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Late blight resistance of five Mexican potato cultivars in the eastern Sierra of the state of Mexico

TitleLate blight resistance of five Mexican potato cultivars in the eastern Sierra of the state of Mexico
Publication TypeJournal Article
2007
AuthorsCadena-Hinojosa, MA, Diaz-Valasis, M, Guzman-Plazola, RA, Fernandez-Pavia, SP, Grünwald, NJ
JournalAmerican Journal of Potato Research
Volume84
Pagination385-392
Date PublishedSep-Oct
1099-209X
ISI:000251761100003
diseases, durable resistance, field-resistance, fungicide, general resistance, horizontal resistance, host-resistance, integration, intraracial variation, phytophthora infestans, phytophthora-infestans populations, polygenic resistance, r-genes, race non-specific resistance, race-specific, resistance, solanum tubarosum, vertical resistance

cultivated potato areas as well as potential regions for commercial production and seed production. Prevailing weather conditions during the summer in these regions are also favorable for potato late blight disease (Phytophthora infestans (Mont) De Bary). The objectives of this work were to evaluate five resistant cultivars versus a susceptible control ('Alpha') in the eastern sierra of the State of Mexico in order to assess resistance against the disease.Environmental conditions for potato late blight were favorable all five years of the study, and at the end of each growing cycle, Alpha had 100% of late blight severity. Cultivars Montserrat, Michoacan, Nortena and Sangema (Rosita) showed acceptable disease resistance. Disease severity on the resistant varieties varied from 2% to 20%. There was a delay of two to eight weeks in the appearance of the first symptoms in relation to Alpha cultivar. These delays were four to five times greater than the ones observed at the Toluca Valley in previous experiments. Yield varied from 94 to 1,475 g per plant and was related to resistance to late blight. This work corroborates potato late blight resistance observed by INIFAP and CEEM scientists at the Toluca Valley. The expression of resistance is considered to be of great help in controlling the disease with a lower number of fungicide applications and better profit. In addition, using these varieties and therefore reducing the number of fungicide sprays also reduces direct damage to people and the environment.

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