What troublesome invasive weed do you have in your area?

Not where I live but up in the mountains many forrest areas have been decimated by the ash borer beetle. I'm having a terrible time getting rid of dollar spot or ringworm in my yard.
I've got dead ash all busted and hung up in themselves. The only thing holding some together is the huge poison ivy vines. Maybe 2"-3" in diameter. They are easy to cut off when like that but I can't get close enough now.
 
Dallisgrass is a real invasive nuisance. Had some it in my yard for the first time, but tried fighting it at our industrial unit. I wear gloves and rub Roundup onto to blades to kill them while minimizing collateral damage.

https://americanlandscapesllc.com/dallisgrass/


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This. And some other invasive (same thing?), hard to get rid of weed. This stuff laughs at Weed-B-Gone.

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Herbicides that will kill this will also kill the lawn. There's also something the locals call "water grass" (rhizomes) that's also hard to kill.
 
This. And some other invasive (same thing?), hard to get rid of weed. This stuff laughs at Weed-B-Gone.

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Herbicides that will kill this will also kill the lawn. There's also something the locals call "water grass" (rhizomes) that's also hard to kill.
In posting #18 I showed a picture of Quack grass which has Rhizomes. Only Roundup with glyphosate or equivalent can kill it ( but kills everything). I wonder if these plants are similar to each other.
 
Tenacity is a selective herbicide that will kill some problem grasses and not hurt cool season lawn grasses.

Tenacity herbicide is a safe weed killer for cool season turfgrass like Kentucky Bluegrass, Turf Type Tall Fescue, Fine Fescue, and Ryegrass. It is one of the best weed killers for lawns.

Weeds controlled (but not limited to) include the following:

  • Barnyardgrass
  • Bentgrass
  • Black Medic
  • Bluegrass annual (suppression)
  • Buckhorn Plantain
  • Buttercup
  • Carpetweed
  • Chickweed mousear
  • Clover largehop
  • Clover white
  • Common Chickweed
  • Crabgrass
  • Crabgrass large
  • Crabgrass southern
  • Creeping Bentgrass
  • Curly dock
  • Dandelion Catsear
  • Dandelion Common
  • Florida Betony
  • Florida pusley
  • Foxtail yellow
  • Galinsoga
  • Goosegrass
  • Ground ivy
  • Healall
  • Henbit
  • Lambsquarters common
  • Lawn Burweed
  • Lovegrass Tufted
  • Marestail
  • Nimblewill
  • Nutsedge yellow
  • Oxalis/Yellow Woodsorrel
  • Pigweed redroot
  • Pigweed smooth
  • Purslane common
  • Purslane speedwell
  • Shepherd's-purse
  • Smartweed pale
  • Smartweed Pennsylvania
  • Smooth Crabgrass
  • Sowthistle
  • Speedwell persian
  • Swinecress
  • Thistle Canada
  • Verbena
  • Wild carrot
  • Wild Violet
  • Windmillgrass
 
In posting #18 I showed a picture of Quack grass which has Rhizomes. Only Roundup with glyphosate or equivalent can kill it ( but kills everything). I wonder if these plants are similar to each other.
I'm thinking they are. The only local nursery that would have known went under years ago.

Once they start to take over your lawn, I think the only option is the nuclear one.
 
The worst is bittersweet. It kills trees and climbs pines 100 ft tall. The base root looks like a rope which I go around and cut with with my cordless chainsaw to stop it.

My neighbor hired a tracked machine(bobcat) to pull down with a saw/clamp on an elongated bucket on his property.
 
Made the mistake of planting mint in the garden last year. After weeding it out weekly, I’m hoping much of it is gone. It has tiny leaves relative to its roots.
 
Tenacity will knock it out without killing the good grass
Unfortunaly it's a native grass in the low wetlands here. The mower is what spreads it. No way could I eliminate it. 2 acers to treat if I were to do that. And it would need to be done annually until the dormant seeds are all sprouted.
 
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