The Bonide Stump Out Stump & Vine Killer woks mostly for stumps. For this case, its better to use something like Sucker Punch Ready to Use is a plant growth regulator specially designed for use on ornamental trees and other woody plants.
We apologize, but there is nothing on the product label that shows that the Bonide Stump Out Vine Killer will treat for Holly Volunteers. Please contact your Cooperative Extension Office and speak with the Master Gardener on duty for more specifics on this issue.
http://npic.orst.edu/pest/countyext.htm