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http://dx.doi.org/10.5423/PPJ.2003.19.4.200

Detection of Myrothecium Leaf Spot, A New Disease of Watermelon  

Kim, Dong-Kil (Research Institute of Life Science, Gyeongsang National University)
Bae, Dong-Won (Central Laboratory, Gyeongsang National University)
Lee, Sun-Chul (Research Institute of Life Science, Gyeongsang National University)
Han, Ki-Soo (Division of Plant Resources and Environment, Gyeongsang National University)
Kim, Hee-Kyu (Division of Plant Resources and Environment, Gyeongsang National University)
Publication Information
The Plant Pathology Journal / v.19, no.4, 2003 , pp. 200-202 More about this Journal
Abstract
Leaf spots were first observed on watermelon (Citrullus vulgaris Schrad) under polyethylene film-covered green-house in November 2002. Symptoms appeared as dark-brown circles or large irregular spots on the leaves of watermelon. Occasionally, zonal growth of the lesions was observed. Under humid conditions, small black sclerotium-like bodies (sporodochia) were produced on the surface of the lesions. The sporodochia on leaf lesions were sessile, polymorphic, variable in size, 35-850 $\mu\textrm{m}$ in diameter, and 30-470 $\mu\textrm{m}$ in depth. Conidia in sporodochium were black in mass, one-celled, rod-shaped, with rounded ends, hyaline, guttulate, and measured 6-8$\times$1.6-2.2 $\mu\textrm{m}$ in size. The pathogen was identified as Myrothecium roridum Tode ex Fr. This is the first report of Myrothecium leaf spot on watermelon naturally occurring in commercial greenhouses.
Keywords
Cucurbits; leaf spot; Myrothecium roridum; watermelon;
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