Combining resistance tomeloidogyne incognita,M. javanica,M. arenaria andPseudomonas solanacearum in potatoes

The objectives of this study were to combine and increase the frequency of resistance to root-knot and bacterial wilt in potatoes.Solanum sparsipilum was used as the source of resistance toMeloidogyne incognita, M. javanica, M. arenaria, andPseudomonas solanacearum. Neo-tuberosum clones into which bacterial wilt resistance fromSolanum phureja had been transferred were also used. It was possible to transfer the resistance to the three species of root-knot fromS. sparsipilum to the Neo-tuberosum population. Two cycles of selection were made and the percentage of clones resistant toP. solanacearum in the last cycle was 16% over the previous cycle. All the clones resistant toM. arenaria were resistant toM. incognita andM. javanica. Two groups of selected clones were formed. Clones in both groups are resistant to root-knot and bacterial wilt. In one of them the two sources of resistance toP. solanacearum have been combined.