Abstract
Surveys of the benzimidazole sensitivity of Rhynchosporium secalis isolates collected from winter barley crops throughout England, Wales and Northern Ireland were carried out in the early 1990s. In Northern Ireland, the frequency of highly benzimidazole-resistant strains increased significantly between 1990 and 1992, but did not change thereafter, having reached an equilibrium at about 40%. In England and Wales, 14 and 17% of isolates were resistant in 1992 and 1993, respectively. Differences in the frequency of carbendazim resistance were found for isolates from different cultivars. Carbendazim resistance was particularly prevalent in the wetter regions, more conducive to proliferation of R. secalis, but did not seem to be strongly correlated with levels of carbendazim use. In field trials carried out in various parts of the UK, carbendazim’s performance in controlling R. secalis was correlated weakly but significantly with the frequency of carbendazim-resistant strains of the pathogen.
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