I will have to spray this year, multiple times, to kill any growth from the roots the mulcher didn't tear up.
I should say, the only kudzu I had was among these trees that were mulched. I plan to eradicate with the mulching (done in April so it didn't seed yet) plus the spraying. It just appeared three years or so ago.
They would convert that to fertilizer over a weekend.
Sorry I didn't read farther before I asked about herbicides. My bad.