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by Mandy Bish.
Tar spot in corn sounded like a distant issue to corn producers in Kansas just a handful of
years ago. Today, the disease has spread quickly, doubling in counties in the state each year
and causing severe yield loss in susceptible hybrids.
During the Kansas Corn and Soybean School in Parsons, Kansas State University Extension
specialist Rodrigo Onofre discussed the impacts tar spot has had in the state thus far, as well
as its future trajectory. “Three years ago, if you asked me about tar spot, I would say this is
going to be a northern problem, Wisconsin, Minnesota, or Indiana,” Onofre said. “I wasn’t
really quite sure how it would look like here in Kansas. And this year, we got hit really
hard on that northeast part of the state.”
Especially in fields monitored in Doniphan County, Onofre said the rate at which the disease
infected and began a noticeable decline the quality of the crop occurred with incredible speed.
“One of the things that we saw with tar spot in Doniphan was the first time that we saw it
there was at V8. And we sprayed at V14 a couple days or maybe a week later,” Onofre
said. “I was impressed to see how tar spot progressed so quickly in that part of the state.”
Tar spot requires many hosts in order to create many infected plants. The disease follows a
similar pattern to rust, which can also go through multiple cycles in just one growing season.
“Tar spot is a disease caused by fungi, so fungicides do work for tar spot management,”
Onofre said.
Multiple applications of fungicide, as well as tillage can be effective tools against the disease,
especially to help prevent problems year over year. Management early is a key to keeping the
damage contained. “The earliest we have seen tar spot in Kansas was at V8, but it has been
seen as early as V3,” Onofre said. “One of the biggest differences from Kansas and all the
other states is that we are seeing tar spot a lot earlier here than we are in Indiana, Wisconsin
and several other states.”
While the problem of excess water is not one Southeast Kansas farmers have faced in a few
years, it is one that historically can impact early spring corn. Excess water is the key
ingredient for strong and spreading tar spot concerns. “Tar spot likes water,” Onofre said. “If
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Tar spot in corn sounded like a distant issue to corn producers in Kansas just a handful of
years ago. Today, the disease has spread quickly, doubling in counties in the state each year
and causing severe yield loss in susceptible hybrids.
During the Kansas Corn and Soybean School in Parsons, Kansas State University Extension
specialist Rodrigo Onofre discussed the impacts tar spot has had in the state thus far, as well
as its future trajectory. “Three years ago, if you asked me about tar spot, I would say this is
going to be a northern problem, Wisconsin, Minnesota, or Indiana,” Onofre said. “I wasn’t
really quite sure how it would look like here in Kansas. And this year, we got hit really
hard on that northeast part of the state.”
Especially in fields monitored in Doniphan County, Onofre said the rate at which the disease
infected and began a noticeable decline the quality of the crop occurred with incredible speed.
“One of the things that we saw with tar spot in Doniphan was the first time that we saw it
there was at V8. And we sprayed at V14 a couple days or maybe a week later,” Onofre
said. “I was impressed to see how tar spot progressed so quickly in that part of the state.”
Tar spot requires many hosts in order to create many infected plants. The disease follows a
similar pattern to rust, which can also go through multiple cycles in just one growing season.
“Tar spot is a disease caused by fungi, so fungicides do work for tar spot management,”
Onofre said.
Multiple applications of fungicide, as well as tillage can be effective tools against the disease,
especially to help prevent problems year over year. Management early is a key to keeping the
damage contained. “The earliest we have seen tar spot in Kansas was at V8, but it has been
seen as early as V3,” Onofre said. “One of the biggest differences from Kansas and all the
other states is that we are seeing tar spot a lot earlier here than we are in Indiana, Wisconsin
and several other states.”
While the problem of excess water is not one Southeast Kansas farmers have faced in a few
years, it is one that historically can impact early spring corn. Excess water is the key
ingredient for strong and spreading tar spot concerns. “Tar spot likes water,” Onofre said. “If
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