E.carotovora(胡萝卜欧文氏菌) → cabbage soft rot(白菜软腐病) 。 Infects through wound Secreting pectic enzymes( 胶酶)，destructing middle lamella(中胶层)and the cell wal(细胞壁) Overwintering(越冬)in diseased plants or its residues(残体)，composts(堆 肥)and soil Spreading(传播)by insect, rainwater,irrigating and farming activities
E. carotovora ( 胡萝卜欧文氏菌） → cabbage soft rot（白菜软腐病） • Infects through wound • Secreting pectic enzymes (果 胶酶)，destructing middle lamella(中胶层） and the cell wall（细胞壁） • Overwintering（越冬） in diseased plants or its residues (残体), composts(堆 肥) and soil • Spreading（传播） by insect, rainwater, irrigating and farming activities. • Control Strategies
E.tracheiphila (噬维管欧文氏菌)→ cucumber bacterial wilt(黄瓜细菌性萎蔫) survive in sidues stines(肠) Control,7 insect r bundle(维 of a leaf,then hole plant
E. tracheiphila （噬维管欧文氏菌） → cucumber bacterial wilt（黄瓜细菌性萎蔫） • Bacteria hardly survive in diseased plant residues • Overwintering in intestines(肠) of flea beetles(跳甲) • Entering leaf vein with insect feeding • Spreading in vascular bundle(维 管束) • Wilting parts of a leaf, then the whole plant Control？
E.amylovora (噬/解淀粉欧文氏菌)→Fire Blight photo 2-20-K.D.Hickey
E. amylovora （噬/解淀粉欧文氏菌） → Fire Blight
Fire blight ·Symptom-Brown wilt(褐色、枯萎) Most economically important ·Overwintering"holdover"canker(溃疡边缘活组织) Entering blossoms(花)through nectary(蜜腺)with insect feeding or via rain/irrigating through stomas()/wound ·Spreading intercellularly(细胞间隙) ·Transmitting by transportation of seedlings(随苗木调运远 距离传播)
Fire blight • Symptom - Brown wilt(褐色、枯萎） • Most economically important • Overwintering “holdover” canker (溃疡边缘活组织） • Entering blossoms（花） through nectary(蜜腺) with insect feeding or via rain/irrigating through stomas(气孔)/wound • Spreading intercellularly（细胞间隙） • Transmitting by transportation of seedlings（随苗木调运远 距离传播）
Management of Fire blight ·Resistant cultivars Field/orchard/nursery sanitation ·Chemicals antibiotics(抗菌素)-streptomycin(链霉素) ·Biological control avirulent strains of E.amylovora P.fluorescens -site exclusion
Management of Fire blight • Resistant cultivars • Field/orchard/nursery sanitation • Chemicals antibiotics(抗菌素）- streptomycin（链霉素） • Biological control avirulent strains of E. amylovora P. fluorescens -site exclusion