The fungicide iprodione and the heterocyclic anilide E-0858 were compared with benomyl for in vitro inhibition of mycelial growth of Monilinia laxa and M. fruticola, for suppression of anther infection of blossoms in the laboratory, and for control of brown rot blossom and twig blight in the field. All 100 isolates of M. laxa obtained from an orchard in Solano County, California, were sensitive to benomyl (no growth at 1.0 μg a.i/ml), whereas all 100 isolates from an orchard in Fresno County, California, were resistant to benomyl (growth at 1.0 μg a.i./ml). Effective concentrations (EC 50 ) of benomyl in Czapek's medium for inhibition of mycelial growth of M. laxa or M. fructicola averaged 0.09 μg/ml for sensitive isolates and 0.77 μg/ml for resistant isolates [...]
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Juan M. Osorio (1994) studied this question.