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Integrated Pest & Crop Management



AUTHOR

Kevin Bradley
University of Missouri
Division of Plant Sciences
(573) 882-4039
bradleyke@missouri.edu

Update on Dicamba-related Injury Investigations and Estimates of Injured Soybean Acreage

Kevin Bradley
University of Missouri
(573) 882-4039
bradleyke@missouri.edu

Published: August 14, 2017

Several weeks ago we compiled information from many state Departments of Ag about the number of official dicamba-related cases that are currently under investigation in 2017, and also provided estimates from university weed scientists about the number of soybean acres injured in their respective states. In that article, Ag Industry, Do we have a problem yet?, we reported that there were 1,411 dicamba-related injury investigations being conducted and about 2.5 million acres of soybean estimated with dicamba injury. Because there was still a lot of spraying that was occurring in the Midwest at the time, those maps were out of date the moment they were published. In reality, we will likely not know the extent of dicamba damage until the end of the season, but Figures 1 and 2 provide some updated numbers as of August 10th. In comparison to the previous reports from just a few weeks ago, the number of cases under investigation in many states in the Midwest has at least doubled, and the soybean acreage estimated with dicamba injury has increased dramatically in many of these same locations.

U.S. state map of official dicama-related injury investigations as of August 10, 2017. With a total of 2,242 dicamba-related injury investigations nationally, 257 in Missouri.

Figure 1. Official dicamba-related injury investigations as reported by state departments of agriculture (as of August 10, 2017).

U.S. state map reporting estimated of dicama-injured soybean acerage as of August 10, 2017. With a total of about 3.1 million acres estimated damaged nationally, 325,000 in Missouri.

Figure 2. Estimates of dicamba-injured soybean acreage as reported by state extension weed scientists (as of August 10, 2017).

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REVISED: February 21, 2017