A1 forest pests
A whole session at the Congress was devoted to pine wilt disease caused by Bursaphelenchus xylophilus (EPPO Al List) (abstracts St.X-1.-1/8). This information is being reviewed by the EPPO ad hoc Panel on B. xylophilus.
Cercoseptoria pini-densiflorae (EPPO Al List), is regarded as a potentially dangerous pathogen for Southeast Asia and the Pacific Islands (E.D. Guzman, College of Forestry, Laguna, PH; abstract St.X-2-1).
Cronartium quercuum (EPPO Al List) occurs in Japan and Korea as well as USA. Research is under way on differences between Asian and American isolates on pine and oak hosts (R.R. Powers et al., USDA, Athens, Georgia, US; abstract St.X-3-4).
Dendroctonus ponderosae (EPPO Al List) seriously damages Pinus ponderosa in North America, and also transmits the blue-stain fungus Ceratocystis clavigera. First research results suggest that C. clavigera inoculated into pine could kill trees and seedlings, while other blue-stain fungi did not. Accordingly, the importance of D. ponderosae as a pest may be partly associated with its transmission of C. clavigera (Y. Yamaoka, Canadian Forestry Service, Edmonton, CA; abstract St.X-8-3).
Abstracts of the 5th International Congress of Plant Pathology, Kyoto (JP), 1988-08-20/27