesticides, and you should also pay attention to the varieties of pesticides, and you should also dilute them with water in advance.

After the rainy season, the temperature gradually rises. With the growth and development of crops, spraying pesticides on crops is also an indispensable stage. However, in the process of spraying, it will be found that the effect of spraying is not very good, and farmers think that there is a problem with chemical fertilizer, but in fact it is not.

Do you really have to master how to spray pesticides? Spraying pesticides on hot days, are you really spraying correctly? Farmers should not be inappropriate, otherwise the money may not have practical results.

So how do you spray pesticides in hot weather? In fact, it is not so difficult, just grasp this key point, you will be able to get started simply, the author will describe to farmers and friends, how to spray pesticides in high temperatures, without damaging crops and can fully give full play to the power of chemical fertilizers.

1. Choose the time to spray pesticides in general after noon, when the temperature is a senior title, can do more than 30, and the sun irradiation is strong, spraying pesticides, the play of the medicine will also be strong, it will easily lead to the poisoning of the sprayer, followed by this temperature, the vast majority of insect pests will also hide in the shade, that is, the LED backlight of green plants, the volatiles of the drug are fast, and the spraying can not be pested, so the effect of spraying at this time is not too big. The appropriate method is generally in hot weather conditions, and the spraying time period should be before 10 o'clock in the morning and after 4 o'clock at noon. The temperature is around 25, which is more suitable.

If it's spring and autumn, choose between 11 a.m. and 2 p.m.

2. In the case of spraying, what kind of climate should be selected? It can be selected to wear a hat on a rainy day in a rainy mountain, if the wind is very strong, stop spraying, because the spraying is uneven at the moment, it is very easy to cause damage to crops. Naturally, you can't choose a rainy day, because the medicine sprayed at this time will be washed away with precipitation, which is equivalent to white spray, and has no practical effect at all.

3. According to the characteristics of the disease to clearly prevent whiteflies (fly away when touched), spray before the dew drops dry in the morning; To prevent diseases, spraying is carried out before the rain, before the rain, before the rain, and before the rainy day (because many diseases are spread by water, wind and rain, this is the best time to prevent disease spraying).

4. The fertilizer must also be moderately applied according to the indication, which can be slightly supplemented according to the obvious degree of pests, but it cannot be doubled, otherwise it will not play a role if the money is spent. If the pesticide can not achieve the actual effect of pest control, on the one hand, you can change to another chemical fertilizer, on the other hand, you can improve your own spraying technology, such as the above method, must be bypassed.