Goss's Wilt is showing up in Manitoba and Alberta. What can you do to stop the disease on your farm? Goss’s Wilt is a bacterial disease in corn, caused by the bacterium, Clavibacter michiganensis subsp. Nebraskensis (CMN). It was first found in Nebraska in 1969, and has since spread across the corn-growing regions of the US. In the last decade, the disease has arrived in Canada.