clemsonfor: How long does the chemical kill yhe Kudzu for? The chemical I use along my fence lasts about 3-4 months. Then I gotta spray again.
The problem with the guy who says to dig it out with a boxblade and bobcat is that that wont work. For fairly young less established patches it will, but kudzu is deep rooted. It has rizomes (underground root structure, like a potato kind of), these can go down as far as 30feet on old plants.
Ok to ansewer your question. If you KILL it it will be forever. I agree there are better things than Glyphosate, we use transline, but tordone as well when i have it sprayed in a spot that has it bad i look after. The problem with any chemical u use it that nothing will be 100%. There will always be leaves that dont get chemical as there under others when you spray. The stuffs so hearty if u miss a few leaves it seems like that vine can still persist. Also it may just weaken the plants with large underground root structures (see above comment). But the next year these weaker plants come back they will either be new shoots or if you fail to cut the draping large vines they will be new runners off them. But the subsequent treatments are easy to control, you can handle them with a backpack sprayer in an hour or so walking an area meticuosly. It will take about 4 years of 1x a year treatments to just about eradicate an area. There was this one patch that was a few acres in size, some horribly infested some just in canopys. I had it sprayed about 3x and 99% of it killed. Each year i would ride and walk around and see less than 10 new shoots or tiny patches to respray. Its just a battle keep at it and you will win. But that first year you get 90% of it id say if you apply it at a good time. Meaning a few days following a rain, and in the day and also allow it a few days or 1 day till the next rain.
But like i said once a plant is killed its gone forever, its the ones you weaken and the ones you miss that will repopulate an area.
ALSO if you use your TRACTOR, you need to sanitize it after use in the kudzu. This means before you leave this tract you need to go over to a stump or the edge of your trailer, back your bushhog over and onto the side of it, lower it onto it to support it, then get under the bushhog and manually remove any portion of vines left on it. The small nodes on the vines can be dropped elsewhere and resprout if they get soil contact and moisture. This is why you see it all over roadsides as county road crew spread the stuff this way. The other thing you can do is if you dont feel like crawling under and pulling it, just leave it on the trailer or on the concrete for days in the sun till it dries out and definitly dies till you use that tractor on your place!!
Also for your fence. If your just talking weeds ond not kudzu, you need something that is soil active. Glyphosate does nothing once contacting soil. You need something with imazyapyr (trade name arsenol, i got some stuff at TSC with a weak formulation called barrier)in it, tordon, or velpar or something that says soil activity on the label.