Abstract
Removal of diseased plants (roguing) is commonly practiced in seed potato production. Diseased plants left to desiccate in fields could possibly serve as sources of Potato virus Y (PVY). PVY acquisition by three aphid species (Myzus persicae, Rhopalosiphum padi, Aphis fabae) was evaluated with leaflets from rogued plants for seven days. Results showed greater PVY acquisition rates in non-colonizing aphids species compared to colonizing ones. The proportion of aphids leaving leaflets increased with time (i.e. days after plants were uprooted) and some aphids were carrying PVY in their stylets on each of the seven days of the experiment, suggesting that aphids were able to probe and acquire PVY even when plants wilted. These results confirmed that diseased plants left in fields can serve as a source of PVY for aphids even after they wilted and emphasises that proper actions must be taken to efficiently remove diseased plants from fields.
Resumen
La eliminación de plantas enfermas (roguing en inglés), es una práctica común en la producción de semilla de papa. Las plantas enfermas dejadas en el campo para secarse pudieran posiblemente servir como fuentes del virus Y de la papa (PVY). Se evaluó la adquisición del PVY por tres especies de áfidos ((Myzus persicae, Rhopalosiphum padi, Aphis fabae) con hojas de plantas eliminadas durante siete días. Los resultados mostraron mayores niveles de adquisición de PVY en especies de áfidos no colonizadoras en comparación con las colonizadoras. La proporción de áfidos que abandonaron las hojas aumentó con el tiempo (i.e. días después de que las plantas fueron eliminadas) y algunos áfidos llevaban PVY en sus estiletes en cada uno de los siete días del experimento, lo cual sugiere que los áfidos fueron capaces de probar y adquirir PVY aun cuando las plantas se marchitaron. Estos resultados confirmaron que plantas enfermas dejadas en los campos pueden servir como fuente de PVY para los áfidos aun después de marchitarse, y pone énfasis en que se deben tomar acciones apropiadas para eliminar eficientemente plantas enfermas de los campos.



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Acknowledgments
The authors thank M.A. Giguère and C. Woodworth for their help by conducting the acquisition experiments and RNA extractions, respectively. Catherine Clark is also thanked for her critique and revision of the paper especially for English usage. This study was funded by the AgriInnovation Program of Agriculture and Agri-Food Canada and Comité Nord des Producteurs de Plants de Pommes de Terre – SIPRE, Achicourt, France.
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Boquel, S., Zhang, J. & Nie, X. How Long can Rogued Potato Plants Left in the Field Be a Source of Potato Virus Y for Aphids?. Am. J. Potato Res. 94, 81–87 (2017). https://doi.org/10.1007/s12230-016-9542-4
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DOI: https://doi.org/10.1007/s12230-016-9542-4