date:May 10, 2012
ed/marestail, giant ragweed and lambsquarters, Hartzler says.
When you do get out to knock down the weeds that escaped early preemerge applications, make sure the herbicide you're using will pack enough postemergence punch to get the job done. Most preemergence herbicides also are registered for application after corn has emerged, however, their activity on emerged weeds varies, Hartzler says. If weeds are present, determine whether the postemergence activity of the residual herbicides is suffi