AbstractThe strains ofBotrytis cinerea or Ustilago maydisselected on fenarimol, triarimol, or triadimefon were also resistant to the other inhibitors of sterol C‐14 demethylation; the sterol composition of the strains was normal. Among the isolates ofU. maydisresistant to dodemorph, fenpropidin, fenpropimorph and tridemorph, some were resistant to the 15‐azasteroid A 25822B and did not contain ergosterol. The other strains remained sensitive to A 25822B and had a normal sterol composition. All the resistant isolates and the wild‐type were inhibited to the same extent by nystatin and pima
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