Effect of hosts on competition among clones and evidence of differential selection between pathogenic and saprophytic phases in experimental populations of the wheat pathogen Phaeosphaeria nodorum

Table 4 Contingency χ² tests for differences in genotype frequencies between Phaeosphaeria nodorum collections made from the same host treatment at different sampling times.

	Pair-wise comparisons			Multi-population comparisons
	2004A vs. 2004B	2004B vs. 2005A	2004A vs. 2005A
Levis	10.16 (7)	25.02 (8)***	17.50 (7) **	32.37 (16) **
Runal	16.28 (7)*	10.82 (6)	11.82 (7)	24.95 (14)*
Mixture	10.87 (7)	10.97 (8)	10.38 (6)	18.26 (16)
Tamaro	17.80 (8)*	17.25 (7)**	15.87 (8) *	30. 13 (16)*
Tirone	15.80 (8)*	15.60 (8)*	19.54 (8) **	31.64 (16) **

Values in bold font are significant after Bonferroni correction at a global alpha of 0.05 (p-value of 0.05/15 = 0.0032) and values in parenthesis are degrees of freedom. A Bonferroni correction was not applied for the multi-population analysis.
* Significant at p = 0.05 before Bonferroni correction
** Significant at p = 0.01 before Bonferroni correction
*** Significant at p = 0.001 before Bonferroni correction

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