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六十年代后期继吹绵蚧大流行之后,主要在陕西城固垣山公社引起死树毁园的“爆皮”病是一种真菌性枝干溃疡(Canker),它和冬季落叶是并发症,都是由胶孢炭疽菌(暂拟名称)Colletotrichum gloeosporioides Penz.(SensuVon Arx,1975;non penzig,1887)在特殊条件下引发(inicted)的新症状。当年生的枯稍是接种剂的唯一来源。入侵期集中在10月下旬至11月上旬。桔树树势的极度衰弱和秋末冬初的叶、皮组织几无保卫反应的状态,相对增强了这个在当地久已存在的病原菌的侵袭力。所以,寄主保卫和病原菌入侵的均衡关系的破坏,是死树毁园的根本原因。在这种情况下,病菌并不是发病的原因,“它不过是发病的必要条件(Conditio sine quanon)而已。”
Following the pandemic blowing of Melaleuca in the late 1960s, the “bursting skin” disease that caused the dead tree destruction in the commune of Guchenggongshan in Shaanxi Province was a fungal stem-canker (Canker), which was a complication of winter deciduous leaves Are new symptoms of inicted under special conditions by Colletotrichum gloeosporioides Penz. (SensuVon Arx, 1975; non penzig, 1887). The current year’s dry slightly is the only source of inoculant. Invaders concentrated in late October to early November. The extreme frail condition of the orange trees and the unprotected reaction of the leaves and dermis in the late autumn and early winter relatively enhanced the invasiveness of this locally existing pathogen. Therefore, the destruction of the balance between host defense and pathogen invasion is the root cause of the dead tree destruction. In this case, the germs are not the cause of the disease, “it is but a condition of necessity (Conditio sine quanon).”