New Teridox strengthens weed control for oilseed rape

A new residual herbicide option for oilseed rape this autumn will help growers to overcome restrictions and limitations with existing herbicide strategies. Teridox from Syngenta offers a similar weed spectrum to metazachlor, but with a different chemical structure – providing a cost-effective alternative or options to bolster weed control in the rotation.

Syngenta Oilseed Rape Technical Manager, Chris Charnock, advocates Teridox use for a wide range of broad-leaved weeds and some key grass weed species. “The highly competitive Chickweed, Red dead-nettle, Mayweeds and Groundsel, for example, are all extremely well controlled.

“And as straight dimethachlor, Teridox is an ideal opportunity to tank-mix with combinations of other pre-emergence herbicides. Their rates can be tailored to the specific weed threat for individual crops,” he added.

Mr Charnock highlighted that dimethachlor is the cornerstone of many weed control strategies for oilseed rape growers across Europe, most frequently as pre-formulated mixes with napropamide and clomazone. “In the UK, growers and agronomists have the flexibility to tank-mix these combinations of actives to their own situations. Stacking these herbicides is a useful technique to aide grass weed control,” he advised.

With current concerns over pre-emergence herbicide residues in groundwater, leading to recent changes in metazachlor use recommendations, for example, he believes it makes practical sense to limit the repeated use of any one active, and to prioritise their applications where each is most effective.

Teridox can be used once every three years in the rotation as a pre-emergence treatment, which makes an ideal complement to the existing chemistry options for most growers. Pre–emergence Teridox can be followed with applications of metazachlor mixtures in the same crop, if required. It can also be alternated with metazachlor if rape is grown more than once every three years in the rotation.

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