Corteva Agriscience says crop protection products targeted at eliminating key problem weeds can be applied earlier than usual where active growth can be identified. 

However, growers are advised to ensure programmes cover the full spectrum of weeds. 

“Those who have used cinmethylin-based products for the first-time last autumn will have been predominantly aiming to control blackgrass and ryegrass,” says Alister McRobbie, Cereal Herbicides Category Manager for Corteva.

“But it is important to look out for the other key weeds which may already be present or will emerge in the coming days and weeks. Cinmethylin will not control every weed that grows in amongst the crop.” 

Met Office data shows temperatures in September, October and November – the key months for winter cereal drilling and emergence – were above the long-term average. 

However, December and January saw cold snaps, frosts and localised flooding which has checked some crops. 

“The net result is that most winter cereals went in the ground in favourable conditions and emerged well,” Alister says. 

“Farmers who avoided the worst of the recent heavy rain and flooding will be pretty happy with how their fields are looking.” 

Autumn residuals had the optimum environment to do a good job, but a spring clean of weeds will still be necessary. 

 Broadway Star is a mainstay of spring weed control programmes and will be among the first products applied if an early opportunity to get sprayers working presents itself in February. 

It gives excellent control of brome species, ryegrass, wild oats and a range of broad-leaved weeds in winter wheat and also has approval for use in spring wheat.

“Early applications for sterile brome control will benefit from tank mixing with pendimethalin to provide some residual control where there is potential for further germination,” Alister added. 

Broadway Star also controls a range of difficult broad-leaved weeds, including cleavers, charlock and cranesbill, so there is usually no need for a broad-leaved weed follow up spray. 

 The product label specifies a maximum rate of 265g/ha and a single application per crop. It can be used on crops between growth stages 11-32 inclusive.