Dry powders such as pesticides such as the appearance of wet state, when the hand can be wet mass, semi-failure pesticides; if formed into a soft block, then all failure. Normal dry powder pesticides should have no moisture absorption and agglomeration.

The WP class takes a few pesticides and pours it into a container. Add an appropriate amount of water to make it into a paste. Then add a small amount of fresh water and stir it. After standing, observe if it is a pesticide that has not been degraded, its suspensibility is better. The sedimentation rate of the pellets is slower and the precipitates are also particularly low. Conversely, pesticides with varying degrees of failure or deterioration should be used with caution.

Emulsions in the identification of such pesticides, the bottle can be shaken and then set aside for about 1 hour to observe, if there is a stratification phenomenon, it indicates that the pesticide has failed. In addition, the medicine bottle can also be placed in warm water, and observed after absorbing heat. If it is a non-deteriorating pesticide, the sediment in the bottle will slowly dissolve or even completely disappear. On the contrary, it is a failure pesticide.

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