Pesticides will fail, how to identify whether pesticides are ineffective?

Heat to see the liquid change method. If there is a condensate in the water emulsion or oil pesticide, you can take a part of the pesticide liquid mixed with the condensate and put it into a glass bottle of suitable size, put it in warm water after sealing, keep the water temperature heated for about an hour, see whether the condensate in the bottle is slowly dissolved, if the condensate can be dissolved, it means that such a pesticide can continue to be used, if the condensate can not be dissolved or it is difficult to dissolve, it proves that the pesticide has deteriorated and failed, and can not continue to be used.

If it can be remixed evenly, and the liquid medicine is no longer stratified after standing for a while, it means that such pesticides can continue to be used, otherwise, it can not be shaken or stratified again, indicating that the pesticide has deteriorated and failed.

If the emulsifiable concentrate dissolves in water quickly, it means that the effect of the drug has not deteriorated. If emulsifiable concentrate appears on the liquid surface and sediment under the liquid surface after dropping into clean water and standing, it proves that the drug has deteriorated and can no longer be used.

For the pesticide that has been stratified in the original bottle, it is allowed to stand for one hour after vigorous shaking, if there is still stratification, it means that the drug has deteriorated and failed. If the delamination disappears, it means that the drug can still be used, but the efficacy has been greatly reduced.

Look at the pesticide production date, regular production pesticide product labels or packaging will have a clear production date, general pesticides mostly have a shelf life of 2 years, except for special pesticides. Therefore, it is generally not recommended to use pesticides beyond the shelf life, which are prone to quality failure and poor effect, and should be collected and disposed of centrally.

If the pesticide packaging is not strict, or when there are problems such as leakage, rupture, and loose sealing, the agent is easy to cause volatilization or material reaction after water absorption and moisture, which will affect the quality of the pesticide and make it invalid. If it is found that there is discoloration, precipitation, delamination or flocculent appearance after the observation of the pesticide solution, it is generally caused by pesticide failure.

** method according to the emulsion pesticide easy stratification of the characteristic, first see whether it is stratified, if not stratified, the pesticide is effective; If layered, it can be up and down several times, so that the pesticide is even, stand for 1 hour, if it is still layered, it proves that the pesticide has deteriorated and failed, if the delamination disappears, it means that it has not yet expired, and it can continue to be used.

To smell the smell of pesticides, it depends on the shape of the pesticides, the shelf life, and the relevant certificates.

It can be confirmed according to the shelf life of the pesticide, confirmed according to the taste of the pesticide, and try not to use expired pesticides, which will definitely affect the plant.

At this time, it can be judged according to the state of the pesticide, and it can also be judged by smelling the taste, you can also check the shelf life outside the pesticide, and then you can also judge whether the pesticide is agglomerating.

Pesticides are synthesized from toxic chemicals, and their chemical properties are relatively active. After opening the pesticide and making it come into contact with the air, it is easy to fail if it is not stored properly, and the use of invalid pesticides will delay pest control.

Generally 7-15 days. The effective period of general pesticides is 7 days, the short 1-2 days, and the long 15 days. The residual effect period of pesticides is generally 60 days for high-toxicity pesticides and 15 days for low-toxicity pesticides.

The shelf life of pesticides is generally about two years, but different pesticides will have different shelf life, so it depends on the actual pesticide.

Generally, it will be completely invalid after 30 days. Different pesticides have different expiration times, and they need to be used up as soon as possible after mixing with water.

Under normal circumstances, the shelf life of most pesticides is 2 years, but there are also cases, such as dichlorvos, acemethamidophos, etc., if the manufacturer's process is not reached, although the validity period of the registration is 2 years, but after one year its content begins to slowly decrease.

When purchasing or using chemical pesticides, it is necessary to identify the quality of pesticides, if the purchase or use of pesticides that have failed, not only cause direct economic losses, but also easily cause pesticide damage, and at the same time, it will also lead to a reduction in yield due to the lack of timely and effective control of pests and diseases. Commonly used identification methods are:

For granular pesticides, first look at the appearance of the agent, if it has already obviously returned to moisture and clumps, the smell of the medicine is not strong or there is another smell, and you can use hand rubbing to participate in the group, indicating that it has been basically ineffective; For emulsion pesticides, let the medicine bottle stand first, if the liquid medicine is turbid or emerges into layers (i.e., oil-water separator), there is sediment or sediment suspension, indicating that the agent is likely to be ineffective.

The heating method is suitable for granular pesticides. Take 5 10 grams of pesticides, put them on a piece of copper and heat, if it causes a lot of smoke and has a strong unpleasant smell, it indicates that the agent is excellent, otherwise, it means that it has long been ineffective. The flotation method is suitable for wettable powder pesticides.

