Herbicides that contain glyphosate or triclopyr amine are effective at killing trees and available at garden stores. Your species may respond to one of these more than the other. For example, glyphosate may do a better job controlling Russian olive, while triclopyr is the better choice for locust, maple, oak, and willow.  Triclopyr amine should work at concentrations of 8.8%. For glyphosate, try to find a concentration of about 40%, then dilute with an equal amount of water. If that isn't available, apply undiluted product with at least 20% concentration.  Herbicides containing 2,4-D, dicamba, or picloram are risky, as they may spread to nearby vegetation and kill it as well. This shouldn't happen with careful application of glyphosate or triclopyr. Follow the herbicide label instructions to prevent dangerous exposure to the chemicals. At minimum, wear long sleeves and pants, closed-toe shoes, latex or nitrile gloves, and safety goggles. Choose clothes you don't mind ruining. You do not need to wear a mask, since you will not be spraying herbicide into the air.
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