The head scab model is currently showing low risk, however this may change with predicted moisture and warm temperatures.

Winter wheat development in Michigan ranges from flag leaf to boot stage, with flowering expected within the next week or two. Overall leaf diseases have been minimal to date, however heavy powdery mildew have been reported in areas of the state. To date stripe rust has not been reported in Michigan, however many fields have wheat streak mosaic virus that can be confused for stripe rust.

Management of head scab should start with selection of varieties with good resistance. To optimize management, fungicides may be warranted. For optimal head scab and DON suppression fungicides should be applied from the beginning of flowering up to 7 days post the beginning of flowering, with recent research demonstrating 4 days post head emergence being optimal for head scab and DON suppression. Fungicides applied for head scab management will also provide protection of the flag leaf.

Winter barley is heading in central Michigan. Fungicides for management of head scab in barley should be applied 4-7 days once heads have fully emerged.

A discussion on managing wheat and barley diseases and head scab can be found as part of our MSU virtual breakfast series https://www.canr.msu.edu/field_crops/virtual-breakfast/

Wheat and barley disease management discussion for 2025 is posted here: https://www.canr.msu.edu/videos/disease-management-in-wheat-and-small-g…

--Martin Chilvers, Associate Professor, Field Crop Pathology, Michigan State University