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http://dx.doi.org/10.5423/RPD.2010.16.3.316

Occurrence of Gray Mold on Yacon Caused by Botrytis cinerea  

Kim, Jeom-Soon (Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration (RDA))
Lee, Young-Gyu (Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration (RDA))
Kim, Su-Jeong (Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration (RDA))
Hong, Sung-Kee (Crop Protection Division, National Academy of Agricultural Science, RDA)
Choi, Hyo-Won (Crop Protection Division, National Academy of Agricultural Science, RDA)
Publication Information
Research in Plant Disease / v.16, no.3, 2010 , pp. 316-319 More about this Journal
Abstract
The gray mold disease occurred on tuberous roots of yacon in storage facilities in Gangneung, Korea, in March 2010. Symptoms typically appeared as in the form of dark brown discoloration on the surface of tuberous roots and water-soaked brown lesions in cross sections of the affected portions. A total of five isolates of Botrytis sp. were obtained from the symptomatic portions. All isolates on potato-dextrose agar (PDA) produced abundant conidia which were pale brown, one-celled, mostly ellipsoid or ovoid in shape and $8.2{\sim}14.8{\times}6.5{\sim}9.9\;{\mu}m$ in size. Large numbers of round to irregular, smooth, black, hard sclerotia were produced on PDA over time. The optimal temperature for mycelial growth and sclerotia formation of the fungal isolates was $20^{\circ}C$. On the basis of morphological and cultural characteristics, all the fungal isolates were identified as Botrytis cinerea. Pathogenicity test on host plants showed that the fungus could infect not only tuberous roots but also leaves and petioles of yacon. This is the first report on gray mold of yacon (Smallanthus sonchifolius) caused by Botrytis cinerea in Korea.
Keywords
Botrytis cinerea; Gray mold; Yacon (Smallanthus sonchifolius);
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