How can you tell if a pesticide has failed?

Whether in rural or urban areas, as long as it involves crops, seedlings, and even various flowers and plants, pesticides are used to a greater or lesser extent. However, we must be clear that the rational use of pesticides can promote the growth of crops and vegetation. However, when pesticides expire or fail for various reasons, not only do they not work, but they also delay the time for crops to grow or produce high yields.

How can you tell if a pesticide has failed?

For powdered pesticides, first look at the appearance of the drug, if it has been obviously damp and agglomerate, the smell of the medicine is not strong or there are other peculiar smells, you can use your hands to rub into a ball, indicating that it is basically ineffective; For emulsion pesticides, let the bottle sit first. If the liquid is cloudy or layered (i.e., oil-water separation) and there is a precipitate or floc in suspension, the drug may have failed. Place the medicine in a clean utensil and rinse well with running water.

For oil pesticides, you can pour the agent on your hand and press the surface of the agent with your fingers, and white precipitate immediately appears on the surface of the agent, indicating that it has all failed.

In addition, the pesticide bottle mouth and bottom should be brushed with a layer of soap so that it can be well attached to the surface, and after cleaning, rinse with running water. The bottle should be rinsed with running water and then cleaned with soap. (Liquid, you can use a disposable autoclave or autoclave bottle, pour the pesticide into it and heat, the sterilization time should be within 3-5 minutes, to prevent the pesticide from deteriorating due to water loss.)

Spraying pesticides on fruit trees, first look at its appearance, if it has been significantly damp and agglomerate, the smell of medicine is not strong, but there are other peculiar smells, and can be rubbed into a ball by hand, it means that it has been effective, you can pour the agent into the container containing the plant, and then look at its appearance, if there are other peculiar smells, and there is a sound of falling, it means that the agent has been invalid. If the appearance of the liquid medicine is normal, and the smell of the medicine is not strong or has a peculiar smell, and there is no other peculiar smell, or the medicine also has a certain anti-fogging performance, it means that it has been basically effective. That's all for this issue, thank you**.

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At this time, you can judge according to the production number outside the pesticide, and then you can also judge according to the composition and state of the pesticide.

Directly, if the color of the pesticide is different from before, and then the taste has changed, the pesticide has become ineffective at this time, and there is no way to continue to use it.

You can judge by color, or by doing chemical experiments, or by using emulsions, or by looking at the expiration date.

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.

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.

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.

It is likely that the pesticide volatilizes because of poor sealing, or because the pesticide is damp, or because the pesticide has been stored for too long, which will cause the pesticide to fail.

It is likely that it is because of the storage time is relatively long, it may be due to the influence of rain, it may be because of the humidity, it may be because the light time is relatively long, it may also be because it is affected by rain, it may be because other pesticides are stored together when it is stored.

1. Observation method: the powder pesticide is obviously lump or kneaded into a lump by hand, which is not easy to crush, indicating that the drug has long been ineffective and cannot be applied. The moisture content of powder pesticides is generally below 55%, and the lump is caused by storage for a long time and excessive moisture absorption, which dissolves the relevant ingredients.

If the emulsion pesticide finds that there is sedimentation and layered flocculation in the pesticide, the medicine bottle can be put into boiling water and left for 1 hour, if the precipitate is dissolved, the flocculent subsides, indicating that the pesticide is reasonable; Otherwise, it cannot be used.

2. Cautery method: This method is used to identify powder pesticides. Take 10 20 grams of powder pesticides, put them on the copper sheet and put them on the fire, if there is smoke, it is confirmed that the pesticide is not ineffective, otherwise it indicates that it has been ineffective, and this method is generally used to evaluate 5% of Duoyinling powder.

3. ** method: This method is used to identify emulsion pesticides. According to the characteristics of emulsion pesticides that are easy to stratify, first of all, whether they are stratified or not, if they are not stratified, it indicates that the pesticide is reasonable; If layered, it can fluctuate left and right many times, make it even, let it stand for 40 60 minutes, and then carefully observe, if it is layered again, it indicates that the pesticide is ineffective and can not be used.

4. Dissolution method: This method is used to identify the deposited emulsion pesticides. Soak the bottle in 40 60 water for 60 minutes.