First take a cup of 200 grams of purified water, then weigh 1 gram of pesticides, gently, evenly sprinkle on the surface of the lake and observe carefully, in 1 minute wet and cold and can sink strong electrolytes is not ineffective pesticides, otherwise it is ineffective pesticides.

This method is suitable for wettable powder pesticides. Take 30 50 grams of pesticides, put them in glassware, first put a small amount of water to make it viscous, then add 150 200 grams of purified water and stir, and let it stand for 10 minutes to observe. Among them, the ineffective pesticides have good solubility, the suspended powder in the liquid is fine, the sedimentation rate is slow and the amount of deposition is small, and the ineffective pesticides are the opposite.

** Method applies to emulsion pesticides. For pesticides with water and oil layers, first use a strong medicine bottle and let it stand for 1 hour before observing. If there are still layers, it means that the agent has long been moldy and ineffective.

This method is suitable for emulsion pesticides. Put the pesticide with precipitate into warm boiled water (the temperature should not be too high, 50 60 is appropriate) and observe it after 1 hour. If the precipitate gradually melts, it indicates that the agent is not ineffective, and it can be reapplied after the precipitate is thawed; If the sediment is difficult to melt or does not melt, it means that it has long been ineffective and can no longer be used.

This method is suitable for emulsion pesticides. Take 50 grams of pesticides, put them in a glass bottle, put 150 grams of water, and let them stand for 30 minutes after exerting their strength. If the liquid medicine is a uniform milky white, it means that the agent is not ineffective, otherwise it is an ineffective pesticide, and the more oil bleaching on the top layer, the worse the efficacy.

Check if the product has passed the expiration date. The expiration date of pesticides is generally 2 years from the date of production of the product. If the expiration date is exceeded, the pesticide may deteriorate and become ineffective.

For products within the expiration date, it depends on the change in appearance characteristics. If the powdered pesticide is obviously damp and agglomerate, the smell is not strong or there are other peculiar smells, it indicates that it has become ineffective; Emulsion pesticides should be placed in the bottle for observation first. If the liquid is turbid or stratified, precipitated or flocculent suspended solids, it indicates that there is a high probability of reagent failure.

Remove a small amount of the milky insecticide and place it in a container of water.

After stirring, observe the dissolution. If it immediately turns into a milky white liquid, then it is a real insecticide. If there is oil-water separation or poor dissolution, it is a fake pesticide.

Put the emulsified pesticide precipitated in the bottle into hot water. After 1 hour, the ineffective pesticide precipitate dissolves slowly, while the ineffective pesticide precipitate does not. It is an effective control of crop diseases, insects and weeds.

Due to the toxicity characteristics of pesticides, people often talk about the color change of drugs, believing that pesticides are the main culprits of food safety and environmental pollution, and there are constant calls to resist the use of pesticides.

Integrated control is an effective and sustainable way to control diseases, insects, weeds and rodents, but in actual production, pesticides are still one of the most important control measures, so pesticides are an important means and tools to protect crops and reduce yield loss. The irrational use of pesticides will cause problems such as crop pesticide damage, human and animal poisoning, environmental pollution, and food safety. Especially in developing countries, there are still a large number of highly toxic pesticides, and farmers have low technical level and lack of necessary pesticide safety protection equipment.

Excessive pesticide residues not only affect the quality and safety of food, affect the health of consumers, but also affect the export of agricultural products, and even affect the development of the agricultural industry. Strawberry chips have had a significant impact on the production and sales of strawberries in China, affecting consumers and causing huge losses to farmers. Prevent and reduce the occurrence of pesticide risks.

It is necessary to vigorously popularize the technology of integrated pest control, reduce the use of pesticides, vigorously promote biological control technologies, including biological pesticides, strengthen technical training on the safe use of pesticides, and especially strictly implement the regulations on the use of pesticides.

I think the best thing to do is to look at the expiration date on the label, if the expiration date is past then the pesticide is likely to be ineffective.

The best way to tell if a pesticide is failing is to test the odor of the pesticide, because the failed pesticide volatilizes too much, and the smell will become very weak.

The first thing is to look at the production date, and the second is to see whether the pesticide has the phenomenon of agglomeration, or whether it is different from other normal pesticides.

Look at the appearance of the pesticide, look at the composition of the pesticide, look at the shelf life on the pesticide bottle, and look at the effect, so that you can know the effectiveness of the pesticide.

If the pesticide has failed, it does not have a particularly strong, strong flavor, it will not melt when put in water, it will clump and float on it.

I think it can be distinguished by color, smell, appearance, efficacy and production date.

It is necessary to pay attention to the state of pesticides, the effective time of pesticides, the certificate of pesticides, and the relevant certificates of pesticides.

Observe the color of the pesticide and then touch it, if the color becomes very dark, and it feels very sandy to the touch, and there is no graininess, it means that it has become invalid.

