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Resistance of potato to powdery scab (Spongospora subterranea) under andean field conditions

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Abstract

Six field trials were carried out in naturally infested soil to identify resistance to powdery scab. Trials were conducted at Anta, Cusco, in southern Peru (3300 m altitude) during six seasons. A scale of 1 (0%) to 9 (>95%) of tuber surface showing infection was used to evaluate resistance. Ratings 1–3 were considered resistant (R), 4 moderately resistant (R) and 5 or more, susceptible (S). Among 467 tested potato accessions (cultivars and advanced clones) of the potato germplasm collection held at the International Potato Center (CIP), 17 were R and 33 MR during two or more seasons. Another 55 were R and 70 MR during only one season. In addition, 251 were S and 41 did not grow for different reasons. Resistant were G-6, LT-6, DGV-103 A, Santiaguina, Alka Pinu, G84270.4, Serrana INTA, Esperanza, Gabriela, Albina, Primicia INTA, Pentland Crown, Ultimus, Katahdin, DTO-28, AL-624, and G81422.6. Cultivars Gabriela and Albina and clone G81422.6 can now be used by Cusco farmers because of their high yield, adaptability, and good resistance to powdery scab.

Compendio

Seis ensayos de campo fueron conducidos en suelo naturalmente infestado para identificar resistencia a roña. Los ensayos fueron conducidos en Anta, Cusco, al sur de Perú (3300 m de altitud) durante seis campañas. Para evaluar la resistencia se utilizó una escala de 1 (0%) a 9 (>95%) de la superficie del tubℰculo mostrando infección. Los grados 1 a 3 fueron considerados resistentes (R), 4 moderadamente resistentes (MR) y 5 o más susceptibles (S). Entre 467 accesiones de papa (cultivares y clones avanzados) de la colección del germoplasma de papa, mantenido por el Centro Internacional de la Papa (CIP), 17 fueron R y 33 MR durante dos o mas campanas. Otros 55 fueron R y 70 MR durante una sola campaña. Además, 251 fueron susceptibles y 41 no crecieron por diferentes razones. Los cultivares y clones avanzados resistentes fueron G-6, LT-6, DGV-103 A, Santiaguina, Alka Pinu, G84270.4, Serrana INTA, Esperanza, Gabriela, Albina, Primicia INTA, Pentland Crown, Ultimus, Katahdin, DTO-28, AL-624y G81422.6. Los cultivares GabrielayAlbinay el clon avanzado G81422.6 pueden ser ahora utilizados por los agricultures del Cusco, porque tienen alto rendimiento, adaptabilidad y buena resistencia a roña.

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Authors and Affiliations

  1. International Potato Center (CIP), 1558 Lima, Apartado, Peru

    H. Torres & E. R. French

  2. “Andenes” Experimental Station, INIAA-Cusco, Peru

    M. A. Pacheco

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  1. H. Torres
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  2. M. A. Pacheco
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  3. E. R. French
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Torres, H., Pacheco, M.A. & French, E.R. Resistance of potato to powdery scab (Spongospora subterranea) under andean field conditions. American Potato Journal 72, 355–363 (1995). https://doi.org/10.1007/BF02849332

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