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Changes in Sensitivity Levels of Botrytis spp. Population Isolated from Lily to Fungicides and Control under Field Condition
Res. Plant Dis. 2013;19:7-11
Published online March 30, 2013
© 2013 The Korean Society of Plant Pathology.

Soosang Hahm1*, Kicheon Kyeong2, Byungryun Kim1, Kwangseop Han1, Jongjin Choi2, Yunkyu Nam1 and Seunghun Yu3

1Agricultural Environment Research Division, Chungnam Agricultural Research and Extension Services, Yesan 340-861, Korea
2Taean Lily Experiment Station, Chungnam Agricultural Research and Extension Services, Taean 357-952, Korea
3Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 305-764, Korea
Phone) +82-41-330-6288, Fax) +82-41-331-1919
Email) hahmsoo@korea.kr
Received December 7, 2012; Revised February 12, 2013; Accepted February 28, 2013.
cc This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Forty eight isolates of Botrytis elliptica and 23 isolates of B. cinerea from several locations in Korea were tested for resistance to fungicides used in the farmer's fields. Isolation frequency of B. elliptica having EC50 (effective concentration of 50%) value 500?1000 μg/ml to benomyl and mancozeb appeared highly, suggesting that the two fungicides are not effective in controlling leaf blight of lily in the field. The isolates were tested for resistance to fungicides procymidone and iprodione which were most commonly used in the farmer's fields. The rates of EC50 value 5?50 μg/ml to procymidome and iprodione were 93.7% and 100%, respectively, and those of 0?0.1 μg/ml to diethofencarb+carbendazim and fludioxonil were 98.0% and 93.8%, respectively. In the rain-protected cultivation, control of leaf blight of lily was the most effective when iprodine, diethofencarb+ carbendazim, and fludioxonil were sprayed alternately four times during the growing season.
Keywords : Benzimidazole, Botrytis cinerea, Botrytis elliptica, Dicarboximide


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