Abstract
Two allelic mutations conferring high and low levels of in vitro tolerance to the fungicide methyl benzimidazole‐2‐ylcarbamate (MBC) were identified in the elm pathogen Ophiostoma ulmi. Variants expressing a third and intermediate level of tolerance were also identified. The locus for fungicide tolerance was linked to the mating type locus in both the aggressive and non‐aggressive strains of the fungus.
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