Triclopyr 3 is really what you want for Ailanthus but this may work as well. There are two methods of treatment, hack and squirt or basal bark treatment. Basal bark treatments are cut with diesel that acts as a surfactant, you spray the bottom 2 feet of the stump making sure you've got good coverage and let it sit. The diesel will hold the triclopyr and glyphosate mixture in place and begin to saturate into the live layer of the tree (the surface right under the bark or the newest ring). Basal bark treatment should only be used with Ailanthus trees under 4-6" in diameter. Hack and squirt method is for any tree larger in diameter than ~6". First you take a hatchet and cut into the base of the tree as low to the ground as possible by using a downward swing (45 degrees or greater is ideal). The downward swing will create a little cup-like wound in the tree. DO NOT GIRDLE THE TREE! Leave even spacings between the hacks, if your hatchet is making 3" wounds then leave 3" of space between each hack. Once you've went around the whole tree you need to immediately apply your triclopyr and glyphosate mixture otherwise the tree gives off a sap that will effectively seal off the wound within 10 to 15 minutes of hacking the tree, so you need to move with intent. For this method I use a handheld 0.5 multi-purpose sprayer with a thumb trigger, not a backpack or wand sprayer as this method requires very little herbicide. Take the multi-purpose sprayer and fill up each cupped wound with your herbicide while trying not to overfill it because you are just wasting it at that point. The best time of year to treat Ailanthus Altissima is from early July through mid-September when the tree is actively sending its energy absorbed from the canopy down into the root system to fortify itself for the next year. This will actively draw the herbicide down into the root ball and give you the best chance of killing this invasive species in one shot thereby minimizing the amount of "suckers" that the root system with try and shoot up because you directly harmed the root system. If the tree you are treating is 50' tall you need to keep an eye out for suckers in a 50' radius of the tree. You can keep cutting them as they come up but I strongly suggest treating with herbicide and even waiting for July to roll around before messing with it because the root system is heavily relying on these suckers to provide the much needed energy to fortify the stunted root system.

What is the mixing ratio of this product per gallon of water or do you have to use it straight?

For foliage application to poison oak and thistle, I use 2 to 2.5 oz per gallon of water, but you must add a surfactant, as the esther form of triclopyr (which this is) is oil soluble, and will not mix without the surfactant. Plus you need to agitate the mixture from time to time, which is not a problem if you are using a hand held tank sprayer. You can also use it for basal bark treatment to kill small trees less than 6-8 inches in diameter, if you dilute it to about 15 % Triclopyr concentration in oil (Pathfinder II is the same Triclopyr 4 specifically premixed for basal bark treatment, with a 13% Triclopyr concentration, but a lot more expensive). You can also use it straight for cut stump treatments or "hack and squirt" treatment to kill large trees, although the water soluble Triclopyr 3 form is sometimes preferred for this application.

I need to control the spread of creeping charlie. Which product, Triclopyr 4 or 4EC would be most effective? When should I apply the product?

Trimec® is a safer alternative for creeping charlie, as it wont harm trees and shrubs as easily. Use 175oz/acre, with a non-ionic surfactant. (the homeowner version is rather dilute because of the Dicamba content). Trimec® will not, however kill wild violets. Triclopyr WILL do that. Use triclopyr 24oz/acre rate, with a non-ionic surfactant, for wild violets. The best time to kill either of these difficult weeds is late September through early November depending upon your climate zone. The weeds will be taking nutrients (and herbicides) into their roots for storage to overwinter. (certified pesticide applicator). Spot spraying is always preferable to broadcast spraying with with either of these herbicides anywhere near trees and shrubs, when possible.

Five acre rural lot with at least a third heavily infested with buckthorn. Hundreds of hours of cutting, spraying with Roundup (in fall). Best?

http://www.dnr.state.mn.us/invasives/terrestrialplants/woody/buckthorn/control.htmlThis site will help.On leaves, a spaced combination of 2-4D and a little glyphosate in water tends to be effective. In fall and winter, 20 t0 30% triclopyr applied to cut stem or basal bark can be effective. Including a die helps keep track of work. A wetting agent like inexpensive liquid soap is desirable. Some people use oils to aid in penetration. I use 4 or 5 oz. of GORDON'S "Amine 400" 46.47% 2,4-D 3.7 lb/gal acid and about 1.5 oz. of glyphosate concentrate in a gallon of water along with an ounce of liquid soap to spray on leaves (foliar) of similar weeds.2-4D is relatively inexpensive compared to triclopyr - try broadcast early in the year including a dose of glyphosate . It might work. However, basel stem application of triclopyr now may deal with the problem - except for seeds!

