1. Department of Plant Pathology, University of Florida, Gainesville, Florida, USA
2. College of Plant Protection, Jilin Agricultural University, Changchun, Jilin, China
3. Department of Plant Pathology, Kansas State University, Manhattan, Kansas, USA
4. High Plains Plant Disease Diagnostic Lab, Texas A&M AgriLife Extension Service, Amarillo, Texas, USA
5. Chemistry Research Unit, US Department of Agriculture-Agricultural Research Service, Gainesville, Florida, USA