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Evaluation of Weed Management Programs and Response of FG72 Soybean to HPPD-Inhibiting Herbicides

  • John L. Schultz (a1), Michael Weber (a2), Jayla Allen (a3) and Kevin W. Bradley (a1)

Abstract

Field experiments were conducted at two locations in Missouri in 2012 and 2013 to evaluate herbicide programs in 4-hydroxyphenylpyruvate dioxygenase (HPPD)-inhibitor-resistant soybean, referred to as FG72 soybean, and their tolerance to four HPPD-inhibiting herbicides. At the Columbia location, PRE followed by (fb) POST and two-pass POST treatments provided 97% or greater control of all weeds except ivyleaf morningglory. At Moberly in 2012, PRE fb POST treatments provided 95% or greater control and 100% biomass reduction (BR) of glyphosate-resistant (GR) waterhemp, with the exception of isoxaflutole at 0.04 kg ha−1 plus S-metolachlor at 0.6 kg ha−1 plus metribuzin at 0.2 kg ha−1. In 2013, PRE fb POST treatments provided greater than 89% control and 93% BR. Two-pass POST treatments of isoxaflutole plus glyphosate always provided greater control and BR of GR waterhemp compared with glyphosate fb glyphosate. However, at Columbia, where glyphosate-susceptible weeds were present, there were no differences in control or BR between two-pass POST treatments. In the soybean tolerance experiment, isoxaflutole provided the lowest levels of injury. Applications of tembotrione at the 1× rate resulted in the greatest injury in both years. Topramezone at the 1× rate always provided less injury than tembotrione, but was always similar in BR. The 2× rates increased soybean injury over the 1× rate for the third trifoliate (V3) application, but not for the PRE and first-flower (R1) applications. V3 and R1 applications of isoxaflutole and mesotrione resulted in similar injury, height reduction, and BR to soybean 28 d after application in 2012 and 2013. Overall these results indicate that FG72 soybean could allow the use of HPPD-inhibiting herbicides such as mesotrione PRE along with isoxaflutole PRE and POST to provide an additional herbicide mechanism of action that was not previously available in soybean.

En 2012 y 2013, se realizaron experimentos de campo en dos localidades de Missouri para evaluar programas de herbicidas en soja resistente a inhibidores de 4-hydroxyphenylpyruvate dioxygenase (HPPD), llamada soja FG72, y su tolerancia a cuatro herbicidas inhibidores de HPPD. En la localidad de Columbia, tratamientos PRE seguidos por (fb) POST y tratamientos con dos aplicaciones POST brindaron 97% o más control de todas las malezas excepto Ipomoea hederacea. En Moberly en 2012, tratamientos PRE fb POST brindaron 95% o más control y 100% de reducción de la biomasa (BR) de Amaranthus rudis resistente a glyphosate (GR), con la excepción de isoxaflutole a 0.04 kg ha−1 más S-metolachlor a 0.6 kg ha−1 más metribuzin a 0.2 kg ha−1. En 2013, tratamientos PRE fb POST brindaron un control superior a 89% y 93% BR. Tratamientos con dos aplicaciones POST de isoxaflutole más glyphosate siempre brindaron mayor control y BR de A. rudis GR al compararse con glyphosate fb glyphosate. Sin embargo, en Columbia, donde malezas susceptibles a glyphosate estaban presentes, no hubo diferencias en el control o BR entre tratamientos con dos aplicaciones POST. En el experimento de tolerancia de la soja, isoxaflutole causó el menor nivel de daño. Aplicaciones de tembotrione a una dosis de 1× resultaron en el mayor daño en ambos años. Topramezone a una dosis de 1× siempre causó menor daño que tembotrione, pero BR fue siempre similar. Las dosis de 2× aumentaron el daño en la soja a niveles superiores que la dosis 1× para aplicaciones en la primera hoja trifoliada (V3), pero no para aplicaciones durante el inicio de la floración (R1). Aplicaciones en V3 y R1 de isoxaflutole y mesotrione resultaron en niveles similares de daño, reducción de altura, y BR de la soja 28 d después de la aplicación, en 2012 y 2013. En general, los resultados indican que la soja FG72 podría permitir el uso de herbicidas inhibidores de HPPD, tales como mesotrione PRE en conjunto con isoxaflutole PRE y POST para brindar un mecanismo de acción de herbicidas adicional que no estaba previamente disponible en soja.

Copyright

Corresponding author

Corresponding author's E-mail: bradleyke@missouri.edu.

References

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