First, see the date of production when purchasing pesticides. Purchase pesticides must go to regular agricultural units. When purchasing, first of all to see the pesticide species to be purchased, and then to see the pesticide production date and product specifications, because pesticides have shelf life, such as pesticides found beyond the shelf life do not buy, close to the shelf life of pesticides We must try our best to buy as much as we can. Second, the remaining pesticides in your home should not be used after they have passed the shelf life or have no conclusive evidence to prove their effectiveness. If there are remaining pesticides in the farmer's home last year, before using it this year, it is first necessary to see whether the label is in good condition. If it is still within the shelf life, if it is found that the pesticide has exceeded the shelf life, it is best advised not to use it. When the remaining pesticides are detached from the label and cannot be identified, they must not be used indiscriminately so as not to cause phytotoxicity to the crops and cause greater economic losses. Third, the remaining pesticides are carefully kept. Improper storage of the remaining pesticides will reduce the insecticidal effect and even produce phytotoxicity. Therefore, the pesticides purchased by farmers in the current year have not been used up yet, and they are ready to be used again in the next year. The following points should be made in the storage process: 1, sealed and stored. Some pesticides are volatile and cause air pollution. The bottle caps must be tightly tightened during storage and sealed. 2, keep the temperature. Most powdered pesticides are susceptible to quality at high temperatures. The higher the temperature, the more easily the pesticide melts, decomposes, volatilizes, and even burns and explodes. Some emulsion pesticides can also destroy their emulsifying properties and reduce their efficacy after they encounter high temperatures. Some bottles of liquid pesticides freeze when they encounter low temperatures, forming a block, or the bottle burst, in the preservation of such pesticides should maintain the room temperature above 1 °C. 3, avoid light. Some pesticides are afraid of light, long-term exposure to light exposure, will cause decomposition and deterioration of pesticides, in the storage to avoid high temperatures and sunlight. Keep dry. Powder pesticides and plant regulators, it is easy to absorb moisture and agglomerate. Therefore, the place where custody and storage of pesticides should be kept dry to prevent rain and snow. Also have windows to allow ventilation, keeping the relative humidity below 75%. 5, to avoid mixing. Pesticides are classified as alkaline, acidic and neutral. Alkaline pesticides include propanil, lime sulfur, Bordeaux mixture, etc. Acidic pesticides include deltamethrin, etc. Neutral pesticides include konjac powder. These three kinds of pesticides of different nature should be stored separately during storage and storage, and the distance should be maintained at 0.5 meters or more. Otherwise, the deterioration of pesticides will be lost. 6, rigorous mixing. For two kinds of pesticides that are not finished in the same year, they cannot be mixed in one bottle to avoid failure. Fourth, the remaining pesticides are labeled well. The remaining pesticides stored by farmers must have complete bottle stickers, and the names of agricultural drugs, batch numbers, production date and shelf life should be clear. If the bottle is damaged, the peasant household must write the shelf life and precautions for use of the pesticide and stick it on the outer package of the pesticide.
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Each pesticide has a certain shelf life, and it can be used safely and effectively when used within its shelf life. Once crops have been used for pesticides that exceed their shelf life, they will not only have the effect of eliminating diseases and pests, but will also make the pests resistant to insecticides, delaying the best time for controlling pests and diseases, and making it difficult or impossible to prevent and control diseases. It is even more important. It is the phytotoxicity of crops that causes irreparable consequences. Therefore, farmers' friends must prohibit the use of expired pesticides. So, how to avoid using expired pesticides?