kerria twig and leaf blight - blumeriella kerriae

agriculture and ascomycetes back biology blight blumeriella cankers coccomyces conidia control danger die disease diseased farming fouling fungal fungi fungicide fungual fungus garden gardening grow higginsia home hyphe infection infest inoculum japonica kerria kerriae leaf lesions macro microorganism mold mould nature orcharding parasite pathogen pathology pest pesticide phytopathology plague plant problem protection pustules repellent rotting science shriveled spore spores sporulation spot stem summer symptoms tree twig