|Kirk, William -|
Submitted to: Extension Reports
Publication Type: Experiment Station
Publication Acceptance Date: August 2, 2012
Publication Date: August 2, 2012
Citation: Kirk, W.W., Hanson, L.E. 2012. First report of Strobilurin resistance in populations of Cercospora beticola now published. Extension Reports. Available: http://msue.anr.msu.edu/news/first_report_of_strobilurin_resistance_in_populations_of_cercospora_leaf_spot_now_published. Technical Abstract: The first samples of Cercospora beticola insensitive to Strobilurin fungicides have been reported in the 2012 season. Growers should refer to the article by Steve Poindexter on recommendations for Cercospora leaf spot control. For further information, the first report of Strobilurin resistance in populations of Cercospora beticola the cause of Cercospora leaf spot (CLS) in Michigan and Nebraska has now been published. In 2011, fields from several areas in Michigan, USA treated with Strobilurins had severe CLS and diminished control was also noted in small plot trials. In addition to the fungicide sensitivity monitoring service we are able to offer a fast turnaround of samples (about 48 h) using a molecular diagnostic tool for QoI resistance in CLS. These isolates are compared against isolates known to be sensitive to QoI fungicides. The first samples were received on 31 Jul and results sent out on 1 Aug and both were insensitive to QoI fungicides.