Abstract
Fungus-challenged sapwood of Photinia davidiana and Pyracantha coccinea produced two new dibenzofuran phytoalexins, 7-methoxyeriobofuran and 9-hydroxyeriobofuran, respectively. The known eriobofuran was also confirmed in both species. On the other hand two Crataegus species produced antifungal dibenzofurans constitutively in the bark; the major constituent is now identified as 2,8-dihydroxy-3,4,7-trimethoxydibenzofuran. The antifungal activities (ED 50) of the newly reported dibenzofurans against three plant pathogens were in the range of 55 to 328 μg ml −1, comparable with those of the cotonefurans. The taxonomic aspects are discussed briefly.
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