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1 January 2014 Simulated Glyphosate Drift to Potato Mother Plants and Effect on Daughter Tubers Used for Seed Production
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Abstract

Field trials were conducted to evaluate the effect of simulated glyphosate drift rates applied to two non-irrigated potato cultivars in the late tuber bulking stage grown for potato seed production. Mother plants receiving a sublethal glyphosate application had similar yields regardless of the year or cultivar. ‘Red LaSoda' seed pieces visually evaluated the following spring had more sprout inhibition from glyphosate-treated plots. With ‘Russet Burbank', only seed pieces from mother plants that received more than 18 g ha−1 glyphosate showed sprout inhibition. Total yield reductions the year following glyphosate treatments were attributed to fewer and smaller tubers from plants that did not emerge or were delayed in emergence. Red LaSoda seed pieces from mother plants receiving ≥ 71 g ha−1 glyphosate yielded less than the nontreated. In 2005, Russet Burbank seed pieces from mother plants receiving ≥35 g ha−1 glyphosate had reduced yields, whereas in 2006, all glyphosate treatments reduced total yield compared with the nontreated.

Nomenclature: Glyphosate; potato; Solanum tuberosum L. ‘Red LaSoda'; ‘Russet Burbank'; SOLTU.

Se realizaron estudios de campo para evaluar el efecto de la deriva simulada de dosis de glyphosate aplicadas en el estadio tardío de llenado de tubérculo a dos cultivares de papa sin riego, en papa producida para semilla. Plantas madre que recibieron aplicaciones de dosis subletales de glyphosate tuvieron rendimientos similares sin importar el año o el cultivar. Fragmentos de semilla de ‘Red LaSoda' provenientes de parcelas tratadas con glyphosate y evaluados visualmente en la primavera siguiente, tuvieron una mayor inhibición de rebrotes. Con ‘Russet Burbank', solamente los fragmentos de semilla de plantas madre que recibieron más de 18 g ha−1 de glyphosate mostraron inhibición de rebrotes. Las reducciones en el rendimiento total el año siguiente a los tratamientos con glyphosate fueron atribuidos a un menor número de tubérculos y tubérculos más pequeños provenientes de plantas que no emergieron o lo hicieron en forma retrasada. Los fragmentos de semillas de Red LaSoda provenientes de plantas madre que recibieron ≥71 g ha−1 de glyphosate rindieron menos que el testigo sin tratamiento. En 2005, los fragmentos de semilla de Russet Burbank provenientes de plantas madre que recibieron ≥35 g ha−1 de glyphosate redujeron su rendimiento, mientras que en 2006, todos los tratamientos con glyphosate redujeron su rendimiento total en comparación con el testigo sin tratamiento.

Harlene M. Hatterman-Valenti "Simulated Glyphosate Drift to Potato Mother Plants and Effect on Daughter Tubers Used for Seed Production," Weed Technology 28(1), (1 January 2014). https://doi.org/10.1614/WT-D-13-00107.1
Received: 23 June 2013; Accepted: 1 September 2013; Published: 1 January 2014
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