Have honeysuckle and some kind of thorn bush with a red berry and vine killing trees. Any advise how to kill these things off? Some of the honey suckle is 4-5 inch diameter. I might be able to pull up some of the honeysuckle but worry about leaving roots to regrow. The thorn bush has a ton of shoots from a central area.

Round up brush killer

Would I need to cut the vine and apply the killing agent to it where it goes into the ground?

^^^ May take more than one application.

I would spray the bush as it grows and give the roundup time to move down to the roots.

No spray the leaves.. it has to transfer through leaves and stem

For vines that big I'd hack with an ax and spray with Tordon. @ tractor supply, among others.

Cut them. off and apply roundup to the stumps. Only need to apply it to the outer growth area (cambian). Will take it into the roots and kill it. I had a big mat of honeysuckle and set it on fire, it never came back.Burn in the spring when it first shows sign of waking up.

do not pull you will leave roots and then honey suckle comes right back from the roots you need to kill the roots

cut about 4-6 inches above grade , put herbicide on the fresh cuts within 10 minutes , before the stump has a chance to get dry surface

loppers , chain saw , brush saw what every you like to cut , cut off one plant , treat stump . repeat on each plant

some follow up the next spring early when any new is popping up from roots that didn't get killed or small stuff you missed. if you catch it early enough you can just spray the leaves of the young shoots with a herbicide.

Honeysuckle type:
When in full leaf spray with Crossbow generic equivalent. Do not use too much as it can translocate - can travel from the plant roots in the soil and kill neighboring trees or plants.
Or cut and treat the stumps with Tordon RTU.

Vines growing up a tree - chop out a 6” section. Do not chop into the tree bark. When new growth starts in the spring treat it with roundup. No Tordon because the vine roots are too close to tree roots.

I've been dealing with an infestation of buckthorn in my woods. I cut off the plant near the ground and paint the stump with undiluted Crossbow. It kills the plant and the roots.

I can give you some cotton tails to solve the problem they eat trees like crazy here.

Cut them,pile them up and burn them.

I have cut some of them because they where in the way of cutting down some pine trees and I burnt them. There's a ton of the honeysuckle, so the thorn bush is called buckthorn? It's yellow inside when I cut it and burnt it. Thanks for all the information guys .

Not sure what you've got there if it's buckthorn or not. You could google buckthorn to be sure. The larger plants have black berries. Buckthorn also stays green into winter longer after every leafy plant has lost it's leaves. I also am plagued with Prickly Ash in my woods. I use the same method to kill it as I do for the buckthorn. Prickly Ash is much easier to kill than the buckthorn. Both are an unwanted invasive species.

Looked up both and it's neither one. It looks like a rose bush with a red berry

It’s probably multi flower rose . It grows wild here, it died off about 20 some years ago and now it’s coming back . I don’t think that spelling is correct.

Cut them at the base, then spray the bases once the new growth starts.
If they are that big then don't use round up, use a dedicated woody weed poison like Tordon

Prickly Ash bark has more value pound for pound than a coon hide. There is always a market for it.

Tordon X2