What must be paid attention to when spraying pesticides in hot weather?

In agricultural production activities, in order to improve the survival rate of crops, so that crops can be high-yielding, so they often spray pesticides in the process of crop production to kill pests and diseases. However, pesticides as a kind of chemical agents, in the process of wide application, there are inevitably some potential safety hazards, today we will talk about it, if we encounter high temperature weather, then we spray pesticides in this weather, what should we pay attention to.

First, avoid bright light. Because in high temperature and strong light, most of the pests will hide in the cool backlight, at this time, not only can not kill the pests, but also the drug decomposes too quickly, resulting in volatilization loss, poor insect control effect, and will cause poisoning of the required personnel.

Second, don't change the pesticide concentration casually. For high temperature weather, water volatilization is faster, and the concentration of pesticides sprayed at this time is too high, which is easy to cause critical damage to the leaves of crops. For farmers, it is not advisable to blindly increase the amount of pesticides, increase the concentration of liquids, and reduce the dilution ratio in order to improve the spraying efficiency, or to enhance the control effect.

For pesticides of water agent and wettable powder, we can add an appropriate amount of synergist when configuring pesticides, so that we can effectively improve the adhesion of pesticides and enhance the use effect.

Finally, it is necessary to choose a low temperature, no rainy day when spraying pesticides, in addition to the pesticide toxicity, to determine the safety interval of friends, at the same time, the selection of pesticides with fast acting and strong systemic is also a good way. One thing to be reminded is not to think that the closer the nozzle is, the better the effect will be if the spray is not wasted, this kind of thinking is wrong. Because large drug droplets are particularly easy to cause pesticide damage to crops, it is necessary to select a certain distance range to make small droplets easier to deposit and spread on the target.

To sum up, it is the basic matters that we should pay attention to when spraying pesticides in hot weather. We should spray pesticides reasonably according to the instructions for the use of pesticides to avoid harm to ourselves and pay attention to the safety of pesticide use.

First of all, avoid spraying in the middle of the day. Secondly, try to choose cloudy days without rain to spray. Third, do not arbitrarily increase the concentration of the liquid medicine.

Fourth, select fast-acting and systemic pesticides. Fifth, add adhesives and water agents to aqueous and wettable powder pesticides. Sixth, determine the safety interval of spraying according to the toxicity of pesticides.

In life, farmers spray pesticides in hot weather, and they must pay attention to safety. Because if you spray pesticides in this hot weather, the smell will be very strong, and there is a possibility of poisoning. The weather is very hot and there may be heat stroke, so farmers need to wear masks, hats, sun protection, and gas masks if possible.

Do not use pesticides in hot weather, and be sure to water in time after using pesticides, and at the same time should do a good job of personal protection.

<> at noon, when the stomata on the surface of the object are opened, the breathing is vigorous, and the evaporation of water is intensified. At this time, the powder or acid-base components in the agent are applied to the stomata of crop leaves and stems, increasing the burden of crop water supply, destroying the physiological function and organizational mechanism of crops, and causing the young parts of crops to produce "wilting" or leaves to produce "burn spots". The body temperature of pests changes with the change of environmental temperature, and when the ambient temperature is too high, it will interfere with the normal metabolism of the insect and cause the physiological function of the insect to be disordered.

Therefore, at noon, when the temperature is hot, pests take refuge in the shade, some lie still on the back of the leaves, some hide in the crevices of the nearby grass, and some lurk under the old bark of the branches or burrow into the tree holes.

The vast majority of plants, the required nutrients, in the case of low temperature absorption effect is the best, and in the morning due to the dew is larger, undoubtedly greatly reduce the proportion concentration of pesticides, at the same time because of the large dew of crops, at this time, a part of pesticides drip to the ground with the dew, thereby reducing the use of pesticides adsorbed to the foliar surface of crops, reducing the use of crops. The ability to significantly improve the efficacy, after a night of absorption, the absorption and utilization rate of endogenous pesticides is higher, if in the strong sunlight in summer, there will be some transpiration and volatilization after atomization of the liquid medicine, reducing the efficacy, and it is easy to produce pesticide damage to the fruit surface leaves, and the commodity rate decreases.

Too hot at noon, pesticide spraying is easy to dry, so it does not play much role in insects, and another is that people sweat a lot when spraying pesticides because the weather is too hot, and pesticides are easy to be poisoned when sprinkled on the body, generally wait for the dew to spray pesticides or spray the best in the afternoon, I think so, sprayed pesticides are emitted into the air, forming a non-flowing pesticide aura. At this time, people are working in high temperatures, sweating, the pores of the human body are open, and the drugs emitted in the air enter the capillaries through the pores, plus breathing into the lungs, people are easy to be poisoned by medicine, and the heavy ones die, and the light ones are hospitalized and take medicine.

