Gray leaf spot continues to be the most bothersome leaf disease in Iowa. In our research plots, susceptible check hybrids were noticeably more diseased this year than they have been during the past couple of years. But it also was very noticeable how much better the majority of hybrids in the Iowa Crop Performance Test looked compared with the check hybrids.
Iowa State University
Munkvold, Gary P., "Hybrid reactions to gray leaf spot" (2002). Integrated Crop Management News. 1761.
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