Aminopyralid and aminopyralid+triclopyr gave large and durable reductions up to at least 31 months.Responses also varied between herbicides (see graphs) Responses of giant buttercup to a single October application the herbicides differed between paddocks.Responses to synthetic herbicides and pre-graze mowing Herbicideįor product names of pasture herbicides with activity against giant buttercup click here. Repeated use of a single MOA is likely to result in resistance to that MOA and this possibly explains many of the poor results from farmers’ herbicide applications. They fall into four different mode-of-action (MOA) groups and some are damaging to clovers. There are seven herbicide active ingredients registered in New Zealand for controlling giant buttercup in pasture (table below). Many farmers find that giant buttercup is not well controlled by herbicides. The formulations tested in the experiment unfortunately proved ineffective. It can cause a disease that kills the buttercup plant including its rhizomes without any damage to pasture grasses and clovers. The common fungus, Sclerotinia sclerotiorum, is a natural enemy of giant buttercup. No evidence was found to support this idea. Gibberellic acid and nitrogenous fertilisers can promote the growth of pasture plants and have been observed by some dairy farmers to improve the control of giant buttercup when applied along with herbicides. Rather, it is probably due to the weed being promoted by the tread damage (pugging) associated with poor drainage through enhanced seedling recruitment and vegetative spread. The experiment showed that this is not due to any direct effect of soil wetness on the efficacies of the herbicides or mowing tactics that may be used. The on-farm experiment conducted under the sustainable Farming Fund project 'Control of Giant Buttercup' (July 2014 – June 2017) provided several insights into the control of the weed:ĭairy farmers find that giant buttercup is more difficult to control in paddocks with poor drainage. To aid decision making in the choice of herbicide to control giant buttercup, AgResearch has developed a web-based application for dairy farmers and consultants.
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