Outbreak of Powdery Mildew on Zinnia elegans by Golovinomyces cichoracearum in Korea, 2008-2010

Park, Mi Jeong; Park, Ji Hyun; Kim, Hong Gi; Lee, Soon Gu; Koh, Young Jin; Kim, Byung Sup; Cha, Byeong Jin; Lee, Hyang Burm; Shin, Hyeon Dong

The Plant Pathology Journal 2011;27(1):85-88.
Published online March 31, 2011.

Outbreak of Powdery Mildew on Zinnia elegans by Golovinomyces cichoracearum in Korea, 2008-2010

Mi Jeong Park, Ji Hyun Park, Hong Gi Kim, Soon Gu Lee, Young Jin Koh, Byung Sup Kim, Byeong Jin Cha, Hyang Burm Lee, Hyeon Dong Shin

Abstract

Podosphaera fusca (syn. Sphaerotheca fusca, S. fuliginea) is a causal agent of powdery mildew infections on Zinnia elegans, and has been documented in Korea since 1967. An outbreak involving about 1,000 plants in October 2008, in Yangpyeong, Korea, was caused by Golovinomyces cichoracearum. Further surveys of zinnia powdery mildew from 2008-2010 confirmed the widespread occurrence of Zinnia-Golovinomyces association in Korea. Chasmothecia of this fungus have not been found on Z. elegans in Korea. Analysis of internal transcribed spacer rDNA from five Korean collections confirmed the powdery mildew as G. cichoracearum. Comparison with the those from GenBank revealed 100% identity with sequences from zinnia powdery mildew, forming a monophyletic clade with 100% bootstrap support, and with those of G. cichoracearum parasitic on the hosts belonging to the tribe Heliantheae of the family Asteraceae.

Key Words: Heliantheae, ITS sequence, Podosphaera fusca, Reticuloidium