I think it's largely unavailable now, unless you buy in 205l drums. It's an odd thing to ask for domestically, and if you don't already have a relationship with an agri supplier and can't do with a bit of Round Up.

in Tree & Stump Care, Ground Maintenance, Landscaping, Lawn Care, Yard Will Tordon Kill Surrounding Trees? Spring is not the ideal time to kill standing trees with a herbicide solution. In spring, sap flows upward from the roots. Any herbicide administered through the bark may not reach the roots. This could result in the upper portions of the tree dying while new shoots come up from the roots and base of the trunk. What is the Best Herbicide for Killing a Tree? Roundup will not enter the soil and harm nearby trees and plants, making it safe for use near desirable plants. But since the active ingredient here works on the roots rather than on the wood, the decay of the stump will take longer than other products that accelerate the decomposition of the wood. That means that you’ll have a dead stump lying around in your garden for months waiting for nature to take its course. Pros The best methods for killing a tree without felling it are to spray the base of the tree with Tordon, cut gashes in the tree trunk that are then filled with herbicide, removing a ring of bark around the tree, or drilling holes into the tree trunk before injecting them with herbicide. For trees less than 15 feet tall, you can spray the leaves with Roundup or similar herbicide, which will penetrate to the root and kill the tree.On a related note, some people have been known to use Tordon on plants other than woody plants. Their reasoning might be something along the lines of a herbicide being a herbicide, meaning that if it is good for one kind of plant, it should be good for a different kind of plant. However, it is important to note that this is not the case. Use a hatchet, hammer and chisel, or chainsaw to remove a belt or “girdle” of bark all the way around the tree.

One solution would be actually injecting Tordon into the tree, which needs to be repeated all around the tree’s perimeter rather than just the once. Another solution would be using an ax to make cuts all around the tree in a manner that the injured areas overlap. After which, interested individuals can either paint Tordon on the injured area or spray Tordon on the injured areas. Tordon is very specifically meant for use on woody plants, meaning that interested individuals cannot count on it having the desired effect when it is used on plants other than woody plants. Instead, they should look into a different herbicide that is meant for that different kind of plant. If interested individuals think about it, this limitation makes sense. After all, something that is poisonous to one kind of animal isn’t necessarily to another kind of animal, so it stands to reason that something that is poisonous to one kind of plant isn’t necessarily poisonous to another kind of plant. As such, interested individuals shouldn’t expect Tordon to do anything about plants that are beyond its intended use. Drill a half inch hole getting as close as possible to the center…may drill more than one around the girth of the tree near the base…insert ⅜ copper tubing and plug the holes with soft mud. You won’t get good results from using Roundup in this way. Glyphosate, the active ingredient in Roundup, is water-based and will evaporate rather than penetrate the bark. You may damage very young, thin-barked trees with Roundup in this way, but it’s unlikely you’ll kill the tree. For this method, Tordon is the best option. Cut Surface Treatment

Active Ingredient

Use enough water to wet the weeds without run-off, 400 to 800 L of spray per treated hectare is usually required. Controls invasive weeds such as Japanese Knotweed. What does Tordon 22K herbicide control? Tordon 22K herbicide controls a wide range of perenial and annual broad leaved weeds in non-crop land. It is also effective against woody weeds and scrub. It will not harm grass when used at the correct dosage. Picloram is of moderate toxicity to the eyes and only mildly toxic on the skin. [3] No history of human intoxication by picloram has been documented, so symptoms of acute exposure are difficult to characterize. Trees under 15 feet tall can be killed by spraying the foliage with Roundup or a selective weed killer, such as 2,4-D. The bonus of this method is that, unlike the others, it is effective in spring and summer.

Committee to Review the Health Effects in Vietnam Veterans of Exposure to Herbicides; Institute of Medicine (1994). Veterans and Agent Orange: Health Effects of Herbicides Used in Vietnam. National Academies Press. pp.89–90. ISBN 978-0-309-55619-4.I have pounded solid copper pennies late 50’s to 60’s into the tree it will soon die for about 10 cents. in Tree & Stump Care, Ground Maintenance, Landscaping, Yard Will Tordon Kill Bamboo [5 Steps to Kill Bamboo Permanently] Somehow Gordon’s Stump Killer can kill other trees around it. So here’s the strategy. Kill an adjacent tree or bush with Gordon’s Stump Killer and all trees close by should die as well. There are no guarantees this will work but if what this guy said is true then Gordon’s Stump Killer could be the solution. Slowly Poison A Tree Undetected Tordon is a brand name for a group of herbicides containing picloram. Tordon is used to control broadleaf weeds and brush on pastures, rangeland, and other noncropland areas, and is typically applied to the roots of weeds. Tordon is labeled for use through a sprayer and as a granule application, and is designed to have no residual effects.