Pernezny, Ken, Monica Elliott, Aaron Palmateer, and Nikol Havranek. 2008. “Guidelines for Identification and Management of Plant Disease Problems: Part II. Diagnosing Plant Diseases Caused by Fungi, Bacteria and Viruses: PP249 MG442, 2 2008”. EDIS 2008 (2). Gainesville, FL. https://doi.org/10.32473/edis-mg442-2008.