Recently there has been increased buzz about alleged negative interactions of glyphosate with micronutrients and plant diseases. To date there are many sources of information about this topic in both scientific papers and the popular press. Bob Hartzler from Iowa State University has done a very thorough literature review and discussion of this topic that he presented at the 2010 ISU Integrated Crop Management Conference (Ames, IA). His conclusion from that presentation and the paper he presented were that although these interactions cannot be completely ruled out, there is no data to suggest that there is widespread negative impact on micronutrients or plant diseases.
Purdue University has also published a paper that discusses glyphosate’s impact on field crop production and disease development. In this paper by Purdue University they state “the claims that glyphosate is having a widespread effect on plant health are largely unsubstantiated.” They go on to state “Most importantly, the impact of these interactions on yield has not been demonstrated.” Based on the opinion of Iowa State University and Purdue University, we believe that there is no yield risk with using glyphosate for weed control in Roundup ready Crops. As always glyphosate should be used as part of an integrated pest management system when needed, be sure to follow all label directions when using these products. For more info on these articles, click on the links below.
Iowa State University
Purdue University
Wednesday, March 16, 2011
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