Name and Position/Title:
Fiscal Year Submitted:
POW Title and Number:
102 Crop protection
Farm visit has monetary impact
Issue (Who cares and Why):
I had a call from a farmer who some unexplained damage to his corn crop. There were replant concerns, crop insurance concerns and potential legal issues.
What Did You Do? (Outputs – these may include educational meetings, demonstrations or research, media, facilitating, partnering)
I observed the field of conventional (non Roundup Ready) corn on June 7, 2010. Glyphosate contamination in the conventional herbicide application was suspected because of the crop injury symptoms and the lack of symptoms on the adjacent Roundup Ready hybrid. Lab analysis of the affected corn plants confirmed glyphosate contamination. Glyphosate had apparently contaminated the conventional herbicide and caused significant damage. The source of this inadvertent glyphosate could not be determined.
Results (Outcomes – was there a increase in knowledge, new skills learned, new decisions made, new practices implemented, increased profitability, new standards).
The Banvel and Impact herbicides in the conventional herbicide tank mix prevented replanting to soybean. The yield potential of corn replanted on June 8 is about 54% of normal (108 bu/a). Replant costs are about $50.00 per acre plus about $30.00 per acre machinery costs. However, corn replanted in June carries risks of low yields and high grain moisture. Further observation of the affected corn plants showed some new root and shoot growth. The decision was made to not replant the field.
Grain yields measured in the fall showed that the glyphosate damaged corn yielded 125.0 bu/a. An adjacent area of the field that was not damaged yielded 199.8 bu/a. The final corn yield would likely have been similar had it been replanted. However, there was cost savings from leaving the original crop. The impact from this farm visit is 1.) that the cost replanting was saved on about 35 acres ($2800.00), 2.) products from only unopened containers will be used in future pesticide applications and 3.) Roundup Ready corn hybrids will be used in the future since glyphosate is so widely used in today’s crop production.
The farmer also remarked, ‘I appreciate you coming out to evaluate this field’.
Page last updated:
July 18, 2011
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