First, the identification method of emulsion pesticides.
1. Observation method. If there is sedimentation or stratification and flocculation in the pesticide, the bottle can be placed in hot water and allowed to stand for one hour. If the precipitate or floc disappears, the pesticide is effective, otherwise it can no longer be used.
2. Oscillation method. In the pesticide bottle, the stratification of the lower layer of the upper layer of emulsifiable concentrate appears. The bottle can be shaken and allowed to stand for one hour. If there is stratification, the deterioration of the pesticide is proved to be invalid. If the delamination disappears, it can be used continuously.
Second, the powder pesticide identification method.
1. Suspension method. Take 50 grams of powder pesticide, put it in a glass bottle, add a little water to make a paste, then add an appropriate amount of water and mix well, place for 10-20 minutes, good pesticide powder is fine and less, and the precipitation is slow, the pesticide powder is invalid. More particles and faster precipitation.
2, cauterization method. Take 5 - 10 grams of powder pesticide, put it on a metal sheet, and heat it on a fire. If it emits white smoke and has a strong pungent odor, it is an effective pesticide. Otherwise, the pesticide has failed.
3. Observation method. If the powder pesticide has been agglomerated, it is not easy to break, indicating that the pesticide has failed and can no longer be used.
Third, the wettable powder pesticide identification method. Take a cup of water and gently spread a little pesticide on the water. If the pesticide does not dissolve in the water, the pesticide has deteriorated.
Take 1 gram of pesticide into a cup of water and mix well. If precipitation occurs quickly, the liquid surface will appear translucent, indicating that the pesticide has failed.
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