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Three Korean cultivars, Pungkak, Kalmi, and Subi, were crossed with PI 201234, which has resistance to P. capsici. A backcross breeding program was initiated to incorporate the Phytophthora resistance into the Korean cultivars, but the level of resistance decreased as the backcross round increased. Highly resistant plants occurred frequently in the BC1F2 populations but were rare in the BC2F1 populations. Resistant plants selected in BC1F3 populations had nearly enough recovery of the growth and fruit characteristics of the Korean recurrent parents. Crosses were made between resistant selections in each BC1F2 population. The F1 hybrids showed a considerably increased level of resistance.
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