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Title: emits odor, but doesn't attract
Review: Had purchased the trap in 2010 at hardware store. Looking for the refill cartridge, found it with good price on Amazon and purchased last year. Noticed that this product emits a strong odor, so felt that it was fresh enough. BUT didn't attract any yellow jackets. Reread the hints on the insert paper from the original trap and decided to try a half slice of deli ham. The ham immediately attracted and the yellow jackets were trapped. Tried again this year with the same results.
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