Black Locust-Crossbow

I have alot of BL. It is very invasive. I want to kill the invasive BL (I.E)Ihe stuff that has been encroching on my hay fields, Oak/cherry woods, pasture,barn yard. I Have some very good locust that I do not want to kill. I need to draw aline on the invasive stuff though.
The good locust I want to cut post out of(when the time is right.) Knowing this how would you approch this situtation?
last year, I pulled out alot of it that was in our old garden spot. I used a 40' telescoping boom forklift, it will lift 6000 lbs. I was pulling them like daisys. I got most of the roots out that way. I kept it brush hogged low last year. I thought I had it licked. They have just started to sprout again. There are not very many but they are there. I bought a jug of Crossbow, Thinking that this would be the best thing to use and to lessen the kill off rate of the keeper locust.
What do you all think? Anyone have luck with crossbow, Killing Black locust? What else have you used with suscess? Please keep in mind that I have sections of old growth that, for now I want to Keep. Of course I know I may loose some of them...
What are my options for herbicides in the state of Michigan, W/WO a lisence? What is the blue chemical that the power co. is using(Asplaugh sp?) TIA...MTP

One thing,if the crossbow did kill the older locust trees-they could season out standing,and you can cut them down later-they should not rot standing.I would think the crossbow would kill the sprouts though.I know whenever I cut a locust tree down,sprouts do seem to come up,especially in a dry year.I usually keep bush hogging until they get the idea!Mark

32oz in 50 gallons of water will kill'em hammer dead.

The blue chemical is probably Tordon RTU (ready to use). Are they applying it to cut tree stumps? It's purpose is to kill those species of trees that will grow back from a stump like Hedge/Osage Orange. I think Black Locust is in the same category, but not absolutely sure.

Until I opened your post it I thought you were trying to make a crossbow out of black locust.

We have them sprout up in our yard. After mowing a few times it usually is the last of them

When I worked for Asplundh in Ne. we used Garlon the blue color was dye just so the power co. knew we actually used it

I forgot to add garlon is on target chemical, tordon is trans locational you could wind up killing more than the BL

Asplundh clears our power lines. On the large BL they put the stuff on the stump. On the other brushy areas they brought in a shreder. Then sprayed the mess they made. I don't like the shreder way of cutting. I don't know what they would say, if I said no more shreder. Thanks MTP...

I forgot to mention, that when they cut the stumps and treated them, I did loose some other BL. Would you think that was do to the common shared root system? Or Drift from them spraying? The bl that died would have been good post material, I didn't cut them, I have to much firewood as it is. I wouldn't use them for post as they died in the summer when fully leafed out. It seems like if they killed a bl with there process they should have to remove it also...MTP

I was surprized, that the roots left in the ground, suckered back out, this late in the season. Last year I was brush hogging so I was almost scalping the ground. Thanks MTP...

What can I say? I love the bl and I hate it...LOL. It does make some nice lumber. Alot of the stuff I have is to good for post. It looks more like log cabin material. Very large and straight without lower branches .MTP

It was RTU. They were treating the stumps. Would you think it would be strong enough to kill another large BL thatwas not cut? Thanks MTP...

Thanks Charlie, I read else where, to add more CB than they call for. Do you know what the % that 32oz to 50 gal of water is? That would be sprayed on the leaves? With stronger a % on fresh cut stumps? I also read to add diesel fuel and CB to kill the BL. Any one using diesel with there killer? Thanks again Charlie...MTP

Mark, I was always leery of using BL that was killed or died when the sap was up. I would hate to spend time and money on a fence only to have the post rot off early. Seems like the sugar would be locked in the post. That would give the micro organisms something to feed on. What does everyone think? Thanks again MTP...

I don't know about your power co. but here in Omaha Ne. the power co. is public owned so public relations was top priority if you didn't want it shredded we would have been hand cutting. It would be worth asking them not to shred I think.

Well,that is a good thought,but it seems I have used locust that died standing for posts,if they weren't rotten.But I never kept track of them either,so I can't say as to longevity.Mark