Physiologic specialization of Puccinia triticina , the causal agent of wheat leaf rust, in Canada in 2015–2019

Table 2. Frequency (%) of virulence to 17 Thatcher near isogenic wheat lines with different leaf rust resistance genes

Table 3. Frequency and distribution of virulence phenotypes of Puccinia triticina identified in Manitoba and Saskatchewan from 2015 to 2019 by infection types to selected resistance genes

Fig. 1 Frequency of virulence (%) from 2002–2019^a in the Manitoba and Saskatchewan population of P. triticina to near-isogenic lines containing Lr2a, Lr9, Lr16, Lr24, Lr17 or Lr21.

^aData from McCallum and Seto-Goh (Citation2003, Citation2004, Citation2005, Citation2006a, Citation2006b, Citation2008, Citation2009) and McCallum et al. (Citation2010, Citation2011, Citation2013, Citation2016c, Citation2017b, Citation2018b, Citation2020b, Citation2020c).

Table 4. Frequency and distribution of virulence phenotypes of Puccinia triticina identified in Ontario from 2015 to 2019 by infection types to selected resistance genes

Table 5. Frequency and distribution of virulence phenotypes of Puccinia triticina identified in Quebec from 2015 to 2019 by infection types to selected resistance genes

Table 6. Frequency (%) of virulence for a sub-set of isolates selected to represent the virulence phenotypes found annually to 17 additional Thatcher near isogenic wheat lines with different resistance genes to leaf rust

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