Rhynchosporium secalis

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Rhynchosporium secalis (Oudem.) J.J. Davis

Before 2011, this name has been mainly used for the closely related barley scald pathogen (Rhynchosporium commune). However R. secalis only causes leaf blotch (or scald) in rye and triticale (see Zaffarano et al., 2011 for taxonomical details). Both species are morphologically indistinguishable but can be separated genetically and by their host range.

The symptoms are similar to those of barley scald, consisting of oval lesions with a darker border. Conidia disperse by wind and rain and the disease is also seed-borne. R. secalis is widespread in temperate, rye growing regions, specially under cool and moist conditions. However, it is found less frequently than barley scald.