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http://dx.doi.org/10.5423/RPD.2007.13.1.015

Occurrence and Pathogenicity of Verticillium Wilt on Chrysanthemum Caused by Verticillium dahliae  

Han, Kyung-Sook (Horticultural Environment Division, National Horticultural Research Institute, Rural Development Administration)
Park, Jong-Han (Horticultural Environment Division, National Horticultural Research Institute, Rural Development Administration)
Lee, Jung-Sup (Horticultural Environment Division, National Horticultural Research Institute, Rural Development Administration)
Seo, Sang-Tae (Horticultural Environment Division, National Horticultural Research Institute, Rural Development Administration)
Cheong, Seung-Ryong (Horticultural Environment Division, National Horticultural Research Institute, Rural Development Administration)
Publication Information
Research in Plant Disease / v.13, no.1, 2007 , pp. 15-19 More about this Journal
Abstract
A wilt disease on the greenhouse-grown chrysanthemum occurred at Kumi, Masan and Busan, Korea in $2003{\sim}2005$. Symptoms of wilting, yellowing, and marginal burning started from lower leaves and progressed upward. Early symptoms often appeared on one side, involving only one part of the plant or one side of individual leaves or stems without a vascular discoloration. Vascular tissues of the infected leaf-base's discolored to brown. Fungal isolates obtained from discolored tissues were identified as Verticillium dahliae based on its cultural and morphological characteristics. The fungus showed whitish to creamy colony pattern with abundant dark brown to black elongated microsclerotia on PDA. Conidiophores were verticillately branched and conidia were ellipsoidal to sub-cylindrical shape, and measured as $2.5{\sim}8.8{\times}2.0{\sim}3.8{\mu}m$. Pathogenicity tests by root dipping resulted in similar symptoms observed in the naturally infected chrysanthemum in fields.
Keywords
Chrysanthemum; Pathogenicity; Verticillium dahliae;
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