Eight herbicide treatments were applied by low-volume basal applications and compared to hand cutting for the removal of Ailanthus altissima. Manual cutting of Ailanthus stimulated resprouting and increased overall stand density. Chemical control not only removed existing trees but also prevented resprouting.
When evaluated two years after treatment, optimal control of Ailanthus was achieved with a combination of Garlon 4 and Tordon K herbicides. Garlon 4 at 20% v/v alone, Garlon 4 combined with Stalker, or Stalker herbicide alone controlled Ailanthus better than hand cutting but were not as effective as treatments containing picloram. Removal of Ailanthus resulted in a shift in herbaceous species to native species of the region without reseeding with naturally occurring herbs.
Manual control of Ailanthus should be avoided in order to prevent proliferation. Herbicide control of Ailanthus is the preferred method of control because it successfully kills the trees and prevents resprouting... Because major Ailanthus infestations occur near roadways, access with a backpack sprayer should be achievable.