erwinia amylovora bacterium that provoked the disease, bacterial burn of young shoots of the apple tree

agriculture amylovora antibiotic apple apples bacteria bio blight branch contagious death detail disease diseases domestica dried dry enterobacteriaceae enterobacteriales ervinia erwinia falling fire fireblight fruit fungicides fungus gammaproteobacteria garden gardening green herbicides horticulture illness infections insecticides leaves malus orchard organic pathogen pears pesticides plant problem proteobacteria resistance tree trees withered