Get your weeds under control

Get your weeds under control

Weed competition can have a significant detrimental effect on brassica yield from very early on in the growing season. Corteva™ Agriscience has farmers covered with a suite of post-emergence forage brassica herbicides that provide a solution for all situations and have made their mark as reliable and trusted options in this category.


Milestone is the newest forage brassica herbicide from Corteva Agriscience, having been approved for use in New Zealand in 2019. It replaces T-Max in this crop.

Milestone contains two active ingredients – aminopyralid at 60 grams per litre (g/L) and clopyralid at 276 g/L. Both are well-recognised and widely used, and there is no other formulation of this type registered for use in forage brassicas in New Zealand.

The biggest benefit of Milestone when compared to T-Max is crop safety – this was a key focus during the development stage of the product. In developing this new formulation, Corteva have been able to improve the safety of the product, which is fantastic. T-Max has a strong following, and works well, but it’s been known to cup crops and cause a growth check which can look pretty severe in the early stages of establishment.

Milestone has some very significant advantages in that respect, and through multiple crop safety trials, it has proven its strength in this area.

Milestone is also the ultimate solution for hard to control weeds in forage brassica. Its broad spectrum includes difficult weeds such as amaranthus, spurrey, water pepper, thistles and many more.

It’s a double-strength formulation as well, so recommended rates are half that of T-Max, with some nice handling, mixing and storage benefits for everyone in the supply chain.

So where does Milestone fit?

In general terms, anyone who has been using T-Max up until now can make a straight upgrade to Milestone. It’s also the perfect solution for anyone who is looking for a product that delivers broad-spectrum weed control in forage brassica, without impacting crop health.


Another forage brassica herbicide with a unique package of benefits is Korvetto. It combines Corteva Agriscience’s new active Arylex (Group O3) with the trusted chemistry of clopyralid (Group O4).

Launched in spring 2018, Korvetto combines fast plantback with best-in-class control of common weeds such as fathen, nightshades and Californian thistles as well as hard to kill weeds like shepherd’s purse and fumitory. On top of this, it offers superb crop safety.

A standout feature is the short plantback. Korvetto is the most flexible post-emergence herbicide for brassicas, with a three-month plantback for clover and six-month plantback for fodder beet.

It allows farmers a lot more freedom when planning subsequent crop rotations to get the best out of their land. This is particularly helpful in summer crop scenarios going back into clover-based pasture in autumn. Other herbicides with clover plantback of nine months or more can dramatically reduce clover performance in the new pasture.

Plantback periods for maize, cereal, ryegrass and forage brassicas are nil, while vegetables and legumes other than clover are six months.

Korvetto’s Handling benefits include an in-built methylated seed oil (MSO) adjuvant, so there’s no need to add a surfactant to the mix. It’s also low in odour as the NeoEC formulation contains no petroleum distillates.

Grazing withhold is 14 days. Korvetto is rainfast one hour after application and compatible with commonly used grass weed herbicides and insecticides.


Radiate has been a reliable option for many years, with a narrower weed spectrum. Still, it continues to fill a useful role as a low-cost herbicide option if you are just dealing with fathen and nightshade.

All the Corteva forage brassica herbicide range can be applied via ground or air, which is another important benefit and offers flexibility when conditions don’t suit.

For more information on the range of Corteva forage brassica herbicides, talk to local Farm Source TSR or visit your Farm Source store.

Article supplied by Corteva