U of A University of Arkansas Division of Agriculture

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Plant Diseases
Wheat Diseases in Arkansas
Downy Mildew

Picture of Downy Mildew disease on wheat.Downy mildew, caused by the fungus Sclerophthora macrospora, frequently occurs in areas of fields subject to flooding. Symptoms appear in the spring as stunted yellow plants. Severely stunted plants have many tiny stems and usually die before heading. Leaves of infected plants feel thick and leathery. Less severely infected plants may elongate and produce distorted heads with no grain.

The pathogen attacks wheat, oats, barley, rice, corn, sorghum and about 140 species of wild grasses. All adapted wheats are believed to be susceptible. The fungus produces thick-walled survival spores within infected tissue. Under flooded conditions these germinate to produce several motile spores that "swim" in water. These penetrate leaf sheaths, and then the fungus becomes systemic within the plant. Seedlings are more susceptible than adult plants.

Avoiding areas prone to flooding and providing for adequate drainage of surface water are the best means of controlling downy mildew. Apron fungicide seed treatment, which is registered for control of Pythium root rot, may provide protection against downy mildew for a few weeks after planting. However, under Arkansas conditions flooding may occur over a period of several months after planting. 

 

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Last Date Modified 10/22/2009
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University of Arkansas • Division of Agriculture
Cooperative Extension Service
2301 South University Avenue
Little Rock, Arkansas 72204 • USA
Phone (501) 671-2000 • Fax (501) 671-2209
 

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