西洋杜鹃是近些年广东新引进的一种重要盆栽花卉 ,但根腐和茎基腐发生严重 ,常造成大量死亡。通过病组织分离、接种试验及病原菌鉴定 ,结果表明该病是由帚梗柱孢霉 (CylindrocladiumscopariumMorgan)、烛台帚梗柱孢霉 (C candelabrumViegasBragantia )和柑橘褐腐疫霉 [Phytophthoracitrophthora (R E Smith)Leonian]引起。当Cylindrocladiumspp 与P citrophthora复合侵染时 ,其发病程度更为严重 Western Rhododendron is an important potted flower newly introduced in Guangdong in recent years. However, the root rot and the stem rot are serious and often cause a large number of deaths. The results showed that the disease was caused by Cylindrocladium scoparium organism, C candelabrumViegasBragantia and Phytophthoracitrophthora (RE Smith) Leonian by diseased tissues, inoculation test and pathogen identification. cause. When Cylindrocladiumspp and P citrophthora compound infection, the incidence of more serious