There is a product called Tordon RTU. The 'RTU' part means 'ready to use'. It is formulated to be painted onto the freshly cut surface of woody trunks/stems. The product is than absorbed into the vascular cambium and is transported to roots which subsequently die. It is very effective - only 1 application needed.
Cut stems with a lopper or saw, use a foam paint/stain brush to apply to wound. All done. No mess, overspray, or wind drift.
Al