The results presented in Table (5) showed significant differences among the different tomato genotypes under greenhouse for resistance degree to early blight where NCEBR-6 exhibited the highest degree of resistance (10) followed by cross Super Strain B × NCEBR-6 (9), the low values were found in Super Strain B (2.25) and Peto 82 (5.75) while their crosses which derived from them and NCEBR-6 were high resistance (9) and (8) respectively to Alternaria solani Calis and Topakya (2011) reported that none of tomato cultivars was fully resistance to early blight disease because all the tomato lines exhibited variable level of susceptibility from low to high incidence of necrotic spots on inoculated leaves