Pesticides can also be sprayed in hot weather, but the effect is not very good. The precautions for spraying pesticides are: first, you must take protective measures, wear masks, gloves, protective clothing, etc., and try not to touch pesticides with your hands.

Second, do not drink alcohol after spraying pesticides, which can easily lead to poisoning.

If you can spray pesticides in hot weather, pay attention to the appropriate amount when spraying pesticides, not too much and not too little, pay attention to even spraying, and pay attention to personal protection.

Yes, avoid spraying in the middle of the day.

Spraying chemical pesticides when the temperature is high and the light is strong around noon, first, the agent is highly volatile, which is easy to cause poisoning to the applicators; Second, most of the pests are hiding in a cool backlit place, spraying is not easy to hit the target, at the same time, the pesticide decomposition is fast, volatilization loss is large, and the insect control effect is not ideal.

The reason is very simple, in hot weather, if the pesticide is sprayed at noon, it will affect the pesticide and increase this volatilization, which will lead to the inability to give full play to the efficacy. Pesticides are sprayed after water and drugs are fully stirred, the temperature is too high at noon, if we go to spray, then it is easy to volatilize these waters, and will soon be dried by the sun, and the time for these drugs to remain on crops will be greatly reduced, which is not conducive to the absorption of pesticides by crops, is not conducive to disease prevention and control, and is not conducive to insecticide. <>

We spray pesticides just to treat diseases and kill insects, and many insects will not come out at noon, basically they are hidden, after all, the habits of insects are active in the morning and evening. We only choose to spray pesticides when the insects are active, then the effect will be very obvious, if we choose to hide the insects at noon, we spray pesticides basically will not have much effect. <>

Spraying pesticides at high temperatures at noon will be prone to pesticide damage. In fact, the temperature is very high at noon, crops are basically in a state of heat dissipation, if spraying pesticides at this time, the water of pesticides is either warm or cold, pesticides contact crops will have a physical reaction, when high temperature meets low temperature, it will naturally affect the growth of crops, it will be easy to burn spots, and even root burning, so it will choose to use pesticides in the morning and evening. <>

Spraying pesticides in the morning and evening has a great advantage, the temperature is not high in the morning, so it is more conducive to the crops to absorb these pesticides, which can have a good effect on preventing some bacterial diseases and insecticide. Pesticides are sprayed on crops, it needs to have an absorption time, about 3 or 4 hours, and it is often better to absorb when the temperature is not high, generally speaking, it is more appropriate to absorb between 20 and 30 degrees, and more than 30 degrees will often have an impact.

This is because when spraying pesticides in hot weather, they are particularly volatile and play a relatively low role, so spray pesticides in the morning and evening.

Mainly because in high temperature weather, if the temperature is the highest to spray pesticides, it is likely to cause the pesticides to volatilize too quickly, and then before they have played a substantial role, they have been volatilized.

Because of the high temperature weather, pesticides are easy to volatilize, and the effect can not be completely applied to crops, so pesticides should be sprayed in the morning and evening.

This is because in hot weather, pesticides melt too quickly, which will cause pesticide damage, which is not conducive to the growth of crops, so spray pesticides in the morning and evening when the weather is cool.

Spraying chemical pesticides when the temperature is high and the light is strong around noon, which is highly volatile and easy to lead to poisoning of pesticide applicators; Pests mostly hide in shade and backlight, and spraying is not easy to hit the target. At the same time, pesticides decompose quickly, volatilization losses are large, and the pest control effect is not ideal. If it is a sunny day, spraying should be done after 8-10 a.m. after sunrise or after 5 p.m. before sunset, when the pest is active.

When the wind is strong, the spraying should be stopped, otherwise it will cause uneven spraying and easy to cause pesticide damage. Due to the rapid evaporation of water under the scorching sun, it is easy to cause chemical damage to plant leaves if the concentration of pesticides sprayed is too high. Avoid overfilling the bucket.

Some farmers like to pour the potion into the sprayer barrel when spraying. This is not only not conducive to spraying, but more importantly, if the sprayer cover is not closed tightly, the sprayer will spill out and stick to the body when walking in the field, which is easy to cause poisoning in the high temperature season.

