highly significantP < 0.001
In the pooled analysis there was a highly significant main effect of cultivar on take-all infectivity measured as the percentage roots infected with take-all (P < 0.001) and no significant difference in the response of cultivars across the years and trial sites (Year.Trial.Cultivar P = 0.058, Table 2 , Supplementary Table S6b ), regardless of the different environmental and agronomic variables and the overall conduciveness of the sites to take-all build-up.