Revista Chapingo Serie Horticultura
Universidad Autónoma Chapingo
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Vol.XXIII, núm.3 - 2017
Sensitivity to fungicides of Phytophthora infestans (Mont.) de Bary in Chapingo, Mexico
Sensibilidad a fungicidas del Phytophthora infestans (Mont.) de Bary en Chapingo, México Héctor Lozoya-Saldaña; Martha Nayeli Robledo-Esqueda; Patricia Rivas-Valencia; Sergio Sandoval-Islas; María Teresa Beryl Colinas y León; Cristian Nava-Díaz

Recibido: 2017-01-19

Aceptado: 2017-07-16

Fecha de publicación en línea: 2017-08-31 /pág.175-186


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  • descriptionAbstract

      Chemical control of plant diseases exerts high selection pressure for the development of pathogen resistance to fungicides. The objectives of this study were to quantify the existence  of late blight in Solanum tuberosum L., detect the presence of variants of the oomycete resistant to agrochemicals and compare the different levels of resistance in the isolates from one cycle to another. Plots of the potato cv. Fianna, susceptible to late blight (Phytophthora infestans [Mont] de Bary), were exposed to natural infection of the pathogen to detect the presence of variants of the oomycete resistant to the agrochemicals from one cycle to another, and from in vivo with respect to in vitro conditions, by applying a half dose of fungicides. The disease reached 100 % final foliar infection in treatments with ciazofamid in 2011 and with fosetyl-Al in 2012. On the other hand, mandipropamid allowed only 21-22 % infection in both years in the field. However, 49 % of the P. infestans population was susceptible, 39 % was intermediate, and 19 % was resistant to this product in vitro. Plots treated with fosetyl-Al reached 80-100 % infection in the field, while in vitro 88 and 46 % of the P. infestans populations showed intermediate resistance when exposed to high dosages of the product, and 62 % were resistant at low dosage. Isolates from field plots with natural infection exposed to ciazofamid were all sensitive in vitro. The inconsistencies of the oomycete regarding fungicide resistance/sensitivity under in vivo/in vitro conditions, as well from one year to another, do not support behavior predictability. These results expose the great genetic plasticity of the oomycete in relation to its sensitivity to fungicides.

    Keyworks: tizón tardío, papa, Solanum tuberosum, resistencia a fungicidas.

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  • starCite article

    Lozoya-Saldaña, H., Robledo-Esqueda, M. N.,  Rivas-Valencia, P., Sandoval-Islas, S., Beryl Colinas y León, M. T.,  &  Nava-Díaz, C. (2017).  Sensitivity to fungicides of Phytophthora infestans (Mont.) de Bary in Chapingo, Mexico. , XXIII(3), 175-186.

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