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Figure S1. Relationship between infectivity in the main experiment and in the additional experiment, shown for individual PST isolates at 10 and 20°C.

Figure S2. Mean difference (±SE) in infectivity between Southern and Northern isolates in the additional experiment, shown for two temperatures (10 and 20°C).

Figure S3. Mean difference (±SE) in infectivity between Southern and Northern isolates in the additional experiment, shown for two temperatures (10 and 20°C) and for different durum wheat and bread wheat cultivars.

Figure S4. Relationship between germination rates in the main experiment and in the additional experiment, shown for individual PST isolates at 10 and 20°C.

Figure S5. Mean (±SE) difference in germination rate between Southern and Northern isolates at 10 and 20°C, as measured in the main experiment (dark grey circles) and additional experiment (light grey circles).

Figure S6. Time to sporulation (latency time) and spore production of Northern and Southern PST isolates, on the Victo host cultivar.

Figure S7. Correlation between mean proportion of vir8 isolates in initial vir8/Avir8 spore mixture and estimated vir8 frequency, as measured on the cultivar Compare (Yr8).

Figure S8. Infectivity curves of the eight isolates used in field competitions, fitted to the observed values (A: Acalou cultivar, B: Victo cultivar), using a beta function.

Figure S9. Time course of predicted daily differences in infectivity (black lines) between competing Southern and Northern isolates in the field experiment in each year (2005, 2006) and location (North, South), as illustrated for one selected pair of isolates in each panel.

Table S1. Characteristics of 17 isolates of Puccinia striiformis f.sp. tritici used in this study.

Table S2. Analysis of covariance of infectivity in the additional replicate experiment, testing effects of pathogen isolate, temperature (10 vs 20°C) and infectivity in the main experiment (covariate); all other interactions (P > 0.8) removed from model.

Table S3. Analysis of variance of infectivity, testing effects of temperature (10 vs 20°C), pathogen origin (North versus South), identity of pathogen isolate and replicate experiment.

Table S4. Analyses of variance of infectivity in additional replicate experiments, testing effects of pathogen origin (North versus South), identity of pathogen isolate and host cultivar, at two incubation temperatures (10, 20°C).

Table S5. ancova of germination rate in additional replicate experiments, as a function of pathogen isolate, temperature (10 vs 20°C) and germination rate in main experiments (=covariate).

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