Bio-technology companies have developed cultivars of corn, soybean, and cotton with transgenic resistances to the synthetic auxin herbicides; 2,4-dichlorophenoxyacetic acid (2,4 D) and dicamba, which were slated for release in Mississippi for the 2015 and 2016 growing seasons. The introduction of new herbicide tolerant soybeans may provide many benefits for producers such as alternative control options for resistant weed species, decreased costs, and different modes of action. Along with these benefits, the use of auxin containing herbicides may also increase concern for issues such as herbicide drift, volatilization, and tank contamination. To combat these concerns Monsanto in collaboration with BASF (Dicamba-BAPMA) and Dow AgroSciences (2,4 D-choline) have developed new formulations that are less prone to volatilization and drift. Additionally these companies have created product stewardship programs. The Mississippi State Chemical Laboratory (MSCL) analyzes samples each year for off-target deposition of dicamba and 2,4 D, however, current-testing methods cannot differentiate between the amine, ester, or choline formulations. Therefore, our primary objective of this study was to determine the feasibility of using FT-IR technology to identify 2,4 D-choline and dicamba-BAPMA on field samples. Coupling FT-IR spectra to principal component analysis we have been able to separate and identify soybeans and cotton that were treated with dicamba-BAPMA and 2,4 D-choline from traditional formulations. The development of additional analytical testing methods will help to ensure an effective stewardship program.

FT-IR Testing method and stewardship for 2,4-D and dicamba resistant crops

254th National Meeting (2017)

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