What is the identification of the expiration date of pesticides?

For powder insecticides, it is necessary to look at their appearance, such as damp and agglomerate, the smell of medicine is not strong or has other peculiar smells, and can be kneaded into a ball by hand, indicating that it has basically failed; For emulsion pesticides, first invert the medicine bottle, if the liquid medicine is turbid or stratified, that is, the oil and water are separated, resulting in precipitate or flocculent suspension, indicating that the agent may have been invalid. Used in pesticide powder. 5 10 grams of insecticide, put on a metal sheet to heat, if there is a large amount of white smoke, and there is a strong pungent smell, it means that the agent is good, otherwise it means that it has been ineffective.

It is used as a wettable powder pesticide. <>

First put 200 grams of water into the container, then take 1 gram of pesticide, lightly sprinkle on the water surface, carefully observe, moist and soluble in water within 1 minute is the pesticide that has not expired, otherwise it is an invalid pesticide. It is used as a wettable powder pesticide. 30 50 grams of insecticide, put it in a glassware, add a small amount of water to make a paste, then add 150 200 grams of water and stir evenly, wait for 10 minutes to observe, the insecticide that has not expired has good solubility, fine powder, slow sedimentation rate, and less precipitation.

It is suitable for the use of pesticide suspension. Soak in 50 60 warm water for 1 hour, if the precipitate dissolves slowly, it means that the agent has not expired, indicating that the agent has become invalid. <>

It is necessary to avoid storing pesticides in an extremely high or low temperature environment, because high temperature can accelerate the decomposition of pesticides, and low temperatures, especially freezing, will cause changes in the physical properties of pesticides, such as: emulsifiable pesticide stratification, precipitation, powder suspension rate reduction, etc. Since there are many kinds of active ingredients that can be broken down by ultraviolet light in sunlight, its secondary light-shielding effect is secondary.

Therefore, it is best to store pesticides in a dedicated pesticide storage cabinet indoors. This protects you from high temperatures and direct sunlight in the summer and from low temperatures outdoors in the winter. In addition, after the package has been opened, the medicine should be sealed and stored after one use, whether it is bottled or bag, so as to avoid evaporation of the medicine or moisture absorption of the powder.

Personally, it is recommended to identify the expiration date of the pesticide to see whether the appearance of the pesticide is damp and agglomerate, the drug smell is not strong or has other peculiar smells, and can be kneaded into a ball by hand, indicating that it has basically failed, for emulsion pesticides, the first bottle is upside down, if the liquid is turbid or stratified that is, oil-water separation, there is precipitate generation or flocculent suspension, indicating that the agent may have been invalid.

If you are afraid that the pesticide will expire, you can look at the production date and shelf life outside the medicine bottle, and you can also sprinkle the pesticide on the water.

It can be identified by observation, or to understand the shelf life of pesticides, or to understand the efficacy of pesticides.

You can look at the composition of the pesticide, and secondly, you can also pour the pesticide on some grass to see if it has any effect.

You can take a look at whether the pesticide has no other abnormalities, or a normal phenomenon, so that you can judge whether the pesticide has expired, whether it is within the validity period, if it is a powdered pesticide, you can use it in water for an interview, so that you can know whether it can be used.

In fact, the expiration date of pesticides does not need to be identified, and the expiration date of pesticides is generally on the outside of the bottle or on the outer packaging, as long as you pay attention to it.

If you want to identify the expiration date of a pesticide, you can check the production date and shelf life of the pesticide packaging, as this is the most accurate method.

Pay attention to the expiration date on the cover, which is already clearly marked, so be sure to refer to it.

Since it is the identification of invalid pesticides, the subject must know the name of the pesticide, but he does not know the quality and effect of the pesticide. In actual production and life, Qingjiang Crane uses the following methods to quickly identify whether pesticides are ineffective or deteriorated. It can be used for your reference.

First, the appearance of visual inspection: first look at whether the production date of the pesticide is valid (note: expired pesticides are not necessarily invalid). The degree of deterioration or ineffectiveness of pesticides varies with the length of expiration time.

Secondly, from the appearance, whether the pesticide has the phenomenon of oil-water separation, precipitation and discoloration (emulsion pesticides), whether there is damp agglomeration (powder pesticides), and whether there is discoloration and precipitation crystallization and precipitation (water pesticides; Whether there is a resurgence of deliquescent (tablet pesticides) and whether there is a solidification phenomenon (suspension pesticides). Every type of pesticide has its failure to deteriorate"tags", all of which have the inherent characteristics of failure and deterioration, which are not possessed by other types of pesticides. We need to use these inherent characteristics or labels to identify whether pesticides have failed or deteriorated.

Second, warm water heating method: mainly emulsion pesticides. Unopened the pesticide in warm water at about 40 degrees, and observe whether the sediment in the pesticide bottle disappears after one hour.

If the sediment does not disappear, it means that the pesticide has deteriorated and failed, and the more sediment, the more deterioration or ineffectiveness.

Second, the iron plate burning method: mainly powder pesticides. Put the powder pesticide on the iron plate and burn it under the iron plate to see if the pesticide emits white smoke. If there is no white smoke, it means that the pesticide has become ineffective or deteriorated. The more white smoke there is, the less ineffective or deteriorating the pesticide is.

