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King City, Mo | Rotating flexstar and cobra (and or ultra blazer) is not rotating because there in the same chemical group and sub group of Diphenylethers.
http://www.ksre.ksu.edu/bookstore/pubs/c715.pdf
If you really wanna rotate go to prowl or treflan to get a different mode of action.
Some dual and metributizon also works pre and if there is carry over to corn there is no worry. Corn can have both of those applied pre to them.
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Cobra on Giant Ragweed
