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Buckthorn and Honeysuckle herbicide questions
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Posted by giantslug 4b/5 SW Minnesota (My Page) on Mon, Nov 10, 08 at 0:58
I have been cutting and and painting the stumps of Common Buckthorn this fall with Garlon 4 in mineral oil (1 part G4 to 3 parts oil). I am wondering how long into winter can I do this and still have it be effective? Will it work even after the soil is frozen? Also, will Garlon 4 in oil work on shrub honeysuckles (Tartarian and Morrow)? I have found conflicting information on this, some sites I have read say Garlon is not effective on honeysuckle and others say it is.
Comments on your experience with killing buckthorn and shrub honeysuckles would be nice too.
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Follow-Up Postings:
RE: Buckthorn and Honeysuckle herbicide questions
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| Hi. I've been waging war on Buckthorn here in Meeker county for 5 years now. My 2 1/2 acres was totally overrun with the stuff. My strategy is to spray new green growth with high concentration of 2-4-d(~= 2%). This is only done in early Spring when new growth is present. Cutting large plants one year results in lots of suckers the next year which are then doused with 2-4-d. This mostly kills it. About 10% will need another dose the next year. This is the best way I've found to eradicate huge numbers of the things. Spraying in early Spring also saves the natives growing nearby as they green up later. |
RE: Buckthorn and Honeysuckle herbicide questions
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| I've been using Garlon 4 (1 part to 3 parts diesel or bark oil) on buckthorn cut stumps (in MN) for 10 + years. You can treat all through the winter (when I do most of my cutting) with equally good results. It also works well on Tartarian honeysuckle. I've even killed buckthorn this way in spring when the sap flow is supposed to inhibit kill: it still killed for me, but I have a lot more experience in the cold months. |
RE: Buckthorn and Honeysuckle herbicide questions
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- Posted by jpal MA 6 (My Page) on
Fri, Mar 13, 09 at 2:12
| The snow has finally melted here in New England and I'd like to experiment with doing bark treatments on buckthorn. I have a couple of questions I hope someone might answer. I'm hoping my costs down for this experiment period. (I don't like the idea of using 2,4 D as it sounds rather hazardous.) I haven't found another formula of Triclopyr ester labeled for this use other than Garlon 4, is there one? Maybe something cheaper? If not, is there a place where one might purchase a smaller quantity than 2.5 gallons at 300 plus dollars? I'd like to not use diesel so I don't piss off some folks around here. Where does one get mineral oil in sprayable quantities? All I've found so far is pints for laxative use :-) Is bark oil available in smallish quantities anywhere? I'm eagerly looking forward to trying a different technique other than the Weed Wrench attack on the buckthorn. Thanks very much for your assistance, and be assured this information will get quietly spread around the Boston area. |
RE: Buckthorn and Honeysuckle herbicide questions
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I found light mineral oil (for livestock use) in one gallon quantities at my local farm/ag supply store. Bark Oil Blue is another diluent that may be available at farm supply stores or ag co-op stores. I found a source for generic Garlon 4 online in one gallon quantities, the link is at the bottom of my post. Pathfinder II herbicide is also less expensive than Garlon 4, it is a pre-mixed triclopyr ester herbicide available in 2.5 gallon quantities. I don't know if you can get it in MA though.
I would be cautious about applying herbicide in the spring, it may not be as effective as applying it in fall and winter. |
Here is a link that might be useful: Triclopyr herbicide
RE: Buckthorn and Honeysuckle herbicide questions
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| My friend who owns a native landscaping business uses 100 percent roundup on buckthorn and paints it on stumps all winter long. He also said you can paint it at 100 percent on the bark at any time and it will absorb the roundup and die. |
RE: Buckthorn and Honeysuckle herbicide questions
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| Roundup is a brand name. There are products with different chemicals and concentrations under the name Roundup. Glyphosate is the main chemical in most Roundup herbicides. My neighbor has used Roundup RTU (2 percent Glyphosate I think) on cut Buckthorn stumps last year and it was almost totally ineffective. I have read that 20-50 percent Glyphosate concentration should work on Buckthorn. Also, if you are looking for Glyphosate, there are many generic brands that are much cheaper than Roundup. |
RE: Buckthorn and Honeysuckle herbicide questions
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| There are many ways according to this thread. A local Extension officer said on public tv the other day that you can cut, wait for the sprouts, then hit them with Glyphosate 2% on the leaves. I have 6 nasty acres of the stuff. I have cleared 3 1/2 so far, but the stumps are getting hidden and are hard to get at. I dont want to recut just to apply the Glyphosate. So I guess I will try spraying the sprouts that come up in the fall and see what happens. Any thoughts? |
RE: Buckthorn and Honeysuckle herbicide questions
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| "My friend who owns a native landscaping business ... said you can paint it at 100 percent on the bark at any time and it will absorb the roundup and die." While I have never tried this, I really doubt it would work even with the Pro strength stuff (homeowner concentrations definitely don't work this way). There is no mechanism to carry the chemical from the bark to other parts of the tree. Maybe enough of the Pro strength stuff would find cracks to enter and, because of it's strength, could be effective at times, but it certainly doesn't sound reliable to me. I'd have to see it to believe it. |
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