The spores are exuded in sticky masses and require hard rains to splash them up to the upper leaves and heads. Resistance to the two fungi that cause glume blotch is probably regulated by different resistance genes. Unfortunately, it is almost impossible to differentiate the two in the field, so ratings have been lumped together. Varieties with good resistance ratings are probably resistant to both causes of glume blotch. Shorter wheats seem to have more trouble with glume blotch because spores can splash to the heads more easily.
Foliar fungicides are an option for control of glume blotch.
However, fungicide applications must be made after heading in order to protect the glumes. Usually, fungicides are applied prior to heading because the main objective is to protect the flag leaf. Fungicide effectiveness against glume blotch is often incomplete even when timing is optimal. This will be most important on rotated ground where wheat residue is absent. Cultural controls are not very effective for this disease.