Graph of 2008-2009 Medium Square Alfalfa 4/16/09
Thursday, April 16, 2009
Thursday, April 2, 2009
Wednesday, April 1, 2009
Charla Hollingsworth, UM Extension Plant Pathologist, and Jeff Stein, South Dakota State University Plant Pathologist
Crown rust (caused by Puccinia coronata var avenae) and stem rust (caused by Puccinia graminis f.sp. avenae) are widespread and common on oat in the North Central (NC) state region. If environmental conditions promote rust development on susceptible hosts prior to grain fill, significant crop losses are likely to occur. While both diseases are responsible for repeated losses in oat, crown rust has a history of being the most damaging in this region because epidemics occur with more regularity.