Third, the water dissolution method: drop the emulsifiable concentrate into the water, 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.

Fourth, water precipitation method: put the powder pesticide into a glass container, add an appropriate amount of water to stir into a paste, then add water and stir evenly and let stand for ten minutes. Soluble with undiminished efficacy, the WP solution is turbid, the powder particles are fine and the precipitation is slow and rare.

Deterioration or effective powder pesticides, precipitation is more and faster, the solution is turbid, and the supernatant and bottom sink appear.

Fifth, the chemical agent verification method: it is rarely used in production and life. Not only is there no professional equipment, but there are also no professional reagents.

The analytical methods are also complex, and it is not possible to do it without professional knowledge. However, some simple chemical verification is still possible. I won't go into detail here.

You can go to a professional drug testing institute for analysis and testing, but you have to pay a certain fee.

At this time, you can judge according to the production number outside the pesticide, and then you can also judge according to the taste of the pesticide, and then you can also judge whether the pesticide has lumps, and you can also add some to the water.

Powder or wettable powder, from the appearance, such as damp into a lump, no gas, etc., the pesticide will basically fail, **method, the available force ** after standing for 1 hour, if there is sediment at the bottom and the oil and water stratification is obvious, it proves that the pesticide has deteriorated and so on.

For powder pesticides, first look at the appearance of the agent, if it is damp and agglomerate, the smell of the medicine is not strong or there are other peculiar smells, and can be kneaded into a ball by hand, it means that it has basically failed; For emulsion pesticides, first turn the medicine bottle upside down, if the liquid is turbid or stratified (i.e., oil-water separation), there is precipitation generation or flocculent suspension, indicating that the agent may have failed.

Heating method: suitable for powder pesticides. Take 5-10 grams of pesticides, put them on a metal sheet and heat, if a large amount of white smoke is produced, and there is a strong pungent smell, it means that the agent is good, otherwise, it indicates that it has been invalid.

Floating method: suitable for wettable powder pesticides. First take 200 grams of water and put it in the container, then take 1 gram of pesticide, gently and evenly sprinkle it on the water surface, carefully observe, moisten and dissolve in water within 1 minute for the non-invalid pesticide, otherwise it is an invalid pesticide.

The best way is to identify by the label of the pesticide, the manufacturer of the pesticide, the state of the pesticide, the color of the pesticide, and the consistency of the pesticide.

Identification can be carried out using specific principles, either by selective observation, by heating, by dissolving, or by suspension.

First of all, you should observe the color of the pesticide, you also need to smell the smell of the pesticide, or you can directly look at the ingredient list of the pesticide packaging, and then you can see the effect of the use of the pesticide, and you can also judge by the viscosity of the pesticide, and you can also dissolve it by heating.

The shelf life of pesticide products is generally two years, and there are also 5 years, and the PD certificate is 5 years, and the LS temporary is one year.

To identify pesticides, we should first pay attention to the following aspects:

1) Check whether the outer packaging, inner packaging, label content, production date, batch number, etc. are complete.

2) Identification in appearance and morphology, qualified pesticides have the following characteristics:

Emulsifiable pesticide: generally light yellow or dark brown transparent liquid, first observe whether there is delamination, if there is delamination, the emulsion formed after dilution with water will not be stable.

WP pesticides: do not clump into clumps, and form a good suspension after dilution with water.

Suspension: a viscous, flowing liquid, which is allowed to stratify after storage, but can still return to its original state when shaken by hand, and is not allowed to coalesce into lumps.

Granules: uniform particle size and color, no dust, dry and loose.

There are a lot of expired pesticides in farmers' homes, some of which have become invalid, and some of which have expired, but still have medicinal effects, how to identify them?

It's clear, it's clear. Thank you.

It mainly depends on what kind of pesticide it is, and the pesticide is mainly the ingredient content that meets the requirements of the label during the validity period. There will be a decrease in the content of expired pesticide ingredients.

After passing the inspection, many expired pesticides still have a certain use value. Article 23 of China's "Pesticide Management Regulations" stipulates that "pesticide products that exceed the product quality assurance period shall be sold within the specified period if they meet the standards and meet the standards; However, the words 'expired pesticides' must be indicated, along with the method of use and dosage. "Expired pesticides that do not meet the standards after inspection should be disposed of in accordance with the law.

The expiration date of pesticides is the basic period for drugs to ensure the prevention and control effect. That is, the period of product quality assurance. Indicated by an expiration date or expiration date. Generally, insecticides have a validity period of 2 years, fungicides for 2 or 3 years, and not more than 3 years.

If you want to continue to sell expired pesticides, you must first report to the pesticide testing agency under the people's ** agricultural administrative departments at or above the provincial level, and if you meet the standards, you can sell them within the specified period; However, the words 'expired pesticides' must be indicated, along with the method of use and dosage. Inspected by the pesticide testing agency under the people's agricultural administrative departments at or above the provincial level, expired pesticides that meet the standards can be used in accordance with the approved period and use methods.