Abstract
This study was conducted at two western Oregon sites: a hill-pasture near Coquille (Site I) which could be managed for either timber or forage but which was being used for grazing at the time of the study, and (2) a hill-pasture near Corvallis (Site II) suited for grazing. Site I is near the Oregon coast. Site II is in the Willamette Valley. At Site I, triclopyr (3.4 kg acid equivalent/ha with 1.2 L polyglycol surfactant and enough water to give 93.5 L/ha total solution) was applied as the isopropylamine salt on May 24 by helicopter to 2.5-ha which included all of a 1.74-ha watershed. The site averages 34% slope and has Etelka (1 to 2% organic matter) and Whobrei (2 to 5% organic matter) silt clay loam soils. There was no buffer zone along the intermittent stream, which is quite small and does not flow during summer.
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