Japanese Journal of Phytopathology
Online ISSN : 1882-0484
Print ISSN : 0031-9473
ISSN-L : 0031-9473
Disease Notes
Powdery mildew of watermelon (Citrullus lanatus) caused by Podosphaera xanthii in Japan
T. TAKUSHI, A. AJITOMI, H. MAEUEJO, M. MIYAGI
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Keywords: ITS, Podosphaera, powdery mildew, watermelon
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2025 Volume 91 Issue 2 Pages 76-80

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Abstract

Powdery mildew was found on watermelon (Citrullus lanatus) in Okinawa Prefecture, Japan in February and May 2024. The associated fungus was identified as Podosphaera xanthii based on morphological characteristics of the anamorph and molecular analysis of rDNA-ITS regions. No chasmothecium was observed. Podosphaera xanthii is proposed as another powdery mildew pathogen on watermelon in Japan.

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© 2025 The Phytopathological Society of Japan
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