Identification of Fusarium Basal Rot Pathogens of Onion and Evaluation of Fungicides against the Pathogens
Jong-Hwan Shin,
Ha-Kyoung Lee,
Chang-Gi Back,
Soo-hyun Kang,
Ji-won Han,
Seong-Chan Lee,
You-Kyoung Han
Affiliations
Jong-Hwan Shin
Horticultural and Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, Rural Development Administration, Wanju, Republic of Korea
Ha-Kyoung Lee
Horticultural and Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, Rural Development Administration, Wanju, Republic of Korea
Chang-Gi Back
Horticultural and Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, Rural Development Administration, Wanju, Republic of Korea
Soo-hyun Kang
Allium Vegetables Research Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration, Muan, Republic of Korea
Ji-won Han
Allium Vegetables Research Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration, Muan, Republic of Korea
Seong-Chan Lee
Horticultural and Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, Rural Development Administration, Wanju, Republic of Korea
You-Kyoung Han
Horticultural and Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, Rural Development Administration, Wanju, Republic of Korea
AbstractOnion (Allium cepa L.) is an economically important vegetable crop worldwide. However, various fungal diseases, including Fusarium basal rot (FBR), neck rot, and white rot, reduce onion production or bulb storage life. FBR caused by Fusarium species is among the most destructive onion diseases. In this study, we identified Fusarium species associated with FBR in Jeolla and Gyeongsang Provinces in South Korea and evaluated fungicides against the pathogens. Our morphological and molecular analyses showed that FBR in onions is associated with Fusarium commune, Fusarium oxysporum, and Fusarium proliferatum. We selected seven fungicides (fludioxonil, hexaconazole, mandestrobin, penthiopyrad, prochloraz-manganese, pydiflumetofen, and tebuconazole) and evaluated their inhibitory effects on mycelial growth of the pathogens at three different concentrations (0.01, 0.1, and 1 mg/mL). We found that prochloraz-manganese was highly effective, inhibiting 100% of the mycelial growth of the pathogens at all concentrations, followed by tebuconazole. Fludioxonil showed < 50% inhibition at 1 mg/mL for the tested isolates.
