Growth-inhibitory Effects of Citrus Oils and Synthetic Agricultural Fungicides on Molds Isolated from Putrefied Citrus Fruits

감귤 부패 사상균에 대한 감귤 정유와 시판 합성 농약의 항균 효과

  • Kim, Yu-Kyoung (Agricultural Environment Research Division, Chejudo Agricultural Research and Extension Services) ;
  • Koh, Jeong-Sam (Faculty of Horticulture and Life Science, Cheju National University) ;
  • Huh, Yoon-Hee (Department of Food Science and Engineering, Cheju National University) ;
  • Ko, Young-Hwan (Department of Food Science and Engineering, Cheju National University)
  • 김유경 (제주도농업기술원 농업환경과) ;
  • 고정삼 (제주대학교 원예생명과학부) ;
  • 허윤희 (제주대학교 식품공학과) ;
  • 고영환 (제주대학교 식품공학과)
  • Published : 1999.11.30

Abstract

Growth-inhibitory effects of citrus oils and agricultural fungicides, which were on the market, on several molds isolated from putrefied citrus fruits were investigated. When fungicidal activities of 11 kinds of synthetic agrochemicals against 6 species of molds, Alternaria alternata, Rhizopus sp., Botrytis cinerea, Monilia candida, Penicillium italicum and Penicillium digitatum, were investigated, agrochemicals containing mancozeb or fluazinam as an effective component had the broadest fungicidal spectrum. Agrochemicals containing iprodione, benomyl, azoxystrobin or thiophanate were less effective on the molds and those containing conazole derivative were intermediately effective. Resistance of the molds to the agrochemicals were species- and agrochemical-dependent. Among those molds tested, Penicillium italicum and Alternaria alternata showed relatively higher level of survival in the presence of synthetic fungicides. On the other hand, when the molds were exposed to citrus oils by direct contact, no cell could survive regardless of the species. The fungicidal activity of citrus oils was also confirmed by paper disk method and microscopic observation. These results suggested that citrus oils had broad killing activity against molds. Therefore, it would be necessary to design method for the application of citrus oils in order to improve post-harvest storage of citrus fruits.