Results presented in Table (7) indicated the relative potency of gene set (P) for the degree of resistance in comparison between three F1 hybrids. The (P) exhibited highly partial dominance in F1 hybrid Super strain × NCEBR-6 and the value has (0.74) a trend to the resistant parent. On the other side, there was negative complete dominance (-1) as for F1 hybrid as Edkawi × NCEBR-6 has a trend to the smaller parent, whereas there was no high differences between Edkawi and resistance parent. NCEBR-6 in the degree of resistance, in future breeding program needs more studies to choose right cultivars in combination between them resistance lines to get more progress against early blight. Marisa and Timothy (1990) reported that this situation complicates evaluation of resistance and progress toward release of early maturing resistant cultivars. Of the resistant breeding lines evaluated, NCEBR-2 has the greatest potential for future breeding of a resistant commercial cultivar.