It does not guarantee an economical return. At, or just before stage 7, make a disease evaluation. Then use the point guide to determine the need to spray. Additional applications through stage 10.5, flowering, may sometimes be beneficial, particularly for control of Stagonospora glume blotch. Viruses Among the disease problems, viruses pose the most troublesome due to a lack of good control methods.
Resistant varieties are the only means of control.
Identification of the virus, lack of inoculum for effective testing and expense of detection make it difficult to identify virus related problems and develop effective prevention programs. Most varieties grown in Georgia today demonstrate good tolerance to soil-borne mosaic and wheat spindle streak. Little is known though of the differences in variety tolerance or resistance to barley yellow dwarf. The symptoms of soil-borne mosaic virus range from mild green to a prominent yellow leaf mosaic. Plants may appear to be stunted or rosette in shape.