Blog •  06/10/2021

Don’t cut corners this autumn

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By Alister McRobbie, Category Manager for Cereal Herbicides at Corteva Agriscience.

As soon as harvest is over, it’s time to start thinking about next year’s crop. There’s no let-up in farming – no sooner has the last lorry full of grain left the farm, then it’s back to the drawing board to start thinking about drilling.

Growers should also start to plan their weed control sooner rather than later. Grass-weed control is often the priority for the autumn, but control of difficult broad-leaved weeds should not be forgotten. It’s all too easy to think “that can wait until spring!”.

However, come spring I can guarantee you will think back to this moment and wish you’d saved yourself some work by taking early action.

Controlling broadleaf weeds such as cleavers, chickweed and fumitory when they’re small is always the easiest tactic to take, if conditions allow. The chemistry you choose will be more effective and will stop weeds in their tracks before they have a chance to really get going. Waiting until spring is tempting, but by that point they will be more difficult to control and you will regret not taking action earlier. There is also always the risk that weeds could develop resistance towards the chemistry you use if you wait until they’re considerably larger.

In this instance, we recommend the use of a herbicide which suits variable conditions – fluctuations in temperature from day to night have already begun and will only become more distinct as we advance towards winter.

Our herbicide Zypar® contains Arylex™ active chemistry, which is proven to continue working on broadleaf weeds in cold and variable conditions.

Unlike other growth regulator herbicides, Arylex isn’t significantly influenced by temperature, so you can seize back control regardless of whether it’s freezing cold or warm. It also delivers superior efficacy at low dose rates, setting it apart from other synthetic auxin herbicides.

As little as five to 10 grams of active ingredient per hectare after emergence can effectively control the most common broadleaf weeds. If, however, you suspect ALS resistance in poppies, you should consider an application of pendimenathlin in the autumn, to ensure effective control.

Zypar is a premix of Arylex and florasulam, and can be applied at up to 1L/ha. It can be applied to all cereals, apart from oats, in autumn and spring. Spring application is allowed from BBCH 13 until BBCH 45, however the best performance is reached up to BBCH 32.

So get ahead and save yourself a big job next year – tackle broadleaf weeds before they find their feet and ensure spring gets off to a running start.


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