fungal plant disease powdery mildew on a pattypan squash bush (pattypan, scallop squash, patisson).

agriculture botanic close closeup control cucurbita pepo damage danger disease erysiphe cichoracearum farming filaments flora fungal fungus garden gardening green grow hyphae infection leaf leaves macro mildew nature outdoor pathogen pathology pattison patty pan pattypan squash pest plant diseases plaque powdery problem protect protection science shrub sick solanum lycopersicum spot summer white bush scallop patisson infected spots leaves