Abstract
In a remote mountainous region of the Philippines, farmers selected their own clones from hybrid True Potato Seed (TPS) populations and have maintained them for 30 years without public support. In 1985, the International Potato Center (CIP) initiated on-farm TPS research in the Mount Kanlaon area to help farmers control or reduce the rates of bacterial wilt caused by Ralstonia solanacearum. Seedlings were either grown in nursery beds or as transplants in the field. At harvest, farmers not only harvested their crop for either food or for sale but also selected their preferred clones. A survey conducted in 2016 showed that farmers are still growing potato clones selected from TPS and that these clones had spread to numerous areas within and around Mount Kanlaon. Farmers kept these clones because it was profitable because they required minimum inputs and their resistance to various pests and diseases and adverse weather conditions. ELISA tests showed that these clones have excellent virus resistance which partially explains why these clones have been growing for 30 years without a formal seed production program or any government support. Parents used to develop the TPS hybrids included those with virus and R. solanacearum resistance.
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