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Texas AgriLife Extension Service Factsheets, Texas A&M University System, 2009, English language
Cornell University Vegetable MD Online, Cornell University Plant Pathology Department, 1998, English language
Cornell University Factsheets, Cornell University Plant Pathology Department, 2011, English language
British Columbia Ministry of Agriculture Factsheets, Government of British Columbia, 2012, English language
University of California factsheets, University of California, 2016, English language