About Sterol Biosynthesis Inhibitors According to mode of action these sterol inhibiting fungicides are divided into 2 groups: (1). Inhibitors of sterol C-14 demethylation (DMIs). (2). Group which interfere with the C-14 reductase. (1). Inhibitors of sterol C-14 demethylation (DMIs) which affect cytochrome P-450 enzymes. This group includes pyrimidines (fenarimol, nuarimol, etc.), imidazoles (prochloraz), triazoles…
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