Corn Disease Calendar

Tom Allen, Extension Plant Pathologist
By Tom Allen, Extension Plant Pathologist April 20, 2013 14:45

Scouting for corn diseases is important regardless of the time of year.  Most foliar diseases occur at specific times of the year.  However, in some cases, diseases such as southern corn rust can occur earlier in the corn growing season depending on the environment encountered during the season.  For example, southern corn rust was observed in June during 2010 but not until late July during 2012.  In addition, foliar diseases such as gray leaf spot can occur earlier than normal if excessive corn stubble remains in the field over several successive seasons.  But, with that in mind, I have only seen GLS on vegetative stage corn in one particular, no-till field setting where GLS has been the predominant disease at that location.

The majority of the diseases contained in the provided calendar are of the foliar variety.  I chose to leave a few minor diseases off the calendar as I have only observed them in extremely limited situations (e.g., eyespot, diplodia leaf streak).  Some diseases, such as charcoal rot, anthracnose or some of the virus diseases encountered in our production system are likely the result of infection that could have occurred at earlier growth stages.  Note that some diseases can show up in more than one growth stage area but will ultimately depend on the environment encountered throughout the season and to a greater extent planting date.  But, in some cases, previous crop will also dictate the foliar disease pressure.  For example, corn following corn will likely have additional inoculum pressure for such diseases as gray leaf spot and northern corn leaf blight.  However, the inoculum to produce rust infection (common and southern) will have to blow into our production area from an overwintering source of inoculum.

Corn Disease Calendar

Print Friendly
Tom Allen, Extension Plant Pathologist
By Tom Allen, Extension Plant Pathologist April 20, 2013 14:45
Write a comment


View comments

Write a comment

Your e-mail address will not be published.
Required fields are marked*

Subscribe to receive updates

  • Soybean Harvest Aids

    Several calls have come in over the last week regarding soybean harvest aid options for various scenarios. In some cases, fields have been observed with varying degrees of maturity. In ...
  • Sugarcane Aphid Control with Falling Temperatures

    In 2014 we saw two incidents of less than satisfactory control with Transform on sugarcane aphids in grain sorghum across a broad geography. At the time we were mixing a ...
  • Pheromone Trap Counts, August 28. 2015

    Bollworm trap catches remained similar to last week, which is somewhat lower than average for this time of year. Tobacco budworm trap catches were somewhat higher this week. As most ...
  • Pheromone Trap Counts, August 21, 2015

    Bollworm moth trap catches were slightly higher in most counties this week but are generally lower than average counts for this time of year. Tobacco budworm moths continued to be ...
  • Defoliating Caterpillars in Peanuts

    We have had numerous calls over the last 2 weeks about caterpillars in peanut from all around the state. In every case, the calls have involved a complex of multiple species including bollworm/tobacco budworm, cutworms, armyworms, saltmarsh caterpillar, loopers, and rednecked peanut worm. ...
  • 3rd Annual Mississippi Sweetpotato Field Day Program- August 27th

    Mississippi State University will host its 3rd Annual Sweetpotato Field Day Thursday August 27 at the Pontotoc Ridge-Flatwoods Branch Experiment Station (8320 Hwy 15 S., Pontotoc, MS 38863).  Registration is ...

More Info By