Expired pesticides can still be used, but must meet a prerequisite!

The special nature of pesticides makes them extremely careful in the use and handling. How do the expired pesticides be treated? Can the expired pesticides in the pesticide store operate? Is the “expired” pesticide equivalent to “deterioration, failure” pesticides? Can pesticides be used in the end? Let's talk to you today.

Can expired pesticides be sold? Absolutely not allowed

Expired pesticides are inferior pesticides, and expired pesticides in pesticide factories are best returned to pesticide manufacturers. According to the Regulations on the Administration of Pesticides: “Pesticide that exceeds the quality assurance period of pesticides shall be disposed of inferior pesticides. If it is fine, it shall be fined, and criminal responsibility shall be pursued.” Because many expired pesticides have reduced control effects and are sold to farmers, it is suitable. The dosage of the use is difficult to estimate. If the metering is added or mixed with other pesticides, it is easy to produce phytotoxicity; the pesticides of the expired pesticides are highly toxic and polluting, and cannot be easily destroyed, and returned to the pesticide production enterprise for unified treatment.

Can expired pesticides be used? The key is to see whether it is "ineffective or deteriorated"

Farmers' friends often turn over pesticides that have not been used up before, and are ready to continue to use them. If they are found to be out of date, they are considered to be “deteriorated and ineffective” and cannot be used. However, the shelf life of pesticides is determined according to the expected control effect of plant pests and diseases under normal doses. Many expired pesticides, as long as the dosage is properly adjusted, strictly in accordance with scientific methods, still have good insecticidal and disease-preventing effects.

Therefore, “expired” pesticides “deterioration, failure” pesticides, as long as there is no “failure, deterioration”, can continue to use. How to judge whether the expired pesticides have deteriorated, Xiaobian combines several common pesticide preparations, and share the method of distinguishing whether the pesticides have deteriorated as a simple reference.

1, wettable powder

Take 1 part of wettable powder, add 200 parts of water, hold in a glass cup, shake it for a certain period of time, observe the suspension. If the drug precipitates slowly, the suspension is good. In case of poor quality, silicone additives or 0.10% neutral detergent should be added before use to increase the wetness and spreadability. If the wettable powder absorbs moisture and is hard, it should not be used as a spray.

2, powder

If the powder absorbs moisture and agglomerates during storage, it needs to be placed in a cool and ventilated place to dry, not to be exposed to the sun or crushed. If the agglomeration is serious, it can only be used for toxic soil.

3, emulsifiable

In the process of storage of emulsion pesticides, if the storage is not good, the following three conditions may occur: agglomeration, if the emulsified oil has a non-flowing viscous liquid or has formed a soapy solid, it proves that the solvent has been mostly volatilized, and the quality has been There are changes that cannot be used. Precipitation crystallization phenomenon, long-term storage of the emulsion, the bottom of the bottle will have white crystals or turbidity. If the emulsified milk bottle is immersed in warm water of 30-40, the crystallization will melt in about 30 minutes and return to a transparent liquid, indicating that the quality is still good and can be used. If it does not dissolve, it indicates that the quality of the cream has changed and cannot be used. Change the emulsifying properties of the emulsifiable concentrate, take 1 part of the emulsifiable concentrate, add 200 parts of water, put it in a glass cup, shake it and then stand still for about half an hour, observe the emulsification. If there is no oil slick in the upper layer, there is no sediment in the lower layer, no obvious oil beads in the middle, indicating Emulsifying performance is good; if there is emulsifiable concentrate, there is sedimentation, and there is delamination after 10 minutes, indicating that the emulsion is destroyed and cannot be used.

"Expired" pesticides continue to be used, pay attention to the following operations

After the expiration date has passed, it is necessary to adjust the dosage according to the efficacy of the drug. Because some biological pesticides have reduced biological activity after expiration, the efficacy is weakened; while some chemical components become high after the pesticide expires, the toxicity is enhanced. Therefore, when using outdated pesticides, the initial use amount must be sprayed according to the instructional dosage. After 3-5 days after use, the results of killing pests and diseases are checked. If the effect is not very satisfactory, the dosage can be basically increased in the original. After the second spray, the result is still not obvious, you need to change the pesticide or use the pesticide alternately; if the effect is significant after use, you can continue to use it.

It is necessary to grasp the dosage according to the stage of crop development. Especially in the seedling stage of the crop, the leaf area is small, and the dosage should be reduced accordingly, but the pesticide should still be blended according to the proportion of the guidance. At other stages, an appropriate amount of expired pesticides can be added.

Obsolete pesticides are not all “failed, degraded” pesticides, but pesticides that may not achieve the expected results according to the original dosage. After proper adjustment of dosage, many expired pesticides can still be used, and it is not recommended to destroy all expired pesticides.