L. S. D. 0.5 to compare between means of different F1 populations =0.488 Also, results presented in Table (8) indicated that over dominance in yield was 1.26 in the cross Super strain B × NCEBR-6 trends to high yield. This result revealed that in screening plants to early blight disease, it appeared expressions of genes whereas, there are variations between parents. The F1 hybrids Peto-82 × NCEBR-6 and Edkawi × NCEBR-6 had slightly positive partial dominance (P = 0.23 and 0.20) from mid parent means trend to high parent Edkawi in total yield under greenhouse conditions. The NCEBR-6 is a genetic resource for early blight resistance. This study needs to test more isolates of the pathogen at controlled greenhouse environment to get more information about inheritance and genetic analysis for horizontal resistance and to obtain tomato cultivars with complete resistance to early blight disease.