Observations: Potential Long-Term Environmental Impact of Tebuthiuron and Its Metabolites in Utah Juniper Trees

Thomas N. Johnsen
1992 Journal of range management  
The concentrations, distribution, and longevity of tebuthiuron (N-[5-(l,l-dimethylethyl)-1,3,4-thiadiazol-2-yl~~,~'-dimethylureaf and its metabolites in Utab junipers [Jun@erzu osteosperma (Tot-r.) Little] killed by tebuthiuron are not known, causing concern about potential residues and their release into the environment from decaying plants or burning wood. Utah juniper trees killed by tebuthiuron at 3 north-central Arizona locations were assayed for tebuthiuron and its metabolites by gas
more » ... bolites by gas chromatography with flame photometric detection. Foliage, twigs, stems, and litter from recently killed trees averaged 13.3 f 0.4,0.4 f 0.1, 0.4 f 0.1, and 4.0 f 6.6 mg/kg of tebuthiuron plus its metabolites, respectively. Dead stems averaged 0.5 f 0.4 mg/kg in sapwood, 0.1 f 0.1 mg/kg in heartwood, and 0.4 f 0.7 mg/kg in bark, 3 to 9 years after application. Root bark averaged 1.1 f 1.9 mg/kg, and root wood averaged 0.5 f 1.4 mg/kg. Although long lived, these small tebuthiuron residues should have little potential environmental harm if treated Utah juniper wood is used as firewood or fence posts.
doi:10.2307/4002777 fatcat:7hsesype3ffnlcmzl5xe25375i