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Occurrence of Diseases and Insects in Organic Sweet Corn Seed Production Area  

Kim, Jeong-Soon (농촌진흥청 농업유전자원센터)
Goh, Byeong-Dae (강원도 농업기술원 옥수수시험장)
Gwag, Jae-Gyun (농촌진흥청 농업유전자원센터)
Lee, Myung-Chul (농촌진흥청 농업유전자원센터)
Kim, Chang-Yung (농촌진흥청 농업유전자원센터)
Kim, Chung-Kon (농촌진흥청 농업유전자원센터)
Shim, Chang-Ki (농촌진흥청 농업유전자원센터)
Publication Information
Korean Journal of Organic Agriculture / v.18, no.1, 2010 , pp. 93-104 More about this Journal
Abstract
This study was conducted screening of the population densities of fungal pathogens and insect and observed the disease symptoms on the organic sweet corn seed producing field from 2008 to 2009. The dissemination spores, Alternaria sp., Cladosporium sp., Helminthosporium sp., Pyricularia sp., Collectotrichum sp., and Bipolaris sp., were detected and the three fungal spores from the front were observed for whole growth stage. Seed and seedling diseases were shown as the rotted seed and damping-off seedling caused by Penicillium sp. and Rhizoctonia sp.. The larva of Black cutworm cut down the root crown of seedlings. The damaged plants were ranged from 14% to 16%. On the Oriental corn borer, the population densities and the percentage of damaged plants were showed a low difference between two sweet corn varieties. The population densities of Oriental corn borer were scored as from 3.5 to 20.5 in 2008 and from 0.5 to 6 in 2009. Also the percentage of damaged plants were significantly increased until harvesting stage and was recorded from 7.5% to 21% in 2008 and from 1% to 46% in 2009. On the Corn leaf blight, the percentage of diseased plant were scored from 7% to 34% in 2008. The first occurrence of date was after June 18, and the percentage of diseased plant was continuously increased after August 21 and the values of diseased plants was ranged from 56% to 69% in 2009. On common smut, the percentage of diseased plant was recorded from 5% to 15% in 2008, and the first occurrence date were delayed as 17 days (July 17) and were showed less than 8% of diseased plants in 2009. Corn Southern Leaf spot was scored as average 11% at early stage and showed high score as 62% at September 19 in 2008. In 2009, the first occurrence date were advanced about 20 days (after June 8), and continuously increased up to 86% in 2009.
Keywords
organic seed production; sweet corn; mibaeg2ho; heugmichal;
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Times Cited By KSCI : 3  (Citation Analysis)
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