It can be judged according to the quality of the pesticide, the taste of the pesticide, the appearance of the pesticide, and the expiration date, and try to choose some suitable brands to buy.

Speaking of the word pesticide, everyone should be very familiar with the pesticide is a commonly used drug in the agricultural field, it is a chemical agent used to control pests and diseases and regulate plant growth. There are many types of pesticides, and the methods of use are similar, and they play a vital role in agricultural production. Any product will have a shelf life, then, of course, pesticides are no exception, and they will also face similar problems, such as failure problems.

Presumably, when farmers buy pesticides, they will have some considerations in their hearts, and they will think about whether the pesticide is pure or not, whether there is a failure problem, and only a good pure pesticide can play the role of pesticides when spraying. In this regard, we have the following methods to identify whether the pesticide is ineffective.

First of all, it is direct observation, if the characteristics of the pesticide are powdery, you can first observe whether there is obvious dampness and caking on the appearance, smell the smell of the medicine with your nose, if there is a caking phenomenon, and the smell is abnormal, it means that the pesticide is basically ineffective. For the emulsion type, you can first let the bottle stand to observe whether the liquid is stratified, if there is sediment or flocculent, it means that the pesticide has failed. Or shake the drug vigorously first, and then let it stand for observation, if there is still delamination, it means that the drug is ineffective.

Second, we can take a small part of the pesticide in an appropriate way and heat it on a metal sheet, and the normal pesticide will produce white smoke and a strong pungent odor. If there is no above phenomenon, it can also mean that the pesticide has failed. Third, for wettable powder pesticides, a small amount of pesticides can be weighed and put in water to observe the speed of their sedimentation and the solubility of the pesticides.

Whether pesticides play a good role will have a different effect on our crops, a good identification method can allow us to quickly and effectively identify good pesticides, alleviate the concerns in our hearts, and wish our farmers a good harvest every year.

I usually only judge by the production date, and if the date is over, it will definitely be invalid.

I know four ways to identify, the first is the intuitive method, for pesticides that have not been used, you can directly check their production date and shelf life, and observe whether the outer packaging is damaged, leakage and other abnormalities, so as to determine whether the pesticide is effective; The second is the heating method, this method is suitable for pharmaceutical pesticides, take an appropriate amount of pesticides and put them on a piece of metal for heating, if a large amount of white smoke comes out, and accompanied by a strong pungent smell, this indicates that the pesticide is effective; The third is the floating method, which is suitable for wettable powder pesticides. Take a cup of 200 grams of water first, then weigh 1 gram of pesticide, gently and evenly sprinkle it on the water surface and observe carefully, it is an effective pesticide that is moistened and can sink in water within 1 minute, otherwise it is an invalid pesticide; The fourth is the oscillation method, which is suitable for emulsion pesticides. For the pesticide with oil-water stratification, shake the agent vigorously first, stand for 1 hour and observe, if there is still delamination, it means that the pesticide has deteriorated and failed.

At this time, you can judge according to the production date, but also according to the state of the pesticide to judge, if the pesticide has a particularly serious agglomeration, it means that it has expired, and then you can also put the pesticide in the water, if there is a stratification situation, it means that it has expired.

In the planting of crops, if you want to make the crops grow better, you must be inseparable from the growth of pesticides. Although pesticides have a certain amount of quality, the rational use of pesticides will promote the development of agriculture and allow farmers to have a good harvest. As we all know, pesticides have the effect of controlling pests and weeds.

Reasonable use of pesticides, it will make crops grow better.

The use of pesticides also has certain requirements, if the operation is improper, it may cause the use of pesticides to be ineffective, which not only leads to a waste of resources, but also increases labor costs. In the process of using pesticides, pesticides become ineffective, and there are possible reasons.

1. Too much water ratio.

As we all know, spraying pesticides is to mix a certain proportion of water, if the proportion of water is too much, it will also affect the medicinal properties, and even make the spraying pesticide ineffective. Therefore, when spraying pesticides, be sure to check the precautions for pesticide use, especially in the proportion of water.

Second, heavy rain washing.

Just after spraying pesticides, before the properties of the pesticides could take effect, heavy rain fell. This is also the cause of pesticide failure. The ancients said:

People look at the sky to eat, which also truly reflects the meaning of this sentence, when spraying pesticides, you can first look at the weather forecast, in determining whether to spray pesticides.

3. Produce medicinal properties.

Whether it is a weed or a pest, it is known that if too many pesticides are used, they will develop resistance operations. Spraying pesticides to prevent pests or weeds can be beneficial, but pesticides can play a role in selection. After long-term selection of pesticides, the resistance is generally relatively high, or even non-druggable.

Therefore, when choosing pesticides, you can change the brand you don't want to use pesticides.

Although pesticides have certain harm to the environment, the rational use of pesticides is conducive to promoting agricultural development and improving farmers' harvests.