Or both cultivars. The square root transformation of PLACP displayed a bimodal distribution on both cultivars with one major peak and one minor peak (Fig. 1C, 1D). On Toronit, the majority of isolates displayed a lower level of virulence, forming a major peak at the post-transformation level of 
1 and a minor peak at the post-transformation level of 4. On 25033180 Greina, the major peak was shifted to the right at the posttransformation level of 5 while the minor peak was shifted to the left at the post-transformation level of 2. 20?0 colonies were formed on each plate and there was no systematic difference in the number of colonies formed between the plates supplemented and not supplemented with cyproconazole. Tolerance to cyproconazole ranged from 0.01?.30 with an average of 0.34. Six out of 141 (4 ) isolates grew better in the presence of cyproconazole than without the fungicide, resulting in values of fungicide tolerance larger than 1. Like PLACP, the natural logarithm of tolerance to cyproconazole within a pathogen population displayed a bimodal distribution with a major peak at the post-transformation level of 22.6 and a minor peak at the post-transformation level of 20.4 (Fig. 2).Comparison of cyproconazole tolerance and virulence among M. graminicola populationsIsolate and origin of isolate contributed significantly (p,0.0001) to cyproconazole tolerance, PLACL and PLACP. Cultivar also 
contributed significantly (p,0.0001) to PLACL and PLACP. Least significant difference analyses showed that the population from Switzerland displayed the highest levels of cyproconazole tolerance and virulence while the population from Australia displayed the lowest levels of cyproconazole tolerance and virulence (Table 1). The population from the resistant host Madsen displayed a higher cyproconazole tolerance and virulence than the population from the susceptible host Stephens (Table 1). All six isolates growing better in the presence of cyproconazole had a Swiss origin.Correlation between cyproconazole tolerance and virulence of M. graminicola isolatesThere were significant correlations between cyproconazole tolerance and PLACP on both ML-281 site Toronit (r91 = 0.21, p = 0.04 Fig. 3A) and Greina (r91 = 0.22, p = 0.03, Fig. 3B). The correlation coefficient between cyproconazole tolerance and PLACL on Toronit was positive and significant (r97 = 0.21, p = 0.04, Fig. 3C). Though the correlation coefficient between cyproconazole tolerance and PLACL on Greina was also positive, it was not significant (r98 = 0.13, p = 0.20, Fig. 3D), Variances and population means of cyproconazole tolerance and virulence were also positively associated, but none of them were significant (Fig. 4 5).Results Variation in PLACL, PLACP and cyproconazole tolerance in the Mycosphaerella graminicola populationsPLACLs ranged from 1?0 with an average (95 TA01 site confidence interval) of 26 (63 ) on the moderately resistant cultivar Toronit and from 1?0 with an average (95 confidence interval) of 39 (64 ) on the susceptible cultivar Greina, while PLACPs ranged from 0?0 with an average (95 confidence interval) of 9 (62 ) on Toronit and from 0?1 with an average (95 confidence interval) of 24 (63 ) on Greina, respectively. Frequency distributions of cyproconazole tolerance (natural logarithm transformed) and both PLACL and PLACP (square root transformed) were visualized by grouping isolates into 11, 10 and 13 bins differing by 0.56, 1.0 and 0.70 units, respectively. OurDiscussionWe assayed virulence.Or both cultivars. The square root transformation of PLACP displayed a bimodal distribution on both cultivars with one major peak and one minor peak (Fig. 1C, 1D). On Toronit, the majority of isolates displayed a lower level of virulence, forming a major peak at the post-transformation level of 1 and a minor peak at the post-transformation level of 4. On 25033180 Greina, the major peak was shifted to the right at the posttransformation level of 5 while the minor peak was shifted to the left at the post-transformation level of 2. 20?0 colonies were formed on each plate and there was no systematic difference in the number of colonies formed between the plates supplemented and not supplemented with cyproconazole. Tolerance to cyproconazole ranged from 0.01?.30 with an average of 0.34. Six out of 141 (4 ) isolates grew better in the presence of cyproconazole than without the fungicide, resulting in values of fungicide tolerance larger than 1. Like PLACP, the natural logarithm of tolerance to cyproconazole within a pathogen population displayed a bimodal distribution with a major peak at the post-transformation level of 22.6 and a minor peak at the post-transformation level of 20.4 (Fig. 2).Comparison of cyproconazole tolerance and virulence among M. graminicola populationsIsolate and origin of isolate contributed significantly (p,0.0001) to cyproconazole tolerance, PLACL and PLACP. Cultivar also contributed significantly (p,0.0001) to PLACL and PLACP. Least significant difference analyses showed that the population from Switzerland displayed the highest levels of cyproconazole tolerance and virulence while the population from Australia displayed the lowest levels of cyproconazole tolerance and virulence (Table 1). The population from the resistant host Madsen displayed a higher cyproconazole tolerance and virulence than the population from the susceptible host Stephens (Table 1). All six isolates growing better in the presence of cyproconazole had a Swiss origin.Correlation between cyproconazole tolerance and virulence of M. graminicola isolatesThere were significant correlations between cyproconazole tolerance and PLACP on both Toronit (r91 = 0.21, p = 0.04 Fig. 3A) and Greina (r91 = 0.22, p = 0.03, Fig. 3B). The correlation coefficient between cyproconazole tolerance and PLACL on Toronit was positive and significant (r97 = 0.21, p = 0.04, Fig. 3C). Though the correlation coefficient between cyproconazole tolerance and PLACL on Greina was also positive, it was not significant (r98 = 0.13, p = 0.20, Fig. 3D), Variances and population means of cyproconazole tolerance and virulence were also positively associated, but none of them were significant (Fig. 4 5).Results Variation in PLACL, PLACP and cyproconazole tolerance in the Mycosphaerella graminicola populationsPLACLs ranged from 1?0 with an average (95 confidence interval) of 26 (63 ) on the moderately resistant cultivar Toronit and from 1?0 with an average (95 confidence interval) of 39 (64 ) on the susceptible cultivar Greina, while PLACPs ranged from 0?0 with an average (95 confidence interval) of 9 (62 ) on Toronit and from 0?1 with an average (95 confidence interval) of 24 (63 ) on Greina, respectively. Frequency distributions of cyproconazole tolerance (natural logarithm transformed) and both PLACL and PLACP (square root transformed) were visualized by grouping isolates into 11, 10 and 13 bins differing by 0.56, 1.0 and 0.70 units, respectively. OurDiscussionWe assayed virulence.