“…Whilst breeders have moved away from single source resistance to employing pyramided polygenic resistance (Thabuis et al, 2004;Reeves et al, 2013), longevity of newly deployed "resistant" cultivars remains dependent on the speed of isolate evolution and population adaptation (Moore et al, 2015;Mehmood et al, 2017). Accordingly, to assess this risk, variation in isolate aggressiveness has been assessed in many global regions including India (Vir and Grewal, 1974), the Palouse region of USA (Chen et al, 2004) Spain (Navas-Cortes et al, 1998), Pakistan (Jamil et al, 2000;Iqbal et al, 2004;Ali et al, 2012), Canada (Chongo et al, 2004), Syria (Atik et al, 2013;Imtiaz et al, 2015) and Australia (Mehmood et al, 2017).…”