How to identify whether a pesticide has failed
(1) Intuitive method: If the appearance is obviously damp, the powder becomes united, the taste of the medicine is not strong or there is other mildew and acid odor; or the hand is pinched with heavy moisture, and the force is pinched into a group, indicating that the medicine is basically ineffective.
(2) Dissolution method: Take 30 grams of wettable powder pesticide, put it into a glass container, first add a small amount of water to make a paste, then add 150 grams of water to stir evenly, and let stand for observation. The undegraded pesticide has good solubility, the number of suspended powder is small, and the sedimentation rate is slow; on the contrary, if the precipitation is fast, the powder is large and agglomerates, indicating that the pesticide has deteriorated.
Identification of emulsion (oil) pesticides:
(1) Intuitive method: bottled emulsion (oil agent) pesticide. After standing, if the turbidity is unclear or the oil is in the water layer, there is sedimentation and suspension flocculation, indicating that the agent has failed.
(2) Hot-dissolving method: Put the pre-precipitated bottled pesticide into the wet water, and after warming for 1 hour, if the precipitate dissolves slowly, it means that the pesticide has not deteriorated; if the precipitate is difficult to dissolve or insolubilize, it means Basic failure or complete failure. The medicinal bottle with layered pesticides is shaken vigorously and allowed to stand for 1 hour. If it is no longer layered, it can still be used; if there is more obvious stratification, it cannot be used.
(3) Dilution method: take 1 gram of emulsifiable pesticide, add 100 grams of water, stir well and let stand for 1 hour. If there is no emulsifiable oil on the surface, there is no sediment at the bottom, and the dilution is uniform milky white, indicating good medicinal properties, such as sediment at the bottom, water The oil is layered, indicating that the drug has failed.
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