The highway or ROW crew may have sprayed it with picloram or something very potent like it. But it requires a herbicide license to apply it which means taking a test and paying a recurring license fee to keep the license active.
Part of the difficulty is finding an effective herbicide and then being able to buy and use it.
Regular glyphosate that doesn't require a license means repeated sprayings in my experience. If someone can recommend a herbicide that is effective on kudzu, please share.
This pond area was mulched for several days with a forestry disc mulcher on a compact track loader 6 months ago. However, the land owner hasn't done anything to control the kudzu in the last 6 months. The area has grown back up because the well established root and tuber system is still there and reproducing new vines. I sort of suspected they thought they had beaten the kudzu when they had it mulched, but ....
It almost seems like when you knock down kudzu in an area, it comes back two or three fold. So you have to be prepared to follow up with additional control measures.
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