botrytis blight of geranium in a flower box

agriculture and biology blight botrytis box cinerea control danger disease diseased drip drop farming flower fungi fungicide fungual fungus garden gardening geranium gray green grow growing home infection infest irrigation leaf macro media microorganism mold mould nature parasite pathogen pathology pelargonium pest pesticide phytopathology plague plant planter problem protection pustules rain repellent science soil spores symptoms water wet