AbstractThe effects of the sterol biosynthesis inhibitor (SBI) fungicides fenarimol, fenpropimorph, imazalil, prochloraz, propiconazole and triadimenol on growth and sterol composition ofUstilago maydis, Botrytis cinereaandPyrenophora teres, grown from spores or sporidia in liquid culture, were determined. Growth ofU. maydiswas only slightly inhibited by SBI fungicides at concentrations which caused considerable changes in both sterol content and composition. Conversely, inB. cinereaandP. teres, growth was strongly inhibited under conditions where ergosterol was still the predominant sterol, suggesting that, in these two fungi, growth may be more sensitive to SBI fungicides than overall sterol production. Demethylase inhibitor fungicides behaved as a homogeneous group in their effects on growth and on sterol profiles of the three fungi studied.
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