Cropping

Know your limits

By Country News

Canola growers are being reminded to abide by herbicide labels as part of an industry-wide effort to avoid unacceptable chemical residues.

The appeal from National Working Party on Grain Protection chair Gerard McMullen is reminding growers that herbicides containing haloxyfop as the active ingredient have label directions that stipulate they must not be applied to canola and other specified oilseed crops after the eight-leaf growth stage, after the stem elongation growth stage has commenced or under or between windrows.

Mr McMullen said residue testing by the National Residue Survey had detected haloxyfop residues above the Australian maximum residue limit in canola traded domestically, which is of concern.

‘‘Growers are also encouraged to consider other herbicides containing products with different active ingredients for in-crop control of grass weeds in canola,’’ he said.

According to Mr McMullen the European Union has indicated it plans to lower its current haloxyfop MRL for canola to 0.05mg/kg.

‘‘Australian grain growers have a very good history of compliance with product label directions and, as an industry, we need to ensure that haloxyfop continues to be used in accordance with label directions,’’ he said.

GRDC crop protection officer Georgia Megirian said applying haloxyfop to canola after stem elongation would result in chemical residues that exceeded maximum residue limits/.

‘‘This, in turn, can lead to the rejection of canola shipments in export markets and create ongoing market access issues,’’ Ms Megirian said.

‘‘Following label directions is not only a regulatory requirement, it is also important in preserving haloxyfop herbicide chemistry as a cost-effective grass control option for canola growers across the country.’’