Elliott, Monica, Ken Pernezny, Aaron Palmateer, and Nikol Havranek. 2008. “Guidelines to Identification and Management of Plant Disease Problems: Part I. Eliminating Insect Damage and Abiotic Disorders: PP248/MG441, 2/2008”. EDIS 2008 (2). Gainesville, FL. https://doi.org/10.32473/edis-mg441-2008.