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KMID : 1160220230510040264
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Mycobiology
2023 Volume.51 No. 4 p.264 ~ p.272
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Identification of Fusarium Basal Rot Pathogens of Onion and Evaluation of Fungicides against the Pathogens
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Shin Jong-Hwan
Lee Ha-Kyoung
Back Chang-Gi
Kang Soo-Hyun
Han Ji-Won
Lee Seong-Chan
Han You-Kyoung
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Abstract
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Onion (Allium cepa L.) is an economically important vegetable crop worldwide. However,various fungal diseases, including Fusarium basal rot (FBR), neck rot, and white rot, reduceonion production or bulb storage life. FBR caused by Fusarium species is among the mostdestructive onion diseases. In this study, we identified Fusarium species associated with FBRin Jeolla and Gyeongsang Provinces in South Korea and evaluated fungicides against thepathogens. Our morphological and molecular analyses showed that FBR in onions is associatedwith Fusarium commune, Fusarium oxysporum, and Fusarium proliferatum. We selectedseven fungicides (fludioxonil, hexaconazole, mandestrobin, penthiopyrad, prochlorazmanganese,pydiflumetofen, and tebuconazole) and evaluated their inhibitory effects onmycelial growth of the pathogens at three different concentrations (0.01, 0.1, and 1mg/mL).
We found that prochloraz-manganese was highly effective, inhibiting 100% of the mycelialgrowth of the pathogens at all concentrations, followed by tebuconazole. Fludioxonilshowed < 50% inhibition at 1mg/mL for the tested isolates.
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KEYWORD
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Chemical control, fungicide, Fusarium basal rot, onion, pathogenicity
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