Journal of General Plant Pathology

, Volume 67, Issue 4, pp 268–272 | Cite as

Alternaria Leaf Spot on Three Species of Pelargonium Caused by Alternaria alternata in Japan

  • Toshiko FURUKAWA
  • Kunihei KISHI

A new disease of pelargonium (Pelargonium domesticum Bailey), ivy geranium (P. peltatum (L.) L'Hér. ex Ait.) and scented geranium (P. graveolens L'Hér.), primarily causing brown spots on leaves, was found in Kawasaki-shi in Kanagawa Prefecture and Tachikawa-shi in Tokyo. An Alternaria sp. was consistently isolated from these diseased leaves, and the isolates were pathogenic to their host leaves. Based on morphological characteristics, the causal fungus in all three cases was identified as Alternaria alternata (Fr.) Keissler. Because Alternaria leaf spot of geranium by A. alternata has already been reported, the pathogenicity of isolates from four groups of genus Pelargonium was investigated. The isolates from scented geranium were pathogenic only to their original host, but the isolates from pelargonium, ivy geranium and geranium were pathogenic to all groups of pelargonium. This is the first report of this disease on pelargonium, ivy geranium and scented geranium caused by A. alternata in Japan. We propose the names for these diseases as Alternaria leaf spot of pelargonium (kappan-byo), Alternaria leaf spot of ivy geranium (kappan-byo) and Alternaria leaf spot of scented geranium (kappan-byo).

Key words : ivy geranium, pelargonium, scented geranium, Alternaria alternata. 


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Copyright information

© The Phytopathological Society of Japan 2001

Authors and Affiliations

  • Toshiko FURUKAWA
    • 1
  • Kunihei KISHI
    • 2
  1. 1.Tokyo Metropolitan College, Azuma-cho, Akishima 196–8540, JapanJP
  2. 2.Association for Advancement of Agricultural Science, Nishigahara, Kita-ku, Tokyo 114–0024, JapanJP

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