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MBC tolerance in aggressive and non‐aggressive isolates of Ceratocystis ulmi
Author(s) -
BRASIER C. M.,
GIBBS J. N.
Publication year - 1975
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1975.tb01626.x
Subject(s) - ceratocystis , biology , dutch elm disease , conidium , fungicide , botany , ophiostoma , horticulture , fungus
SUMMARY In selection experiments, tolerance to 0–5 ppm methyl benzimidazole‐2‐ylcarbamate (MBC) occurred at a frequency of c. 1 in 1–3 ×10 8 conidia in both aggressive and non‐aggressive isolates of Ceratocystis ulmi. The tolerant strains were inhibited by 5 ppm MBC, however, and attempts to select strains tolerant to 10 ppm were unsuccessful. In each of three isolates examined, tolerance remained stable after fifteen successive transfers on fungicide‐free medium. Genetic control was nuclear and probably conditioned by a single gene. It is thought unlikely that the appearance of tolerant strains in nature will jeopardize the use of MBC for the control of Dutch elm disease.