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First, the identification method of emulsion pesticides.
1, observation method. If there is precipitation or layered flocculation in the pesticide, the bottle can be placed in hot water and allowed to stand for one hour. If the precipitate or floe disappears, the pesticide is effective, otherwise it can not be used.
2, shock law. In the pesticide bottle, there was stratification of the sedimentation of the upper layer of the emulsifiable concentrate, and the bottle was shaken with force and allowed to stand for one hour. If there was stratification, the deterioration of the pesticide was proved to be invalid, and if the layering disappeared, it could continue to be used.
Second, powder pesticide identification method.
1, suspension method. Take 50 grams of powder pesticide, and put it in a glass bottle, add a little water to make a paste, add appropriate amount of fresh water and mix evenly, place it for 10-20 minutes, good pesticide powder is fine and less, and the sediment is slow, pesticide powder failure More grain and faster precipitation.
2, burning method. Take powder pesticide 5 - 10 grams, placed on a metal sheet, and placed on the fire heating, if the white smoke and a more intense pungent odor, is an effective pesticide, and pesticides have failed.
3, observation method. If the powdered pesticide is agglomerated, it is not easily broken, indicating that the pesticide has failed and can no longer be used.
Third, wettable powder pesticide identification method. Take a cup of clear water and sprinkle a little pesticide on the water. If the pesticide cannot dissolve in the water, the pesticide has deteriorated.
Take 1 gram of pesticide in a glass of water and mix it thoroughly. If precipitation occurs soon, the translucent surface appears, indicating that the pesticide has failed.
When farmers use or buy pesticides, whether the pesticides are ineffective can be identified from the following methods.