Measuring yield losses from off-target dicamba injury

LSU AgCenter weed science researchers testing model to help determine potential for yield loss from off-label dicamba spraying.

EPA received reports of off-label dicamba injury on more than 235,000 acres of cropland in 10 states in 2016 after growers were left with the unusual situation of having a herbicide-resistant trait approved for planting, but no label for the herbicide.

The subsequent illegal applications caused crop losses and tension between neighbors, but the problems were made worse because few growers could tell how much their crops would be affected by the off-label spraying.

Matthew Foster, graduate research assistant, LSU AgCenter, and Dr. Jim Griffin, retired professor of weed science at LSU, have been working on a system to help assign a yield loss to such applications. Foster discussed their research during the annual Louisiana Agricultural Technology and Management Conference in Marksville, La., this year.

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