As the 2015 southern corn crop reaches the final stages, reports of increased disease incidence continue to surface in some areas of the Mid-South.
Southern rust has been reported in 19 counties in Mississippi, and some have been advocating spraying for the disease to reduce yield losses. Northern corn leaf blight has also been reported in some fields.
Tom Allen, Extension plant pathologist with Mississippi State University, has been responding to calls about the Southern rust and has scouted fields in three counties – Grenada, Leflore and Tallahatchie.
“In Grenada and Tallahatchie Counties I was able to find less than 10 pustules on a single leaf in a single field in each county,” said Dr. Allen. “I spent almost an hour looking in Tallahatchie County and left the field after finding two open pustules and four pustules that were not open. In all three counties, corn was beyond dent with the starch line beginning to move.
“Corn that has reached dent with an observable starch line will likely outrun damage as a result of southern rust,” noted Dr. Allen, who is based at the Delta Research and Extension Center at Stoneville, Miss.
To read more about Dr. Allen’s observations on disease symptoms in the 2015 corn crop, go to http://www.mississippi-crops.com/2015/07/11/corn-disease-update-july-11-2015/.