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Photosystem II Inhibitor Resistance in the Columbia Basin of Washington State

  • John F. Spring (a1), Rick A. Boydston (a1) and Ian C. Burke (a2)


Weed management in potato and mint rely heavily on two Group 5 photosystem II–inhibiting herbicides, metribuzin and terbacil, respectively. Seed from weed escapes was collected in 2010 from 69 potato and mint production fields in Washington State and tested for resistance to metribuzin and terbacil. Of the seed screened, 26 of 51 Powell amaranth and redroot pigweed accessions and 8 of 23 common lambsquarters accessions tested expressed at least some degree of resistance to one or both herbicides. A Ser264Gly mutation in the chloroplast psbA gene was present in all but three resistant accessions. Herbicides with other mechanisms of action registered in potato and mint controlled all identified photosystem II–resistant accessions when applied at typical labeled rates.

El manejo de malezas en papa y menta depende fuertemente de metribuzin y terbacil, los cuales son dos herbicidas del Grupo 5 inhibidores del fotosistema II. Se colectó semilla de escapes de malezas en 2010 en 69 campos de producción de papa y menta en el estado de Washington y se evaluó la resistencia a metribuzin y terbacil. De las semillas evaluadas, 26 de 51 accesiones de Amaranthus powellii y Amaranthus retroflexus y 8 de 23 accesiones de Chenopodium album expresaron al menos algún grado de resistencia a uno o ambos herbicidas. Una mutación Ser264Gly en el gen psbA del cloroplasto estuvo presente en todas las accesiones excepto en tres. Los herbicidas con otros mecanismos de acción registrados en papa y menta controlaron todas las accesiones resistentes a la inhibición del fotosistema II cuando se aplicaron a las dosis típicas de la etiqueta.


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Associate Editor for this paper: Andrew Kniss, University of Wyoming.



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