Abstract
SummaryConventional methods indicated that Pythium violae was most commonly isolated from carrot cavity spot samples from 14 UK sites. For one site the most frequently isolated species was Pythium sulcatum. Results of similar isolation work were compared with the assay of cavity spot lesions using polyclonal antibodies, raised to P. violae or P. sulcatum, in competition ELISA. Where lesions were artificially induced the test confirmed which pathogen was causal. With cavities developed on the field‐grown carrots P. violae again predominated and the ELISA confirmed this. In one sample P. sulcatum was also isolated from a small number of lesions and was not detected in ELISA. The competition ELISA did not indicate presence of either Pythium in a range of non‐cavity spot lesions from which attempts at isolation were negative.
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