Arnold from Anton Chicop, Nm writes
fence rows with blacklocust and siberian elm round up pro max 48% doesn't seem to be working at app 3% dilut
Black Locust in particular is very difficult to control because of its aggressive growing. RoundUp or other Glyphosate products may work on young seedlings, but mature trees should be treated with a bark spray or treatment to fresh cuts with an herbicide with Triclopyr such as Crossbow Herbicide or Garlon 4. This article from the California Invasive Plant Council offers more information.
Answer last updated on: 10/13/2016