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| The recommendation is to not let them get past 4" or risk yield loss on weeds emerging after the crop. Similarly, simazine doesn't have great activity of Giant rags anyway.
Get them before the get past 8" in any case. You'll have to evaluate how thick they are to decide how much competition they might have. I had a plot sprayed when soybeans were just in true leaf because the rags had them covered over in spots.
In RRC, if you are using a Roundup Brand (Original Max or Weather Max) a second post application would be eligible for assistance in Indiana. The level of assistance is dictated by the formulation. E-mail me and I'll e-mail you a cheat sheet on the program.
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TO SPRAY OR WAIT
