Reduced sensitivity of Botrytis cinerea to two sterol biosynthesis‐inhibiting fungicides: fenetrazole and fenethanil

摘要: Isolates of Botrytis cinerea having reduced sensitivity to the sterol biosynthesis-inhibiting (SBI) fungicides fenetrazole and fenethanil were obtained from one out four sites which isolates tested. Reduced was associated with poor disease control by fenetrazole, had been applied dichlofluanid. Conidial germination hyphal growth B. tested in vitro on media amended fungicides. Following or treatment, at site where failed, populations detected higher EC50 EC90 values than three other sites. Germination conidia markedly inhibited 1.0 μg/ml 0.5–1.0 fenethanil. The frequency insensitive 0.5 3.4 1.8 times higher, respectively, compared another SBI never grey mould. Grey mould caused selected expressed phenotype low leaves tomato, pepper Senecio cineraria not controlled either (1 .5–3.0 μg/ml). However, up 100% reduction when infected sensitive treated