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1985年5月,在北京市花木公司南郊花圃的大花天竺葵 Pelagoniumgrandiflorum 上发现了一种新的细菌病害,病原细菌为 Rhodococcus fascians(Tilford)Goodfellow。这个病菌寄主范围很广,为害18个科30个属的植物,通过土壤、种子和无性繁殖材料传播,根治较为困难。其症状是在植株近地表和主茎分枝处产生许多大小不一的瘤状物,这些瘤由混乱生长的小芽和小叶组成,直径0.5～5cm,受病植株长势衰弱,明显矮化,鲜花减产,重病株叶片枯黄。从病组织分离到的病原细菌,其培养和生化性状与标准菌相同。致病性测定是选用绿珠豌豆幼苗接种,10天以后表现症状。此病在我国为首次报道,我们根据在天竺葵上的症状暂定名为天竺葵叶瘿病。
In May 1985, a new bacterial disease was found on Pelagonium grandiflorum in the southern suburbs of Huamu, Beijing. The pathogen was Rhodococcus fascians (Goodfellow). This host has a wide host range of pathogens, infestation of 18 families and 30 genera of plants, disseminated through soil, seeds and asexual reproduction materials, cure more difficult. The symptoms are in the plant near the surface and the main stem branches produce many different size of the tumor, these tumors by the confusion of small buds and leaflets, diameter 0.5 ~ 5cm, the affected plants grow weak, significantly dwarf, Flowers cut, sick leaves yellowish brown. Pathogenic bacteria isolated from diseased tissue culture and biochemical traits and the same standard bacteria. Pathogenicity test was selected green pea seedling inoculation, symptoms after 10 days. The disease was first reported in our country, and we tentatively named Pelargonium spp. Based on the symptoms on geranium.