Goss’s Wilt of corn is caused by the bacterium Clavibacter michiganensis subsp. nebraskensis, and has been present in Manitoba since it was originally identified near Roland in 2009.
In 2014, 74 corn fields were surveyed across the major grain corn growing areas of the province. The disease was detected in 14% of the fields randomly surveyed. Goss’s Wilt was detected in the rural municipalities (RM) of Roland, Thompson, Dufferin, Montcalm, Morris and Portage la Prairie. In addition, the disease was observed in the RM’s of Stanley and Rhineland, although not in the fields that were part of the survey. In past years, Goss’s Wilt has also been detected in the RM of Hanover.
Figure 1: Goss’s Wilt provincial survey results where red crosses indicate fields where disease was found and green dots indicate fields where disease was not detected.
Results indicate that Goss’s Wilt has spread to most of the grain corn growing areas of Manitoba, and therefore, is something that must be scouted for and managed by all growers.
For more information on disease symptoms of Goss’s Wilt, life cycle of the disease, management options and complete methodology and results of the 2014 survey, please view the attached poster which was presented at the 2014 Manitoba Agronomists Conference:
Goss’s Wilt in Corn: 2014 Manitoba Disease Survey (Holly Derksen, MAFRD & Morgan Cott, MCGA)
Submitted by: Holly Derksen, Field Crops Pathologist, MAFRD