Sensitivity of Pseudoeevcosporella herpotriehoides to the fungicide prochloraz

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Abstract
In a survey carried out in 1984, isolates of the eyespot fungus, Pseudocercosporella herpotrichoides, from cereals in the UK, Denmark and West Germany were tested in vitro for sensitivity to the fungicide prochloraz. Of 194 isolates tested, 191 showed no growth on agar amended with prochloraz at 2 μg/ml or more. The mean concentration of prochloraz calculated to inhibit colony growth by 50% (IG50) was 0 44+0−010 μg/ml. The three isolates that grew at 2 μg/ml displayed weak colony development and were clearly disrupted by the presence of the fungicide. R‐type isolates appeared more sensitive to prochloraz than W‐type isolates. Comparisons with similar data for isolates obtained from other years revealed no consistent change with time in sensitivity to prochloraz.