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disease supression

Sep 28 2011

Cover Crop Cereal Rye: Is there a (bad) connection with Goss’s Wilt in corn?

Goss's Wilt is becoming quite a problem in the US Corn Belt.

Cover crop cereal rye has been getting some “bad press” over the past month. It has been suggested that there is a connection with cover crop rye and Goss’s Wilt in corn (cereal rye making the Goss’s Wilt disease worse in corn).

I have talked to a few agronomists who had never heard of cover crop rye being a host for Goss’s Wilt, so I did my normal Google search to see what I could find out.

Some corn hybrids ARE susceptible to Goss’s Wilt. Some have greater levels of resistance.  Here is a publication from The University of Nebraska that shows the severity of Goss’s Wilt.  This disease is a real problem in the Corn Belt and there are many frustrated farmers that have Goss’s Wilt on their corn.

I also discovered that cereal rye is more of a deterrent to Goss’s Wilt, rather than a “cause.”  By using cereal grains in between corn crops the Goss’s Wilt bacterium population is greatly reduced.  Cereal rye is actually an excellent choice for a cover crop to help reduce the risk of Goss’s Wilt.

To reduce Goss’s Wilt it would be wise to consider the following steps:

  • use resistant corn hybrids
  • use a cover crop between continuous corn crops
  • control foxtail, barnyardgrass, shattercane, and other known hosts
  • rotate to soybeans, dry beans, alfalfa, small grains, or other non-host crops

For an excellent article on this topic by Sarah Carlson at Practical Farmers of Iowa, click here. You can reach Sarah at sarah@practicalfarmers.org

 

 

 

 

Written by Dave Robison · Categorized: Corn, Cover Crop Benefits, Misinformation and Myths, Winter Cereal Rye · Tagged: cereal rye, corn, cover crops, disease supression, Goss's Wilt, Winter Cereal Rye

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