Junipers (Juniperus spp.) and pinyons (pinus edulis Engelm.) are reinfesting areas from which they have been removed and are encroaching into other areas. Controlling these trees while they are small would help maintain forage production and protect the soils. Individual trees can be controlled by applications of pelleted picloram (4amino-3,5,6-trichloro-2-pyridinecarboxylic acid) and tebuthiuron [N-[5-(1,l-dimethylethyl)-l,3,4thiadiazol-2-yl]N-N-dimethylurea), but little is known of the comparative effectiveness of these herbicides on junipers and pinyon. We compared pelleted picioram and tebuthiuron on individuai alligator juniper (J. deppeana Steud.), one-seed juniper [J. monosperma (Engelm.) Sarg.], Utah juniper [J. osteosperma (Torr.) Little], and pinyon. Pellets were applied at 0.7 and 1.4 g picloram acid equivalent (a.e.) or tehuthiuron active ingredient (a.i.)/m of tree height at 3 Arizona and 3 New Mexico locations. Utah juniper and pinyon trees up to 2 m tall were killed with 0.7 g picloram a.e. or tebuthiuron a.i./m of height. One-seed junipers up to 2-m tall were killed by 0.7 g tebuthiuron a.i./m of height, but were not by picloram. Neither herbicide killed alligator juniper consistently. Some understory grasses were damaged more by tebuthiuron than by picloram. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020
Scholarly peer-reviewed articles published by the Society for Range Management. Access articles on a rolling-window basis from vol. 1, 1948 up to 5 years from the current year. Formerly Journal of Range Management (JRM). More recent content is available by subscription from SRM.