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Leaf Rust Becoming Problem in Kansas Wheat
4/30/2008
AgWeb.com Editors
The risk of significant yield loss in Kansas wheat fields due to leaf rust and other foliar diseases has increased dramatically this past week, according to Kansas State University Research and Extension.
Leaf rust was discovered in commercial fields and variety demonstration plots in Sumner County in south-central Kansas on April 24th, wheat plant pathologist Erick DeWolf said in a press release. The leaf rust occurred with an incidence of less than 10% and with severity of less than 2% in both the Jagger and Jagalene varieties.
Leaf rust has also been observed in northern Oklahoma where the disease was slightly more advanced. Leaf rust was observed at trace levels on the Overley variety near Stillwater in north-central Oklahoma, but the disease has not yet been detected in fields planted to Overley wheat in Kansas.
Powdery mildew has also increased significantly during this past week, KSU Extension reported, and was also cited in Sumner county. The severity of powdery mildew in the area was greater than 25%, which can result in significant yield loss.
The growth stages of wheat in the southern counties of Kansas range from jointing to early heading. The current presence of even low levels of leaf rust and severe powdery mildew suggests that potential for yield loss is significant. Yield losses of greater than 35% can be expected if the leaf rust and powdery mildew are not controlled with fungicides.
You can e-mail Tanner Ehmke at tehmke@agweb.com.
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