Resistant Varieties Wheat varieties differ widely in susceptibilty to both species of Septoria . Differences in susceptibility also exist relative to foliage and head infection by the same species of Septoria . Generally, resistance to septoria leaf blotch complex is less developed than is resistance to glume blotch. In addition, no varieties have a high level of resistance to either leaf or glume blotch. For a listing of disease reactions of the most common wheat varieties grown in Kentucky, consult the Kentucky Small Grains Variety Trial bulletin, published by the University of Kentucky's Department of Agronomy, and available at your local county Extension office.
Fungicides are most effective when applied in the early stages of an epidemic.
Waiting too late to apply fungicides may negate their value altogether. On the other hand, applying fungicides too early in disease development may also be of limited or no value. Timing of fungicide application, thus, plays an important role in determining the level of disease control. Other factors to consider when using foliar fungicide are the use of appropriate rate of fungicide, using spray additives when necessary, and achieving good coverage of plants with fungicide. Protective fungicides, such as the mancozeb products, must be applied before infection occurs.