Abstract
A 4-yr field study was conducted near Grassrange, MT to determine the effects of single and repetitive picloram treatments for leafy spurge control in a native pasture. Single applications of picloram at 0.28, 0.56, 0.84, and 1.12 kg ae ha–1averaged 0, 5, 22, and 61% leafy spurge shoot control 3 yr after treatment. Only the single applications of picloram at 1.68 and 2.24 kg ha–1maintained leafy spurge control above 80%. A retreatment with 0.56 kg ha–1picloram was required to maintain effective control for 3 yr when less than 1.68 kg ha–1was applied. Leafy spurge canopy cover in the 1.68 and 2.24 kg ha–1treatments averaged 14 and 6% 3 yr after treatment; however, all other single applications required retreatment.
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