#8135. Pasture-Scale Evaluation of Postemergence Applications of Aminopyralid for Controlling Medusahead (Taeniatherum caput-medusae)

October 2026publication date
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Ecology;
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Abstract:
The exotic annual grass medusahead (Taeniatherum caput-medusae [L.] Nevski) has invaded millions of hectares in the western United States. The herbicide aminopyralid is an emerging tool for controlling medusahead. Aminopyralid reduces viability of grass seeds when applied just before seed production. In annual grasslands, desirable forage grasses generally begin seed production before medusahead, and applying aminopyralid when medusahead is still mostly vegetative but forage grasses have begun producing seed allows medusahead to be targeted somewhat selectively. In recent experiments, this approach reduced medusahead viability and cover to near zero and increased forage grasses. These experiments occurred in small plots, and results may differ in pastures if grazing or environmental heterogeneity causes plant stages to vary. Moreover, the results may prove highly sensitive to application timing. To address these information gaps, we factorially combined grazing and aminopyralid treatments in pastures and varied application timings in small plots.
Keywords:
aminopyralid; annual grasslands; forage production; herbicide; medusahead; Taeniatherum caput-medusae

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