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Replanting corn? You're not too late

Jeff Caldwell 05/16/2011 @ 2:41pm Multimedia Editor for Agriculture.com and Successful Farming magazine.

Though the weather's made planting corn a little easier in parts of the country over the last couple of weeks, there are still plenty of acres out there that will need replanted. But before you start running again, take the right steps to knock down that previously planted corn so you wind up with a good, consistent stand.

You're not too late to replant corn, say University of Nebraska Extension crop specialists Greg Kruger and Lowell Sandell in a recent report. Just make sure you get a good kill of the earlier-planted corn plants. Failing to do so could make for uneven, yield-robbing stands.

"Cultivation can be effective, but it has to be done when soil and weather conditions are right. Also, depending on the cultivation method, complete control of the existing stand may not happen. Until about the V5 growth stage, the growing point of the corn plant is still below ground, making it more difficult to control the plant with some types of cultivation," Kruger and Sandell say. "[Chemical control], while effective in many cases, is not bulletproof. Once you decide to destroy a poor corn stand, the existing crop becomes a volunteer corn problem."

If you choose the latter, you have a few options. Look at your corn hybrids and traits first, then let that help you nail down which type you choose. Glyphosate, for example, will "provide excellent control of poor conventional or Liberty Link corn stands," Kruger and Sandell say, but if your corn has only the Roundup Ready trait, you have 3 main options:

  • Glufosinate (Ignite)
  • Paraquat (Gramoxone)
  • Clethodim (Select Max, which "has a supplemental label allowing the replanting of corn six days after application," the specialists says)

"Other ACCase herbicides, such as Assure II, Fusilade DX, or Fusion, will control an existing corn stand, however the labeled replant interval is too long for these to be considered viable options at this point," Kruger and Sandell say. "If the corn is stacked with Roundup Ready and Liberty Link traits, consider Gramoxone or Select Max.

"ACCase inhibitors are often slow acting, but generally provide good, consistent control of the corn stand. If replanting corn in the field, these herbicides have plant-back restrictions so consult the label before applying these herbicides," they add.

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