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Transcript
Downy Mildew of Wheat Sclerophthora macrospora (Sacc.)Thirumalachar et al. Downy mildew usually is associated with wheat plants grown in poorly drained areas. Plant symptoms produced by downy mildew vary. Some diseased plants tiller excessively and are severely dwarfed, with many tillers growing only a few inches tall. Other plants have thickened leaves that are yellow striped, fleshy, twisted, curled and stiff. These plants rarely produce heads, and those heads that are produced are distorted and abnormally large. The stem below the affected heads may be thick and deformed. In bearded varieties, the beards can be distorted and abnormally long. Diseased heads produce no viable grain. Proper soil preparation to improve surface drainage and remove debris will reduce disease incidence. Rotation with noncereal crops and use of clean seed provide some control. Other control measures usually are not warranted. Authors: Clayton A. Hollier, Ph.D., Professor Department of Plant Pathology and Crop Physiology Guy B. Padgett, Ph.D., Professor Macon Ridge Research Station Don Groth, Ph.D., Professor Rice Research Station Figure 1.Typical downy mildew symptoms Visit our website: www.LSUAgCenter.com Louisiana State University Agricultural Center William B. Richardson, Chancellor Louisiana Agricultural Experiment Station John S. Russin,Vice Chancellor and Director Louisiana Cooperative Extension Service Paul D. Coreil,Vice Chancellor and Director Pub. 3250 (online only) 1/13 The LSU AgCenter is a statewide campus of the LSU System and provides equal opportunities in programs and employment.