East-Central and Southeast Iowa Crop Information

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The growing point on corn is below ground until V6, when 6 leaves are fully emerged from the corn whorl , or about 8 leaves are visible. Prior to this time corn will generally regrow from hail damage. If the growing point is above ground, the growing point may still be alive. Make a horizontal cut through the corn and look for healthy white plant tissue in the center. Sometimes even though the growing point was not cut off, diseases set in after the hail and cause it to rot. Generally, some regrowth from the growing point can be seen 3-4 days after the hail. If no regrowth is seen, cut the plant and see if the growing point is rotting. Take stand counts as in soybeans and determine whether replanting is desirable based on the information below and the cost of replanting. Remember, the numbers in Table 1 assume a uniform stand.

Replanting to soybeans may be a better option after June 10-15, if the herbicides used will allow it. Corn herbicides that allow for replanting soybeans include: Dual II Magnum, Lasso, Micro Tech, Frontier, Axiom, Python, Prowl, Broadstrike + Dual, Pursuit, Basagran, Liberty, Accent (15 days), and Aim (30 days).

Do not replant soybeans if Atrazine has been applied or if fewer than 30 days have elapsed per pint of Banvel (or Clarity) since application.

Prepared by Jim Fawcett and Virgil Schmitt, ISU Extension Field Specialists - Crops, 6/2001.

If you have any questions, please feel free to contact the Iowa State University Extension Office.

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