Key Points
- There are no herbicides currently registered in NZ for weed control in buckwheat.
- A trial to determine the phytotoxicity effect of a range of herbicides was established in the 2003/04 season in mid Canterbury under both dryland and irrigated conditions.
- Sethoxydin (Poast), applied at 2 l/ha, caused neither a phytotoxic effect nor any yield reduction.
- Phenmedipham+desmedipham (Betanal), 2,4-D and MCPB all caused moderate phytotoxicity but did not reduce yield.
- Mecoprop (Duplosan KV) caused high levels of phytotoxicity but only reduced yields in the dryland trial.