1. Crop Protection, National Academy of Agricultural Science, 166, Nongsaengmyeong, Iseo, Wanju 553-65, Korea
2. Extension Service Bureau, Rural Development Administration, 200, Nongsaengmyeong, Wansam, Jeonju 548-75, Korea
3. Department of Applied Biology, Kangwon National University, Chuncheon 200-701, Korea
4. Department of Horticultural Biotechnology, College of Life Sciences, Kyung Hee University, Yongin 446-701, Korea.