Control of Gambel Oak with Three Herbicides

Abstract

Fenuron, picloram, and 3 phenoxy compounds were applied to Gambel oak (Quercus gambellii Nutt.) to attain a complete kill of the plant. Spring treatments of fenuron applied to the soil at rates of 8 lb ae/acre or higher were effective as were fall applications. Picloram as a soil treatment was not effective. Foliar spraying with picloram and the phenoxy compounds at the higher rates killed oak crowns but not the plants. The herbicides varied in their injury to under-story vegetation.