macro of an amaryllis leaf affected by red blotch or “leaf scorch` stagonospora curtisii

affected agronomy amaryllis become blotch bulb curtisii disease diseases elongate enlarge flower fungal fungi fungus garden green health humid ill illness infected infection infectious infest leaf leaves macro necrosis orchard overwinter pathogen pathology plant prevention problem problems protection red rural scorch sick spot spots spread stagonospora stalks sunken treatment viral