Monthly Diagnostic Reports The monthly diagnostic reports are a collaboration between the Plant Diagnostic Lab, Home & Garden Education Center, and County Extension Master Gardener Offices. The diagnostic reports are compiled each month during the growing season, between May and September. 2020 Diagnostic ReportsMay June July Volutella blight on pachysandra. Photo by A. Beissinger. 2019 Diagnostic ReportsJune July August September Tobacco rattle virus on peony. Photo by A. Beissinger 2018 Diagnostic ReportsMay June July Basil downy mildew on Genovese basil. Photo by J. Allen
