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Dicamba Injury to Soybean (8/03/17)

There has been significant inquiry about the possible causes of plant growth regulator symptoms on soybean.

Dicamba Injury to Soybean

There has been significant inquiry about the possible causes of plant growth regulator symptoms on soybean. Verification of symptoms from Extension publications or material is a common request. We have discovered an excellent Extension publication authored by Dr. Chris Boerboom, our most illustrious NDSU Extension Director, while he was working as an Extension Weed Specialist at University of Wisconsin. This was written in 2004 long before the invention of dicamba resistant soybean. He addresses spray drift, dicamba vapors, contaminated spray, injury, and yield loss. He also includes good photos of dicamba symptoms on soybean.

http://ipcm.wisc.edu/download/pubsPM/dicamba2004.pdf

There are other points to consider on soybean affected by dicamba drift:

- Dicamba damage on soybean is generally worse in drought situations.

- Depending on the plant stage when affected the impacted plants may show flower, pod, seed abortion/malformation in addition to cupped leaves.

- Most research from dicamba drift on soybean yield does not address repeated exposure to dicamba. Research summarizes single doses applied at different times and concentrations.

- In summary, yield losses cannot be predicted before harvest because drift exposures may have occurred at multiple times and in concentrations that are not known.

 

 

Rich Zollinger

Extension Weed Specialist

 

Andrew A. Thostenson

Pesticide Program Specialist

 

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