Location: Sugarbeet and Bean ResearchTitle: Leaf spot detections in Michigan sugar beet fields, 2019
|BUBLITZ, DANIEL - Michigan State University|
|WILBUR, JAMIE - Michigan State University|
Submitted to: Michigan State University Extension
Publication Type: Other
Publication Acceptance Date: 6/21/2019
Publication Date: 6/21/2019
Citation: Bublitz, D.M., Wilbur, J.F., Hanson, L.E. 2019. Leaf spot detections in Michigan sugar beet fields, 2019. Michigan State University Extension. https://www.canr.msu.edu/news/leaf-spot-detections-in-michigan-sugarbeet-fields.
Technical Abstract: Cercospora and Alternaria leaf spot were detected in the Michigan sugar beet production region. Lesions were found at the Saginaw Valley Research and Extension Center on June 17 and in local commercial fields on June 18. Severity was generally low in these fields, however, high pressure areas of early (April) planted fields may be experiencing higher numbers of leaf spots. Cercospora leaf spot is caused by Cercospora beticola, a fungus which is favored by warmer temperatures (75-95F) and high humidity. Alternaria leaf spot is caused by various Alternaria spp., which are fungi that are favored by relatively cool temperatures and high humidity. Despite cooler air temperatures in Michigan this season, high humidity conditions have been conducive for the development of both diseases, as confirmed by these first spot reports.