Table 1.

Analysis of variance for Karnal bunt reaction of 10 isolates of T. indica on a set of 10 host differential of T. aestivum.

Source of variation	Pathogenic variability
	Sum of Squares	Degree of Freedom	Mean Square	F value
Isolates (I)	3180.5	9	353.3	54.1**
Host genotypes (H)	511.3	9	56.8	8.7**
IXH	4856.8	81	59.9	9.1**
Residual	1291.9	198	6.5
Total	9840.7	299