Bacterial wilt resistance of F₂, F₃, F₄ and F₅ generations was evaluated in tomato. Parents and each generation were transplanted into a field heavily infested with Pseudomonas solanacearum and inoculated with bacterial wilt. Bacterial wilt resistance was evaluated based on the date of plant death and a resistance index from 1 (susceptibility) to 13 (high resistance) was assigned to each plant. Mean resistance indices of the F₁ generations of the 2 crosses were 4.5 and 6.2, which were lower than the mid-parent values of 6.9 and 7.1, respectively. These findings suggest that bacterial wilt resistance is partially recessive as there was incomplete dominance toward susceptibility. There was no correlation between the resistance index and fruit weight in the F₂ generations of the 2 crosses (r = -0.074, r = -0.019), indicating that it is possible to select plants with both high resistance and large fruits in segregating populations. High parent-offspring correlation between the resistance indices of the parental F₂ plants and the resistance indices of the F₃ progenies was observed and the mean resistance indices of F₃, F₄ and F₅ progenies derived from highly resistant F₂, F₃ and F₄ plants were higher than the mean resistance indices of the progenies derived from susceptible or moderately resistant F₂, F₃ and F₄ plants. These findings indicate that selection of resistance in early generations is apparently effective.