Browsing by Autor "Javier Franco-Ponce"

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    Morphology and DNA sequence data reveal the presence of Globodera ellingtonae in the Andean region
    (Naturalis Biodiversity Center, 2014) Paola Lax; Juan C. Rondan Dueñas; Javier Franco-Ponce; Cristina N. Gardenal; Marcelo E. Doucet
    Potato cyst nematodes, G . rostochiensis and G . pallida , are the most economically important nematode pests of potatoes worldwide and are subject to strict quarantine regulations in many countries. Globodera ellingtonae was recently described from Oregon (USA), with its host-plant in the field being still unknown. Roots of Andean potatoes from the North of Argentina have been found attacked by this nematode, providing further evidence that this is a potato cyst nematode species, along with G . pallida and G . rostochiensis . New information about morphological, biological and molecular aspects of G . ellingtonae is provided for diagnostic purposes. The Argentine population showed morphological differences from specimens from Oregon; therefore, new diagnostic characters were defined to differentiate G . ellingtonae from its closest species. The Hsp90 gene was shown to be a good diagnostic marker for discriminating the three PCN species. The importance of the detection of G . ellingtonae on potatoes in the Andean region is not restricted to a regional level, since the nematode is also present in USA. This species can pose a serious problem to potato crop, especially when infected tubers are used as seeds. The distribution in the South American Andes is likely to extend the currently known distribution areas because cysts are passively transported. There is a need to evaluate the possible damage it may cause to potato crops. Morphological and molecular diagnoses conducted in this work provide fundamental information for the protection of potato crops not only in those countries in the Americas where the species has already been detected, but also worldwide.
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    Pérdidas causadas por el nematodo Quiste de la papa (Globodera sp.) en Bolivia y Perú
    (2016) Javier Franco-Ponce; A. González-Verástegui
    Las pérdidas económicas causadas por Globodera sp. en Bolivia y Perú se estimaron en base a información documentada disponible sobre su distribución (incidencia) y pérdidas en el rendimiento (severidad) del cultivo de papa. Se determinó que Globodera sp. está presente en diferentes niveles de infestación en todos los departamentos andinos de ambos países. La extrapolación de áreas cultivadas, incidencia, severidad de daño y precio de venta de los tubérculos, mostraron que las pérdidas económicas en el valor bruto de la producción de papa en Bolivia y Perú alcanzan a US$ 13’000,000 y US$ 128`000,000, respectivamente. La especie dominante en el Perú es G. pallida y G. rostochiensis en Bolivia, aun cuando en este último se encontraron poblaciones con ambas especies. Globodera sp. fue más frecuente entre los 3,500 y 4,000 msnm.Aceptado para publicación: Diciembre 28, 2011