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马尾松疱锈病是一种严重的病害,病菌的性孢子、锈孢子(0、Ⅰ)阶段发生在马尾松(Pinus massoniana Lamb.)枝干上,夏孢子、冬孢子(Ⅱ、Ⅲ)阶段出现在玄参科的阴行草(Siphonostegia chinensis Benth.)叶背、茎、萼片及果实上。取马尾松病杆上的锈孢子人工接种,只有阴行草转主寄主植物感病,产生与自然状态下相同的典型症状。该病菌性孢子器平展成不规则形,生于表皮下;锈孢子表面塔状疣突的基部两层环纹很厚;冬孢子柱较小,长度很少超过800μm。因此,认为马尾松疱锈病的病原是松芍柱锈菌[Cronartium flaccidum(Alb.et Schw.)Wint.]集合种的阴行草专化型(C.flaccidum f.sp.siphonostegium)。
Pinus massoniana rust is a serious disease. The pathogen of bacteria is spores. The stage of spore (0, Ⅰ) occurs on the branches of Pinus massoniana Lamb. In the Scrophulariaceae Yin grass (Siphonostegia chinensis Benth.) Leaves back, stems, sepals and fruits. Take Pinus massoniana rod rust on artificial inoculation, only the host plants of Yin-Yin grass turn infected, produce the same with the natural state of the typical symptoms. The pathogen spores flattened into an irregular shape, was born in the epidermis; rust spores on the surface of the tower wart of the base two ring thick; teliospores smaller, length less than 800μm. Therefore, it is considered that the pathogen of Pinus massoniana rust is C. flaccidum f. Sp. Siphonostegium belonging to the genus Cronartium flaccidum (Alb. Et Schw.) Wint.