Evaluation of Some Herbicide Treatments for Controlling Tall Larkspur

Abstract

Esters or the amine formulation of silvex and 2,4,5-T were equally toxic to tall larkspur. Repeated annual treatments with 2,4,5-T, silvex, dicamba, and picloram proved equally effective for controlling tall larkspur. Applications of 2,4,5-T (or silvex) at 4 lb/acre for each of two summers were the most economical of the various effective treatments evaluated.