[MAIPC] Triclopyr vs Glyphosate

Mon Apr 20 20:12:09 PDT 2015

To avoid drift, and reduce amount sprayed, we routinely have volunteers cut many of the species near the ground and come back later to foliar spray downwards. (for example, wisteria, porcelain berry, bamboo)

Marc Imlay, PhD, Conservation biologist, Park Ranger Office, Non-native Invasive Plant Control coordinator. 
(301) 442-5657 <tel:%28301%29%20442-5657>  cell  ialm at erols.com <mailto:ialm at erols.com> 
Natural and Historical Resources Division
The  Maryland-National   Capital   Park  and Planning Commission
 <http://www.pgparks.com/> www.pgparks.com  

From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of Todd Hagenbuch
Sent: Monday, April 20, 2015 9:09 AM
To: kate; maipc at lists.maipc.org
Cc: Dave Krause; Joseph Lentz
Subject: Re: [MAIPC] Triclopyr vs Glyphosate

Kate:

Both Glyphosate(Accord, Roundup, Rodeo, etc.) and Triclopyr (Garlon 3a & Garlon 4 Ultra) are registered with the EPA and safe to use when following label guidelines.  Both have fairly high LD50’s which means low toxicity to humans and animals.  They both break down in the environment quickly with no residual activity in the soil.  The Garlon 3a in fact has a Danger signal word on the label only for the fact that it causes eye irritation or eye damage.  As usual with most herbicides, I recommend safety glasses regardless.  This, of course, is more of issue when mixing the concentrated product.  The bigger question of what product to use is the target plants.  If in fact you have invasive bush honeysuckle then Glyphosate(Accord XRT II) as a foliage application is the key to control.  If you have Autumn Olive then Garlon 3a(+surfactant) as a foliage application is the best product for the control of the plant.  So, choosing one product over the other due to perceived environmental and/or applicator safety may defeat the purpose of spraying herbicides in the first place.  Know the product, know the targets that we are trying manage, and minimize risk with the proper product and application type.  To answer the organic vegetable garden down slope question…..  If drift of herbicide is a potential due to medium-high winds, then great care should be taken as to make sure the herbicide stays on target and doesn’t drift off site.  With the addition of drift control agents, we can minimize or eliminate the potential for herbicide sprays to move off site.  Another caveat to consider is whether or not you are using Garlon 4 Ultra or Pathfinder (Ester formulation of Triclopyr).  These products have the potential to volatize on very warm days.  Avoid application of these products when the temperature exceeds 85 degrees or the application area is on a south facing slope in direct sunlight.  Likely you wouldn’t have an issue with these products(Garlon 4 Ultra & Pathfinder) this time of year.  Feel free to contact me with your targeted invasives list and how the contractor plans to control the invasives and I will let you know whether the plan is solid or not.  

Best Regards,

Todd Hagenbuch

Vegetation Management Specialist

Arborchem Products 

2505 Coventry Lane

Glen Mills, PA 19342

570-401-7098

thagenbuch at arborchem.com <mailto:thagenbuch at arborchem.com> 

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

From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of kate
Sent: Friday, April 17, 2015 9:36 PM
To: maipc at lists.maipc.org <mailto:maipc at lists.maipc.org> 
Subject: [MAIPC] Triclopyr vs Glyphosate

A perhaps basic (and I hope appropriate) question to the forum:

What are the bulletpoint differences between triclopyr and glyphosate? Is one vastly less toxic than the other? On the minute scale (single residence, invasive hedgerow), is there any major argument for one over the other? 

The specific situation is a homeowner who received two invasive removal bids with a large price difference, glyphosate contractor being cheaper by 40%. Does it make any difference with the following details: an organic vegetable garden down-slope? A kid roaming around?

Thanks to all for any input...

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