Is dicamba reducing the effectiveness of herbicides used in junglerice control?
15 December 2020
Last update: 15/12/20 10:24
Junglerice has become a significant problem in dicamba-resistant cotton and soybean crops. In Tennessee, for example, it is found in 76 percent of dicamba-resistant cotton fields and 64 percent of dicamba-resistant soybean fields. What’s more, growers have found the weed can escape applications involving two of the most common controls – dicamba plus glyphosate and/or clethodim.
A recent survey featured in the journal Weed Technology suggests that dicamba itself may contribute to junglerice plants escaping treatment. In a two-year study, researchers from the University of Tennessee found that glyphosate plus dicamba mixtures reduced junglerice control by 25 percentage points compared with glyphosate alone. Clethodim plus dicamba provided 6.5 percentage points less control than with clethodim alone.
Their conclusion: Dicamba is “antagonizing” the two herbicides and reducing their effectiveness in fighting junglerice.
Want to know more? The article “Survey of Glyphosate-Resistant Junglerice Accessions in Dicamba-Resistant Crops in Tennessee”, published in Weed Technology, is available free for a month.
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