Hello, I have a pouch left over that I purchased last year that was never opened. There is no expiration date on the pouch.
I also have a pouch that I purchased and opened last year. The unused powder remained in the pouch in a zip-lock bag. The only thing I could find is on the label, "Keep tightly closed. Store at cool temperature when possible and with minimum exposure to the atmosphere." I have kept the zip-lock tightly closed with minimum air inside. Storage temperature for both (open/unopened) packages varied from about 60 - 85 degrees F. I found this site: http://extension.missouri.edu/p/G1921 that has some general guidelines for wettable powders: "Moisture is the greatest factor affecting their storage, as it can cause caking that may reduce the effectiveness of the pesticide. " So that tells me as long as there is no caking both (open/unopened) should be still good. Is that true? Your wisdom is appreciated. Thanks, Rye Hefley So. Cal.
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