Insecticidal ear tags

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ga. prime

Well-known member
Aug 30, 2004
Reaction score
So. Cent. Ga.
Back on May 4th I put Python Magnum ear tags on all my cows. They did an excellent job. But now the flies are back big time. Should I re-tag with the Magnum Python tags or use one with a different active ingredient?
We switch on a calendar year basis. If I have to reapply tags, I reapply the same type that year. Seems to work great for us. Just take the tags out when the flies are gone in the fall. I have heard that a weak tag builds fly tolerance to that type of chemical.

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