[MAIPC] triclopyr and glyphosate

[John Lampe]

Scott,

 

If you are doing cut stump treatments, you can definitely do those in temps below freezing – my cut-off is generally 25F.  Many others do treatments up here in the north country (Minnesota) during winter.  Here’s our post on doing winter cut stump and basal bark treatments: https://greenshootsnews.blog/tag/how-to-get-rid-of-weeds-in-winter/ 

 

John

 

John Lampe

651-245-4682

 <mailto:john at greenshootsonline.com> john at greenshootsonline.com

 <http://www.greenshootsonline.com/> www.greenshootsonline.com 

 



 

post on winter cut surface and basal bark treatments: https://greenshootsnews.blog/tag/how-to-get-rid-of-weeds-in-winter/ 

 

From: MAIPC <maipc-bounces at lists.maipc.org> On Behalf Of Mark Frey
Sent: Wednesday, March 7, 2018 11:32 AM
To: Scott Baron <baron.scott at gmail.com>
Cc: maipc at lists.maipc.org
Subject: Re: [MAIPC] triclopyr and glyphosate

 

Scott

 

You'd better check the labels to be sure but I have had good luck spraying glyphosate mixes down even below freezing (although the soil has been above freezing) and I have sometimes added Ammonium sulfate - it is supposed to help in the cold. we routinely treat celandine in the 30s and 40s with 1% Rodeo and have good luck with no Ammonium sulfate.

 

extreme temperatures have led to the salts crystallizing and then being hard to get back into solution. If you don't have crystals and the herbicide isn't more than five years old I wouldn't worry about it. Someone else may have a more authoritative answer on that though!

 

Mark

 

On Wed, Mar 7, 2018 at 11:01 AM, Scott Baron <baron.scott at gmail.com <mailto:baron.scott at gmail.com> > wrote:

Good morning, invasive fighters.

 

I have a couple of questions for which I can't find a definite answer.  

 

1) Is there a minimum air temperature for effectiveness of triclopyr and glyphosate?  I've heard of temperatures of at least 40 or 45F for glyphosate and I think I read 50F (10C) for triclopyr.

 

2) Does anyone know if (triclopyr and glyphosate) "go bad" after reaching a certain temperature in storage?  

 

I see that Garlon 3A (triclopyr) should be stored "above 28F or agitated before use."  Aquaneat (glyphosate) should be stored "above 32F to keep from crystallizing.  If allowed to crystallize, warm to 68F (20C) and mix well or recirculate to redissolve before using."  Does anyone have anything to add?

 

Thank you,

 

Scott Baron

Gaithersburg, Md.


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