Tan spot and Septoria were observed on the flag leaf in most wheat fields. The two barley fields surveyed showed symptoms of Septoria, barley yellow dwarf and head scab. Laura Neal, Holly Semler, and Allison Marsland surveyed fields in McHenry, Pierce, Renville, Bottineau, Rollette, Williams, and Divide counties this past week. Pasmo, caused by Septoria linicola , is spread by splashing water, and so is most likely to develop in areas that have had frequent rain showers. It is also more likely to develop in flax that has lodged.
First symptoms are circular brown spots on the leaves.
The older leaf spots will develop tiny black fruiting bodies the size of finely ground pepper. The fruiting bodies may be arranged in a target pattern. As the crop matures, infections develop on the stem. These infections result in a botchy pattern of brown and green on the stem. Fruiting bodies may form on the stem.