Environmental conditions such as high temperature, strong light, and high humidity will cause some pesticides to cause pesticide damage to some crops. For example, in the case of high temperature and drought, spraying sulfur powder on watermelon to control the disease can easily cause serious pesticide damage. Another example is the use of sulfafen to weed soybean fields.

Under drought conditions, soybean leaves are prone to pesticide damage. Spraying chemicals at high temperatures causes water to evaporate too quickly and the liquid accumulates at the lower end of the fruit or leaf; Spraying herbicides at high temperatures can cause transpiration, or excessive humidity can lead to uneven application of chemicals on the surface of the fruit. The use of powder and emulsifiable concentrate drugs in the young fruit stage or coloring stage leads to the appearance of drug spots on the surface of the fruit; Some drugs that choose to be dispensed are unstable at high temperatures, and there is no secondary dilution, resulting in uneven mixing and distribution of liquid medicine, resulting in different concentrations causing drug harm, and in a high temperature environment, the liquid water evaporates quickly, which is equivalent to increasing the concentration of liquid medicine.

If the liquid is diluted or the concentration ratio is increased, the concentration will be too high and cause damage to the drug.

In order to improve work efficiency or enhance the control effect, even in the high temperature season in midsummer, the amount of pesticides will be increased at will, the dilution ratio of pesticides will be reduced, and the concentration of liquid medicine will be increased. Due to the rapid evaporation of water under the scorching sun, it is easy to cause chemical damage to plant leaves if the concentration of pesticides sprayed is too high. It is not suitable for using medicine when it is windy, because the wind is easy to cause the powder or droplets to fly with the wind, which can not be evenly attached to the surface of the crop, and will float on the pesticide applicator, which is easy to be poisoned.

Spraying rainwater on rainy days can directly wash away chemicals, which not only affects the effect, but also causes water pollution. The chemicals used for seed dressing are less affected by rain. Emulsifiable concentrate pesticides can form an oil film on the surface of crops and have a certain resistance to further rain erosion, while powders and wettable powders have the weakest resistance to rain erosion.

When spraying pesticides in summer, you should choose the morning or evening of cloudy days, do not choose the morning and noon when the temperature is high, and then wear the whole, wear masks and gloves to prevent pesticides from being sucked by yourself.

The concentration of the agent should be adjusted reasonably according to the change in temperature. Pay attention to the quality of the spray. Spray reasonably to prevent poisoning.

Use fast-acting systemic pesticides. The safety interval for spraying is determined according to the toxicity of the pesticide. Pay attention to the dilution factor and the tightness of the nebulizer.

Improve the utilization rate of pesticides.

1. There are two reasons not to spray at noon:

1. At noon, the temperature is extremely high, and the evaporation is fast, so it can be said that just after the fight, the back is basically dry, the waste is serious, and the effect of the medicine cannot be reached.

Second, physical health problems, spraying at noon is easy to cause heat stroke, causing danger.

2. Selection of spraying time.

The first point is to say, don't choose to take the pill at noon, so what is the best time? Here it is recommended to choose 7-9 o'clock, 16-19 o'clock, these two time periods are OK.

3. Pay attention to the contact between the medicine and **.

Wear less clothes in summer, the liquid medicine is easy to get on the **, after the sun exposure, it will cause allergies, poisoning and other symptoms, in addition, take a bath in time after the medicine.

4. Do not increase the concentration of the liquid medicine at will.

Some friends feel that the summer evaporation is fast, so they privately increase the concentration, thinking that evaporating a part of it will have little effect on the efficacy, in fact, this idea is wrong, it is easy to produce drug damage, and there is a situation of burning leaves.

Avoid spraying in the middle of the day when the high temperature and strong light, most of the pests are hiding in the shade and backlight, and the spraying is not easy to hit the target, so choose a cloudy day without rain spraying. Attention should be paid to physical protection and contact with pesticides should be avoided as much as possible.

1. Avoid spraying at noon high temperature and strong light. Spraying chemical pesticides when the temperature is high and the light is strong around noon, first, the agent is highly volatile, which is easy to cause poisoning to the applicators; Second, most of the pests are hiding in a cool backlit place, spraying is not easy to hit the target, at the same time, the pesticide decomposition is fast, volatilization loss is large, and the insect control effect is not ideal. 2. Choose sunny days, morning and evening, or cloudy days without rain.

If it is a sunny day, spray should be sprayed after 8-9 a.m. after sunrise or after 5 p.m. before sunset, when pest activity is at its peak. 3. When spraying pesticides in summer, you should pay attention to physical protection and try to avoid contact with pesticides.