In agricultural production, if the failed pesticides are misused, there is no control effect, and the crops may be damaged and the production may be reduced or even lost. The following describes the identification methods of several failed pesticides to readers.
Dry powders Such pesticides, if they are in a damp state, can form a wet mass when held by hands, and are semi-failed pesticides; if they are formed into soft blocks, all of them will be ineffective. Normal dry powder pesticides should be free of moisture and agglomeration.
For the wettable powder, take a little pesticide and pour it into the container. Add a proper amount of water to make it into a paste. Then add a small amount of water and mix well. After standing, observe. In the case of an undeteriorated pesticide, the suspension property is good, the precipitation rate of the powder particles is slow, and the precipitate is particularly small. On the contrary, pesticides with different degrees of failure or deterioration should be used with caution.
In the identification of such pesticides, the emulsion can be shaken vigorously and left to stand for about 1 hour before observation. If stratification occurs, the pesticide has expired. In addition, the medicine bottle can be placed in warm water, and it is observed after the heat absorption. If it is an undeteriorated pesticide, the precipitate in the bottle will slowly dissolve or even disappear completely; otherwise, it is a failed pesticide.
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