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Research Shows Temperature, Glyphosate Increase Probability for Dicamba Volatility

Soybeans exhibit symptoms of dicamba injury. New research from the UT Institute of Agriculture suggests spraying dicamba in warm temperatures and adding glyphosate to a dicamba spray mixture could increase dicamba volatility, potentially leading to increased off-target movement and damage to non-tolerant plants. Photo by G. Rowsey, courtesy UTIA.

Soybeans exhibit symptoms of dicamba injury.  Photo by G. Rowsey, courtesy UTIA.

Higher temperatures and mixing glyphosate with dicamba lead to increased atmospheric concentrations of dicamba, according to scientists with the University of Tennessee Institute of Agriculture.

Tom Mueller and Larry Steckel, both professors in the UT Department of Plant Sciences, examined dicamba measurements following an application to soil inside a humidome. The dicamba formulations examined were diglycolamine (Clarity) and diglycolamine + VaporGrip (XtendiMax). Both formulations were applied as a mixture with glyphosate (Roundup PowerMax), and XtendiMax was also applied alone. Applications were made across a range of temperatures and monitored for 60 hours. Researchers then used air samplers to collect dicamba from the atmosphere within the humidome.

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