New pathogenic group of Rhynchosporium secalis (the cause of barley leaf blotch) in Mexico
DOI:
https://doi.org/10.33885/sf.1983.2.586Abstract
The action of Rhynchosporium secalis (Oud.) Davis in 14 barley varieties waj
studied. The inoculum was taken from the var. Porvenir of the Mexican Valley. The
reaction of the fungus in the differential plants did not correspond to any of the
pathogenic groups previously reported in México. The conclusión of this work is
that ¡t may correspond to a sixth pathogenic group in México, although the variability
of the fungus is so big that we prefer not to take it as a new race. The resistant
genes for this pathogenic group were rhgrhs, rh7rh7, RhgRhg, Rh4Rh4, a
recesive gene of the variety Trebi, and the not identified genes of var. Chevalier
and Larquer.
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