At least a week. Might be more like 2. If it rains between spraying and planting is a plus.Can you plant brassica shortly after spraying 2,4 D or is their a wait period?
Good call. You still have time to go back and apply 24D if you need to. But no matter how much you use there is residual in 24D. You still have a lot of time here to get brassicas in.Someone is doing the spraying for me, and I just decided to go with roundup only and no 2,4 D.