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| Department of Agriculture, Aquaculture and Fisheries |
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Abstract: Calendula (Calendula officinalis) is a potential new crop for New Brunswick producers. One limitation to
commercial production is a lack of registered herbicide options. A trial was initiated near New Denmark, New
Brunswick to evaluate in–crop herbicides for weed control in calendula. As trifluralin was broadcast over the
experimental area prior to plot establishment, weed control ratings may not reflect the potential weed spectrum in the
field. Overall, emergence in the plot area was quite variable, which may influence the results presented. Low crop
injury was shown for trifluralin, fluazifop and sethoxydim. As the season progressed, injury ratings improved for
glyphosate alone and, to a lesser extent isoxaben. Glyphosate application was made at 30% plant emergence, which
was late for crop safety, although the plots recovered by the end of the trial period therefore glyphosate or trifluralin
treatment were the best options to provide adequate weed control as well as adequate crop safety.