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Description

🌿 Unleash Nature's Power with Triclopyr 4 EC!

ECO CONSCIOUS CHOICE - Designed for responsible land management.
VERSATILE APPLICATION - Ideal for forests, pastures, and non-crop areas.
USER FRIENDLY LIQUID FORM - Easy to apply with precise coverage.
POWERFUL ACTIVE INGREDIENT - Harness the strength of Triclopyr for superior control.
CONQUER WEEDS WITH CONFIDENCE - Effectively targets woody plants and broadleaf weeds.

Triclopyr 4 EC is a potent herbicide designed for the effective control of woody plants and a variety of broadleaf weeds. With a coverage of 1 gallon, this liquid formulation is perfect for use in diverse environments, including forests, grass pastures, and industrial sites. Its active ingredient, Triclopyr, ensures powerful results while promoting responsible land management.

Reviews

P**N

KILL TREE OF HEAVEN ONCE AND FOR ALL, AND SIMPLY AND EASILY

To get rid of tree of heaven infestation, DO THIS. It works!Step one is simply cut down the trees whenever you want to. they say not to do this but they are wrong.Yes there will be tons of new shoots growing from the roots and this is what you want to happen.But why? Because the new young shoots are easy to kill and they do hot have the ability to produce new shoots. After you cut the trees down a forest of shoots will appear and thet is good. Now lightly spray those new shoots with this product and they will immediately turn brown and DIE, TOTALLY DEAD.This happens within a day of two at most.The secret is to never allow a shoot to mature. The roots cannot survive without nourishment from cleaves and there is no guessing about that fact.CUT THE TREES AND THEN KILL THEY'RE YOUNG SHOOTS WHEN JUST A LIGHT FOLDER MISTING WITH THIS PRODUCT WILL KILL THEM IMMEDIATELY or sooner.yES, this goes against "conventional advice" on the subject, but I had a terrible infestation pf tree of heaven and I killed them all in one season using this product as described above.

22.07.2025

A**R

Great Weed killer

Powerful weed killer. Kills English Ivy which is very hard to kill. Expensive but worth it.

27.05.2025

M**K

WEED KILLER

Arrived on time but had leaked a little. Sprayed three days ago and weeds are already dying. I mixed 5 tbs to one gallon of water. Worked sooner than expected.

27.07.2025

L**E

Works great!

Works great in pepper wood!

31.08.2025

K**R

Does the Triclopyr chemical actually work and advertised

Bought the product to spray Canadian Thistle, it appears to be working well, thistles are wilting and drooping down.

13.06.2023

G**N

Killing black locust trees

Bought specifically to kill these damn Black Locust trees we have here in TN. Mixed a batch of 3/4 gal diesel and 3 cups of Trico per instructions (1/4 ratio) in a high quality gallon chemical sprayer and headed outside. Sprayed several smaller locusts and a bunch of Princess tree (Paulownia ), they pop up everywhere here too esp after chopping down each year. Well its been a week and both are withered up and drooping to the ground. Gonna wait till Fall to really attack everything when the sap goes back down to the roots, but so far results are VERY promising that it'll finally kill these damn things. I sprayed the bottom bark up a few feet btw....

12.07.2025

K**A

Works Great When Other Herbicides Won't

I do an extensive amount of tree removal on a farm. I've used the cut stump treatment with glyphosate in the past. It's worked fairly well on many species I want to remove. Notably, it doesn't do well on osage orange, black locust, and it's not optimal on honeysuckle. There could be others, but those come to mind first.I haven't found much that this Triclophyr 4 doesn't work well on for my needs with a small caveat on one species I'll mention later. I mainly use this for basal bark treatment since it's quicker than cut stump. It's worked really well on Multiflora Rose, Russian Autumn Olive, Japanese Honeysuckle, and just about anything under 6"...perhaps larger if it doesn't have rough bark.The one caveat I mentioned is black locust. I learned to not cut black locust and treat the stump. I instead recommend doing a basal bark treatment at 25% Triclophyr to 75% diesel fuel (basal oil can be used to allow the herbicide to penetrate the bark but diesel is cheaper). Apply to the bottom 12-16" and exposed root collar, if applicable. Cutting the tree and applying to the cut stump leads to a prolific mess of root sprouts in black locust and doesn't kill the tree. I imagine sumac and persimmon would be similar if you wanted to get rid of those. Applying this herbicide using basal bark treatment has worked really well on killing the tough black locust tree as well as many others I've used it on. Hopefully this helped you figure out if this will work for your situation.

20.08.2024

W**E

Works

Mixed as recommended, started killing weeds in 24 hours, by the end of the week, you could clearly see what we missed and what we got to close to…

7.07.2025

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