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Drift from Glyphosate (07/16/15)

The following is an email response from Dr. Kirk Howatt, NDSU Weed Scientist, to a question received about assessing glyphosate damage:

Drift from Glyphosate

The following is an email response from Dr. Kirk Howatt, NDSU Weed Scientist, to a question received about assessing glyphosate damage:

Question:   I am an independent property and casualty adjuster.  I am looking for some information that might suggest the levels of glyphosate necessary to cause damage to growing crops such as wheat or flax and perhaps something that might suggest the extent of damage at progressive levels of glyphosate. If there is anything handy that might be of help in evaluating issues involving real or imagined damage from this herbicide pointing me in the right direction would be appreciated.

Dr. Howatt’s Answer:  Concerning wheat, if visible injury is easily detected, yield loss likely occurs. Injury of 10-15% stunting and chlorosis often resulted in 20-40% yield loss.  Injury increases quickly with small increases in glyphosate exposure.  Residue levels vary greatly according to preliminary evaluations.  We have sought funding to investigate this area but of crop production but have not been successful. I think the industry and commodity groups are interested in this herbicide drift/crop injury connection but have not made the necessary contacts to support the residue work.

Rich Zollinger

Extension Weed Specialist

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