If the sediment at the bottom of the bottle melts, it means that the pesticide is not ineffective. If the precipitate does not dissolve, the precipitate can be filtered out, take a small amount and fill with appropriate warm boiled water, if the precipitate is melted, indicating that the pesticide can still be used.

5. Water method: This method is used to distinguish powder, wettable powder and emulsion pesticides. If it is a powder, you can use 50 grams of medicine to put it into a glass teacup, add appropriate cold water, stir to dissolve it, and let it stand for 30 minutes.

The wettable powder is easy to form lumps when it is stored, so you can grind the lumps into powder form first, and add a little cold water. If it melts quickly, it indicates that the pesticide is reasonable, and vice versa.

In addition, the pesticide sample can be lightly sprinkled on the water surface, and the reasonable pesticide can be sunk into the water for 1 minute; If the water surface is not wet for a long time, it is an ineffective or ineffective pesticide. If it is an emulsion, you can put a small amount into a glass teacup, fill it with a small amount of water to mix, and let it stand for 30 minutes. If there are no oil beads on the water surface and no sediment in the cup, it indicates that the pesticide is reasonable.

The first is to smell the smell, if there is no strong smell, it will be invalid, and the second is to look at the shape, if there is a melting, it will gradually fail.

It depends on whether the pesticide is clumpy, or whether it is granular. You can also take some pesticides and burn them with fire, if there is white smoke, it means that the pesticide has not failed. You can also see whether the pesticide is layered, if there is no layering, it means that the pesticide has not failed.

Soak the pesticide in warm water for an hour, if there is sediment. It means that the pesticide has failed. You can also add pesticides to the water, and if these pesticides float on it, it means that the pesticide has not failed.

The pesticide can be dissolved in water to observe the sediment, the pesticide can be heated to smell the smell, the appearance of the pesticide can be observed, and the certificate and validity period of the pesticide can be observed.

At this time, it can be judged by the taste, and it can also be judged according to the state of the pesticide, according to the production date, or according to the appearance of the agent, and then it can also be judged according to the way of the first to determine whether the pesticide is layered.

Objective factors such as temperature, environmental humidity, precipitation, sunlight exposure, wind, soil layer characteristics and other environmental factors immediately endanger the human physiological theme activities of the disease and the full play of pesticide performance, and the result is that the medicinal power of pesticides will be harmed.

The composition, physical and chemical properties, mechanism of action, application and use of pesticides and their production and processing characteristics are all harmful to the drug power simultaneously or indirectly.

If the granules are agglomerated by moisture in the whole process of storage, they must be placed in a cool and cool place to dry, and can be applied after grinding.

WP take 1 part of wettable powder, add 200 parts of water, put it in a glass teacup, stand still for a certain time after mixing, observe the floating condition, if the drug is deposition sluggish, it indicates that the floatability is excellent; In case of poor quality, add silicone material modifier or neutral fertilizer soap powder before application to improve moisture spreadability. If the wettable powder allows the rock to become damp and lumps, it is not suitable for sliding as a sprayer.

Transformation of the emulsifying properties of emulsified concentrates. Take 1 part of emulsifiable concentrate, add 200 parts of water, put it in a glass teacup, mix it and stand still for 30 minutes, observe the emulsification situation, if there is no oil bleaching on the top layer, there is no precipitation in the next layer, and there are no significant oil beads in the middle, indicating good emulsifying performance. If there is emulsifiable concentrate on the top and deposition below, and there is a hierarchical condition after 10 minutes, it means that the solvent is destroyed and cannot be applied;

Clumping status. If the emulsifiable concentrate has been in an imliquid, viscous liquid state or has formed a soapy solid, it is confirmed that most of the organic solvent has evaporated, and the quality has changed, so it cannot be applied; The condition of the sedimentary crystals is old. If the solvent is stored for a long time, milky white crystals will appear at the bottom of the bottle and precipitate or turbidity.

If the emulsifiable concentrate is soaked in boiling water at 30 40 degrees, the crystals can melt within 30 minutes and be repaired into a fully transparent liquid state, indicating that the quality is good and can be applied. If it cannot be melted, it means that the quality of the emulsifiable concentrate has changed and cannot be applied.