All posts by Larry Steckel, Extension Weed Specialist

Management of Large Palmer amaranth In Corn Approaching the Atrazine Cut-Off

Judging by our research here as well as phone calls from folks walking corn fields it is very apparent that pretty much any PRE applied herbicide in corn has given out. Even some of the PRE applied herbicides that traditionally have provided consistently long weed control like Lexar or Bicep have clearly given out about 25 days after application.  In other instances, I have had folks report that no PRE was applied to the corn and Palmer amaranth is good size.

Everyone is well behind with respect to spraying.  Way too many windy days and now a very wet Wednesday will keep sprayers out of the field until next week.  With that in mind there will be many fields of corn where both the corn and the Palmer amaranth will be large at time of spraying.  What are some good management strategies for this situation? Continue reading