Foliar diseases of nursery-grown ornamental palms in Queensland.
The pathogenicity of Bipolaris [Drechslera] incurvata, B. [Cochliobolus] cynodontis, Exserohilum rostratum [Setosphaeria rostrata] and Cylindrocladium floridanum to 12 palm spp. was determined, as well as the pathogenicity of a range of 7 fungi on 7 palms (with or without wounding). Fungi found associated with particular palms and other ornamental plants were also listed. These results included an extended host range for some palm pathogens and many new records for Qld. D. incurvata, previously only recorded as a pathogen of coconut palm, attacked many of the popular palms grown in nurseries. S. rostrata, a pathogen of palms in Florida, was generally a pathogen of palms in Qld. Very young palms were more susceptible to leaf spot diseases than older plants, and complete death of some, including Howeia and Washingtonia, followed severe infection.