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Herbicide that has Been Frozen (05/25/17)

Question: I had a call about some Tordon that is 4 to 5 years old and to make it better yet, it had been frozen every winter. Is it still an active herbicide? Is there a rule of thumb for frozen herbicide?

Herbicide that has Been Frozen

Question: I had a call about some Tordon that is 4 to 5 years old and to make it better yet, it had been frozen every winter. Is it still an active herbicide? Is there a rule of thumb for frozen herbicide?

(Round about) Answer: A few years ago, in an attempt to make the weed guide a little smaller we took some material out of the weed guide and posted it on the web version of the weed guide. The Herbicide Storage Temperature section was one that was placed there.

For example on pages 74 and 75 at the end of each section it is advised: “For an expanded discussion go to xx in the electronic version of the weed guide.

The contents page for the Weed Guide is at:

https://www.ag.ndsu.edu/weeds/weed-control-guides/nd-weed-control-guide-1

For the answer to this question, go to General Information and choose A12 – Herbicide storage temperatures.

The information provided there says: May store below freezing but warm before using

2,4-D amine, 2,4-D ester*, atrazine 4L*, Betamix*, Dual Magnum*, MCPA amine and ester*, Tordon*, and Weedmaster*.

I recommend the grower use the product at recommended use rates. The use of Tordon on perennial weeds species usually requires another application anyway.

Rich Zollinger

Extension Weed Specialist

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