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Grazing Restriction for 2,4-D (6/29/17)

Question: I am wondering why there is a 30 day after application haying restriction for 2-4-D when there are no grazing restrictions. I have been getting calls asking about these haying restrictions.

Grazing Restriction for 2,4-D

Question: I am wondering why there is a 30 day after application haying restriction for 2-4-D when there are no grazing restrictions. I have been getting calls asking about these haying restrictions.

Answer: The short answer is that was the way the residue studies were done for EPA registration.

Another answer might be due to concentration – animals that graze on treated forage would have a diluted concentration of 2,4-D because of the high water content in plant foliage. Foliage processed for hay would be dry (water evaporated) allowing the herbicide to be more concentrated in plant material and which might require the 30 days for degradation to occur.

Rich Zollinger

Extension Weed Specialist

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