Relative frequency of species recovered from FDK in Manitoba, 2001 to 2008

These graphs illustrate the relative frequencies with which the main fungi isolated from FDK have been recovered from Manitoba in 2001 to 2008. As there is a considerable difference between crop districts within Saskatchewan and Alberta, the results from Saskatchewan in 1998 to 2008, and Alberta from 2002 to 2008, are now presented below. F. graminearum continues to be the species responsible for almost all the FDK in Manitoba. F. avenaceum was the primary species from Saskatchewan until 1997, when it was replaced by F. graminearum. Septoria nodorum has traditionally been the species most often isolated from the few FDK found in wheat from the central and northern areas of Alberta. This fungus is the causal agent of glume blotch, and although it is not a species of Fusarium, it can produce a kernel visually indistinguishable from those produced by the Fusariam causing FHB. In southern Alberta, the few FDK kernels found are typically infected by Fusarium spp. Other fungi were also found infecting FDK, and they varied in frequency from 3% to 31%. The most common of these fungi was Alternaria alternata. Other important members of this category were Apiospora montagnei, Asteromella spp., F. poae, F. sporotrichioides, and Nigrospora oryzae.