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Title:   Author  item
                                            Grunwald, Niklaus

                                                         - *Nik*item
                                            CADENA HINOJOSA, M - INIFAP, MEXICOitem
                                            RUBIO COVARRUBIAS, O - INIFAP, MEXICOitem
                                            RIVERA PENA, A - INIFAP, MEXICOitem
                                            LOZOYA-SALDANA, H - PICTIPAPA, MEXICOitem
                                            Brown, Charlesitem
                                            FRY, W - CORNELL UNIV, NY
  Submitted to: American Journal of Potato Research
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 4/1/2003
                                    Publication  Date: 3/1/2004
                                    Citation: Grunwald, N.J., Cadena Hinojosa, M.A., Rubio Covarrubias, O., Rivera Pena, A., Lozoya-Saldana, H., Brown, C.R., Fry, W.E. 2004. Resistance in mexican potato germplasm to late blight is high and durable. American Journal of Potato Research.  81:61.Interpretive Summary:
                                Technical Abstract: The Mexican national potato program has produced several cultivars with high levels of field resistance.  We evaluated levels and durability of resistance to potato late blight of a selection of 12 such cultivars using data from 1960 to the present.  Most of these cultivars end up in less than 25% disease severity without a fungicide application.  Data for evaluating durability were extracted from the field notebooks located in the archives of the Mexican National Potato Program in the John S. Niederhauser Library in Toluca, Mexico.  There was a trend to indicate that field resistances to potato late blight of Mexican cultivars released between 1965-1999 is durable.  At least two of the cultivars, namely Sangema and Tollocan, have been grown on at least 4-5% of the potato acreage and over long periods of time without decay in levels of field resistance.  Pedigrees of the 12 cultivars indicate that most of the field resistance was introgressed from Solanum demissum and are available from the first author upon request.


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