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Distribution of benzimidazole-resistant strains of the onion gray-mold neck rot pathogens,Botrytis aclada and Botrytis allii,in Hokkaido,Japan |
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| Authors: | Notsu Ayumi Shirai Kayo Kondo Norio |
| Institution: | 1.Central Agricultural Experiment Station, Hokkaido Research Organization, Naganuma, Hokkaido, 069-1395, Japan ;2.Tokachi Agricultural Experiment Station, Hokkaido Research Organization, Memuro, Hokkaido, 082-0081, Japan ;3.Research Faculty of Agriculture, Hokkaido University, Sapporo, 060-8589, Japan ; |
| Abstract: | Botrytis aclada and Botrytis allii, associated with onion gray-mold neck rot and isolated in Hokkaido, were tested for sensitivity to benzimidazole. Of the B. aclada strains, 59% were highly resistant and the remaining 41% were sensitive; all strains of B. allii were sensitive. Resistant strains were widespread in Hokkaido. We analyzed the sequences of the β-tubulin gene of resistant strains and detected the replacement of glutamic acid (GAG) by lysine (AAG) at codon 198. This is the first report of benzimidazole resistance in B. aclada. This study revealed a difference in fungicide sensitivity between the two Botrytis species. |
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