Pro Farmer Editors
Iowa State University plant pathologist Alison Robertson says ear and
stalk rots will likely become prevalent in Iowa as the growing season draws
to a close. In the past week, she said there have been a few reports of Diplodia
ear rot from the northeast, central and southeastern parts of the state. This
ear rot is not as common as Fusarium or Gibberella ear rot in Iowa.
"Diplodia ear rot is favored by cool, wet weather during grain fill.
Infection occurs through the silks and/or ear shank, or via the base of the
husks of the ear," says Robertson.
this link for additional information on ear rots.
Robertson says although Diplodia ear rot does not appear to produce
mycotoxins in the grain under typical Iowa field conditions, infected kernels
are lightweight and have reduced nutritional value. "Damage caused by Diplodia
ear rot is usually limited to the field, but the pathogen can be a problem in
storage if grain moisture is 20 percent or above," she adds.