The Plant Pathology Journal
- Volume 17 Issue 3
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- Pages.141-148
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- 2001
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- 2093-9280(eISSN)
Occurrence and Biological Control of Postharvest Decay in Onion Caused by Fungi
- Lee, Joon-Taek (Department of Agricultural Biology, Genetic Engineering Institute, Gyeongsang National University) ;
- Bae, Dong-Won (Central Laboratory, Gyeongsang National University) ;
- Park, Seun-Hee (Department of Agricultural Biology, Genetic Engineering Institute, Gyeongsang National University) ;
- Shim, Chang-Ki (Department of Agricultural Biology, Genetic Engineering Institute, Gyeongsang National University) ;
- Kwak, Youn-Sig (Kumho Life, Environmental Science Laboratory) ;
- Kim, Hee-Kyu (Department of Agricultural Biology, Genetic Engineering Institute, Gyeongsang National University)
- Published : 2001.06.01
Abstract
Postharvest decay of onion bulbs was examined by inspecting the commercial packages in the market or in storage. Bulb rot incidence was unexpectedly high, and onion bulbs with 1st quality grade were rotten most severely by 51%, followed by 32% for 2nd and 21% for 3rd grades. This indicates that larger bulbs had higher incidences of bulb rots. Major pathogens associated with basal and neck rots were Fusarium oxysporum and Aspergillus sp. or Botrytis allii, respectively, of which basal rot was most prevalent and damaging during storage. Among the epiphytic microorgani는 from onion plants, several Bacillus and Paenibacillus spp. and previously selected Pseudomonas putida and Trichoderma harzianum had inhibitory efficacy against bulb rot pathogens. Among these B. amyloliquefaciens BL-3, Paenibacillus polymyxa BL-4, and P. putida Cha 94 were highly inhibitory to conidial germination of F. oxysporum and B. allii. P. putida Cha 94, B. amyloliquefaciens BL-3, P. polymyxa BL-4, and T. harzianum TM were applied in the rhizoplane of onion at transplanting. Initially antagonist populations decreased rapidly during the first one month. However, among these antagonists, rhizoplane population densities of BL-3, Cha 94, and TM were consistently high thereafter, maintaining about 10