G.L. Graham and G. Chiasson
Abstract: Smooth bedstraw (Galium mollugo) is becoming a serious weed in pastures, hayfields and field margins
across the Maritime region. It is typically found in acidic, low fertility areas but is moving into intensively managed
areas. A trial was initiated near Bathurst, New Brunswick to evaluate herbicide control options, with application made
two weeks after forage harvest. All rates of triclopyr and aminopyralid tested offered consistent control of smooth
bedstraw in the season of application and into the season following application. The addition of 2,4–D amine to
aminopyralid did not improve control. MCPA amine, mecoprop/MCPA/dicamba, 2,4–D amine and
carfentrazone–ethyl demonstrated early activity on the weed but the effect dissipated in further evaluations.
Triclopyr and aminopyralid significantly improved grass species ground cover in the year following application. The
cost and control of aminopyralid and triclopyr should be evaluated further in the Maritimes, especially in comparison to
glyphosate application followed by fertility and re–seeding treatments.