Best herbicide to kill underbrush/weeds without hurting post oak trees

[dclifton]

GrazonNext can and will kill oaks. Been there done that.

It will but if hes just spraying low and at the right ratio it will be ok. Its not going to get the big trees. Now it may make the saplings sick.

[BrianL]

Just keeping it mowed will help some. Too much risk with those trees to spray without knowing for sure. Might call your local chemical store (like Winfield, Helena, Nutrien), and ask them.

[friscopaint]

I avoid grazon on my place, it specifically says to not put inside drip line of trees and some old buddies that worked for FSA told me not to use it under trees so I use 24D amine.

[BrianL]

It will but if hes just spraying low and at the right ratio it will be ok. Its not going to get the big trees. Now it may make the saplings sick.

I killed some 6" dia. pin oak trees close by the house that I really didn't want to get(1 qt/ac of GrazonNext)). I thought they were big enough, and I was wrong. The elm trees weren't phased at all.

[dclifton]

Preemergent is definitely in my plans for next year. I was hoping to find something I could spray over the top of everything with my tractor, but spot spraying everything to avoid the trees is probably the safest bet. Maybe skip under the drip lines of the trees and just hoe all of that. It's a lot to do by hand. Around 5 acres. It's only sweat though, right?

Spray regular grazon with a boom at a qt per acre. It will be fine. I spray fence lines broadcasting and underbrush regularly. It may burn a limb on one if it hits it but wont kill a big one. And thats with Spraying Remedy and Grazon.

You pretty much have to hose and oak tree down to kill it by contact.

[dclifton]

I killed some 6" dia. pin oak trees close by the house that I really didn't want to get(1 qt/ac of GrazonNext)). I thought they were big enough, and I was wrong. The elm trees weren't phased at all.

Boom or broadcast? We have been spraying pastures with Next. I use regular old grazon and remedy or Pic 22K for fence rows. And even that combination you pretty much have to hose it down to kill one. And that mix is stout when i do it.


1 qt acre of grazon next is pretty strong. Pasture recommended is 24oz.

[Dusty Britches]

For most of those weeds 2,4-D will kill them, but that herbicide could cause leaf damage to your trees. Sometimes it does, sometimes it doesn't. Half of my pecan trees hate it, half of them could not care less. Grazon has 2,4-D in it. Good thing about it, it will typically not damage most grasses.

Since you are worried about the trees, you might be better off with and MSM product like Plotter or Cimarron Plus (not Max, it has 2,4-D and Dicambia).

[Calrob]

Spray regular grazon with a boom at a qt per acre. It will be fine. I spray fence lines broadcasting and underbrush regularly. It may burn a limb on one if it hits it but wont kill a big one. And thats with Spraying Remedy and Grazon.

You pretty much have to hose and oak tree down to kill it by contact.

Id be careful spraying under the drip line on oaks, grazon and 24d both take in at the leaf and feed into the root system to kill plants. If your target plants and that big oaks roots are intermingled, your oak will be just as dead as the target plant.

[BrianL]

Boom or broadcast? We have been spraying pastures with Next. I use regular old grazon and remedy or Pic 22K for fence rows. And even that combination you pretty much have to hose it down to kill one. And that mix is stout when i do it.


1 qt acre of grazon next is pretty strong. Pasture recommended is 24oz.

It may have been 24oz. I know I use one jug per 10 acres. It may come in 2 gallon instead of the 2.5.

Boomless sprayer

[dclifton]

It may have been 24oz. I know I use one jug per 10 acres. It may come in 2 gallon instead of the 2.5.

Yep 24oz is right. 2 gallon jug. Thats weird tho you was unlucky that day.. Regular Grazon would be a safer bet. with a good bit of surfactant.

[Shane]

Id be careful spraying under the drip line on oaks, grazon and 24d both take in at the leaf and feed into the root system to kill plants. If your target plants and that big oaks roots are intermingled, your oak will be just as dead as the target plant.

That's what concerns me.

[dclifton]

Id be careful spraying under the drip line on oaks, grazon and 24d both take in at the leaf and feed into the root system to kill plants. If your target plants and that big oaks roots are intermingled, your oak will be just as dead as the target plant.

Been doing it for years never an issue. And we are in a wet area where we get rain that would carry it down faster. Or it dilutes it faster i guess the argument could be made either way. Not sure anyone knows that answer exactly. I wish some of our trees would take it up through and die especially elms and sweetgums but it hasnt happened yet.

[friscopaint]

I value my pecans and oaks to much to risk it. I'm not comfortable enough when some say they have killed theirs by accident with grazon and others say it's just fine, especially when the label specifically says not to spray inside drip line.

[BRUTE 23]

A stout fart can kill a post oak. Live oaks are more durable. Definitely don't get grazon on the trunk.

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[Tokio]

Had a buddy spray round up under mature oaks. It killed a few and really damaged the others. Not sure how strong his mixture was but I would not chance it. He is just a normal homer owner with a pump up sprayer