Attenuation and Effectiveness of Triclopyr and 2, 4-D Along Alaska Highway Right-of-Way in a Continental and a Costal Subarctic Environment

Final; 8/1/2010-12/31/11.PDFTech ReportFHWA-AK-RD-12-04INE/autc 09.11T2-07-06DTRT06-G-0011AUCT # 1070243238-332854-680944537-591103-68094HerbicidesVegetation controlHighway maintenanceFrigid regionsEnvironmental monitoringGas chromatographySpectrophotometryField testsAlaskaAlaska University Transportation CenterBarnes, David L.Seefeldt, SteveAlaska University Transportation CenterAlaska. Dept. of Transportation and Public FacilitiesAlaska. Dept. of Transportation. Research, Development, and Technology TransferUnited States. Federal Highway AdministrationNTL-ENERGY AND ENVIRONMENT-Environment ImpactsNTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATIONNTL-HIGHWAY/ROAD TRANSPORTATION-Construction and MaintenanceNTL-OPERATIONS AND TRAFFIC CONTROLS-OPERATIONS AND TRAFFIC CONTROLSUS Transportation CollectionAfter more than 20 years of only mechanical brush cutting, ADOT&PF evaluated the use of herbicides to manage vegetation that interferes with line-of-sight andmaintenance of the roadway. While researchers have investigated herbicide effectiveness and attenuation in more-temperate climates, little study has focused on coldregions. The purpose of this project was to measure the effectiveness and attenuation of two different selective auxin-type herbicides, 2, 4 dichlorophenoxyacetic acid(2,4-D), and 3,5,6-trichloro-2-pyridinyl acetic acid (triclopyr) in two subarctic climates; an extremely cold continental climate and a maritime climate. Conclusions fromthis study will aid the ADOT&PF in developing a plan for controlling vegetation along highway rights-of-way in Alaska