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11 September 2018 Control of glyphosate-resistant waterhemp with preemergence herbicides in glyphosate- and dicamba-resistant soybean
Brittany K. Hedges, Nader Soltani, David C. Hooker, Darren E. Robinson, Peter H. Sikkema
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Abstract

Glyphosate-resistant (GR) waterhemp was first discovered in Ontario, Canada, in 2014. In Ontario, GR waterhemp interference in previous studies reduced soybean yield up to 73%. Tank-mixes of herbicides with multiple modes-of-action are important for delaying the evolution of herbicide resistance. The objective of this study was to evaluate the efficacy of pyroxasulfone (150 g a.i. ha-1), S-metolachlor/metribuzin (1943 g a.i. ha-1), pyroxasulfone/sulfentrazone (300 g a.i. ha-1), and pyroxasulfone/flumioxazin (240 g a.i. ha-1) applied preemergence (PRE) with and without the addition of glyphosate/dicamba (1800 g a.e. ha-1) for the control of GR waterhemp in soybean. At 8 wk after treatment application (WAA), glyphosate/dicamba applied PRE controlled GR waterhemp 45%. Pyroxasulfone, S-metolachlor/metribuzin, pyroxasulfone/sulfentrazone, and pyroxasulfone/flumioxazin applied PRE controlled GR waterhemp 79%, 87%, 91%, and 95%, respectively. At 2, 4, 8, and 12 WAA, the addition of glyphosate/dicamba to the aforementioned PRE herbicides did not improve GR waterhemp control. There was no increase in GR waterhemp control with the addition glyphosate/dicamba; however, multiple herbicide modes-of-action should be utilized to reduce the selection intensity for herbicide-resistant weeds.

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Brittany K. Hedges, Nader Soltani, David C. Hooker, Darren E. Robinson, and Peter H. Sikkema "Control of glyphosate-resistant waterhemp with preemergence herbicides in glyphosate- and dicamba-resistant soybean," Canadian Journal of Plant Science 99(1), 34-39, (11 September 2018). https://doi.org/10.1139/cjps-2018-0046
Received: 20 February 2018; Accepted: 11 July 2018; Published: 11 September 2018
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KEYWORDS
dicamba
glyphosate-resistance
preemergence
soybean
waterhemp
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