I'd mulch em too. Don't get it to trunk- leave little space. I haven't mulched many yet cause of time. Will be though. Friend of mine uses lime stone which is a good idea. 3 T posts around tree with regular cattle fence that's wired on really well- works great. Or some fencing with the smaller holes so no rabbits can get past is better yet even though screen covers trunk.
The residuals I'm spraying around mine- I do have a pretty darn good cocktail that covers the spectrum. I've got all these on hand from crops and native grass plantings, etc. But I do so much with trees i simply order these every year from coop & online. Plateau or Panoramic (used for native grass plantings). Atrazine. Dual or Warrant. Add one more like prowl or surflan. That's just me though. It's several things of course but every Herbicide misses some things and this seems to cover it all for me.
Skip, so you mix Plateau + Atrazine + Dual + Prowl and spray around bases of trees.....and this keeps things pretty clean for the entire season?
For making it a little simpler.... I would do 3 Herbicides for residual. These 3 are NOT restricted, you can order 2.5 gallons (or smaller) online all over. Hands down I'd do: SIMAZINE (Princep), Prowl & Surflan. Obviously carefully looking at your post emergent (round-up for example applied while dormant & I still am careful around tree for whatever reason). You apply a good healthy rate- you will have everything controlled from grasses to Pigweed/waterhemp to all sorts of broadleaves, etc. Great combo especially for folks wanting simplicity and not having a Restricted use permit.
Oh, pears, I do some ACN but they don't have several varieties. Might want to do a little research, here's what I've been ordering and mostly due to disease resistance and Kieffer dropping a little bit later....
Ambrosia
Delicious
Maxine
Moonglow
Kieffer (is mod resistant to FB)
Seckel