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Responses of an HPPD Inhibitor-Resistant Waterhemp (Amaranthus tuberculatus) Population to Soil-Residual Herbicides

Published online by Cambridge University Press:  20 January 2017

Nicholas E. Hausman ,
Patrick J. Tranel ,
Dean E. Riechers ,
Douglas J. Maxwell ,
Lisa C. Gonzini  and
Aaron G. Hager
Nicholas E. Hausman
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Patrick J. Tranel
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Dean E. Riechers
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Douglas J. Maxwell
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Lisa C. Gonzini
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Aaron G. Hager*
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
*
Corresponding author's E-mail: [email protected]
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Abstract

Field experiments were conducted in 2010 and 2011 at a Mclean County, IL seed corn production field where resistance to foliar-applied 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitors was confirmed in waterhemp. Corn herbicides were applied to the soil at 1 and 2 times (1× and 2×, respectively) the recommended field use rate, while soybean herbicides were applied only at 1× the recommended rate. Waterhemp control and density were determined 30 and 60 d after treatment (DAT). In corn, 1× rates of mesotrione, safened and unsafened isoxaflutole formulations, atrazine, and S-metolachlor provided less than 70% control 30 DAT, while control with acetochlor was greater than 80%. One and 2× rates of acetochlor and 2× rates of mesotrione and unsafened isoxaflutole provided the greatest reduction of waterhemp density across years. At 30 DAT in soybean, sulfentrazone, flumioxazin, metribuzin, and pyroxasulfone provided the highest levels of waterhemp control (84 to 92%), as well as the greatest reduction in waterhemp density both years. A dose–response experiment with soil-applied mesotrione was performed under controlled greenhouse conditions using three waterhemp populations: MCR15 (seed collected from the McLean Co. site), NH41 (progeny obtained from the McLean Co. population by an additional generation of mesotrione selection in the greenhouse), and a sensitive (S). Emergence counts 21 DAT revealed higher seedling survival of MCR15 and NH41 at mesotrione rates of 105 g ha−1 or less compared with the sensitive control. Resistant-to-sensitive (R/S) ratios for NH41 and MCR15 were 12.7 and 8.8, respectively. Field results indicate the McLean Co. waterhemp population demonstrates reduced sensitivity to soil-applied HPPD-inhibiting herbicides. This is supported by greenhouse results that demonstrate reduced sensitivity to mesotrione in MCR15 and NH41.

En 2010 y 2011, se realizaron experimentos de campo en el condado McLean, IL, en un campo de producción de maíz para semilla donde se confirmó que había Amaranthus tuberculatus con resistencia a herbicidas de aplicación foliar inhibidores de 4-hydroxyphenulpyruvate dioxygenase (HPPS). Herbicidas para maíz fueron aplicados al suelo a 1 y 2 veces (1× y 2×, respectivamente) las dosis recomendadas de campo, mientras que herbicidas para soya fueron aplicados solamente a la dosis recomendada 1×. El control y la densidad de A. tuberculatus fueron determinados 30 y 60 d después del tratamiento (DAT). En maíz, dosis 1× de mesotrione, isoxaflutole en formulaciones con o sin antídoto, atrazine, y S-metolachlor brindaron menos de 70% de control a 30 DAT, mientras que el control con acetochlor fue superior al 80%. Las dosis de 1 y 2× de acetochlor y las dosis 2× de mesotrione e isoxaflutole sin antídoto brindaron la mayor reducción en la densidad de A. tuberculatus en los dos años. A 30 DAT en soya, sulfentrazone, flumioxazin, metribuzin, y pyroxasulfone brindaron los mayores niveles de control de A. tuberculatus (84 a 92%), además de la mayor reducción en las densidades de esta maleza en ambos años. Se realizó un experimento de respuesta a dosis con mesotrione aplicado al suelo bajo condiciones controladas en invernadero, usando tres poblaciones de A. tuberculatus: MCR15 (semilla colectada en la localidad del condado McLean), NH41 (progenie obtenida de la población del condado McLean después de una generación adicional seleccionada con mesotrione en el invernadero), y una sensible (S). Conteos de emergencia revelaron mayor supervivencia de las plántulas de MCR15 y NH41 a dosis de 105 g ha−1 o menores al compararse con el testigo sensible. Las proporciones de resistente a sensible fueron 12.7 y 8.8 para NH41 y MCR15, respectivamente. Los resultados de campo indican que la población de A. tuberculatus del condado McLean mostró sensibilidad reducida a herbicidas aplicados al suelo inhibidores de HPPD. Esto fue apoyado por los resultados de invernadero que mostraron una sensibilidad reducida a mesotrione en MCR15 y NH41.

Keywords

AcetochloratrazineflumioxazinisoxaflutolemesotrionemetribuzinpyroxasulfoneS-metolachlorsulfentrazonewaterhemp, Amaranthus tuberculatus (Moq.) Sauer var. rudis (Sauer) Costea and Tardif AMATUcorn, Zea mays L.soybean, Glycine max (L.) MerrHerbicide resistancesoil-applied dose–responsewaterhemp management
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 27 , Issue 4 , December 2013 , pp. 704 - 711
Copyright
Copyright © Weed Science Society of America 

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