Root Rot of Miniature Roses Caused by Pythium helicoides

  title={Root Rot of Miniature Roses Caused by Pythium helicoides},
  author={Koji Kageyama and Tomoaki AOYAGI and Rumi SUNOUCHI and Hirokazu Fukui},
  journal={Journal of General Plant Pathology},
Miniature roses growing in an ebb-and-flow watering system developed dieback during the summer growing season of 1996 in Gifu Prefecture. The main diagnostic symptoms were chlorosis of leaf followed by blight, and a brown, water-soaked root rot followed by dieback. Pythium isolates were recovered from the rotted root. The isolates form proliferous ellipsoidal papillate sporangia, spherical smooth oogonia, elongate antheridia, and aplerotic oospores. The optimum temperature for hyphal growth was… CONTINUE READING
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