First Report of Japanese Apple Rust Caused by Gymnosporangium yamadae on Malus spp. in North America.

  title={First Report of Japanese Apple Rust Caused by Gymnosporangium yamadae on Malus spp. in North America.},
  author={H. Yun and A. M. Minnis and A. Rossman},
  journal={Plant disease},
  volume={93 4},
Plants in the genus Malus Mill. are grown in temperate regions for fruit crops such as apple and ornamental landscape plants such as flowering crab apple. Gymnosporangium yamadae Miyabe ex G. Yamada, cause of Japanese apple rust, is known to attack economically important species of Malus in Asia. In August 2004 and July 2008, the aecial stage of a rust fungus was observed in Wilmington, DE and nearby in Media, PA on leaves of toringo crab apple (Malus toringo (Siebold) Siebold ex de Vriese), a… Expand
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