Abstract
Two methods were compared for monitoring the sensitivity of eyespot (Pseudocercosporella herpotrichoides) from wheat fields to MBC-type fungicides. Resistant isolates were detected by their growth on agar containing 1 μg/ml carbendazim; the use of mycelium or conidia gave similar results. From wheat fields which had never received MBC, 1–4 % of eyespot lesions yielded resistant isolates, whereas 65 % of lesions were resistant where these fungicides had been used. Resistant and sensitive isolates were equally pathogenic and both were inhibited by prochloraz. Only carbendazim resistant isolates were sensitive to methyl N-(3,5-dichlorophenyl)-carbamate.
Published Version
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