2010 Volume 2010 Issue 57 Pages 55-57
Stem rot disease of potted hydrangea (Hydrangea macrophylla (Thunb.) Ser.) occurred in Gunma Prefecture. Two of four isolates from affected hydrangea plants were identified as Phoma exigua Desmaz., a pathogen of leaf spot disease of hydrangea, and the others were identified as Phoma spp. by investigating mycological properties and analyzing DNA sequence of ITS-rDNA region.