Commercial potato varieties and lines tolerant to bacterial wilt, Ralstonia solanacearum

摘要

The increasing demand for commercial potato varieties tolerant to bacterial wilt is the main concern of the government in catering to the seed needs of potato farmers. Varietal evaluations for bacterial wilt tolerance were conducted in pot trials under greenhouse conditions at the Northern Mindanao Integrated Agricultural Research Center (NOMIARC) bacterial wilt nursery and at three selected farm sites-Kibangay, Imbayao and Miarayon-all in the province of Bukidnon. Pot trials revealed that bacterial wilt infections were significantly different between the 18 varieties and 4 lines of potato. At 10~4 Ralstonia solanacearum colony counts, the highest infection was observed in cultivar Columbos and the lowest in the line NOMPO D. The most severe infection was observed in Sheepody variety, whereas the least infection was seen in the variety Granola and the line NOMPO E. At the bacterial wilt nursery, the top 10 varieties/lines that showed significant tolerance to bacterial wilt were NOMPO E, Granola, Atlantic, Igorota, NOMPO B, NOMPO D, Asterix, NOMPO A, Catani and Kennebec. The highest number of healthy tubers was harvested from Granola. The results of trials conducted at three farm sites revealed that bacterial wilt incidence varies with location. In Kibangay, the most severe bacterial wilt infection was found in Ranyag variety. Raja variety showed the lowest percentage infection, while the highest yield was obtained from line NOMPO B. In Imbayao, on the other hand, Igorota was the most severely infected. Ranyag showed the least infection and gave the highest yield. In Miarayon, the highest infection was observed in Asterix, while line NOMPO A gave the highest yield. The release to farmers of the tolerant varieties identified in this study should significantly increase their incomes and reduce their production costs.