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近几年,北京杨炭疽病在北京市发生普遍而严重。病害多发生于树冠中下部的枝叶上,引起叶枯、芽枯和梢枯。每年6—7月开始出现症状,9月上中旬病情达到高峰,以后趋于稳定。通过叶柄刺伤接种,诱发出病害典型症状。病原是盘长孢状刺盘孢Colletotrichum gloeosporioides Penz.,通过伤口侵入寄主,以菌丝体和分生孢子盘在病部越冬。翌年旧病组织中越冬菌丝的扩展,可能是导致病害初期症状的原因。
In recent years, Beijing Yang anthrax has been widespread and serious in Beijing. Diseases occur mostly in the lower part of the canopy leaves, causing leaf blight, bud blight and tip dry. Every year from June to July symptoms begin to peak in mid-September and then stabilized. Stabbed through petiole inoculation, typical symptoms of disease induced. The pathogen is Colletotrichum gloeosporioides Penz., Which invades the host through the wound and overwinters in the diseased part with mycelium and conidia. The overwintering mycelial expansion in old disease tissues next year may be responsible for the initial symptoms of the disease.