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There is ubiquitous and widespread resistance in blackgrass


in 16 field trials where drilling was delayed for a month, says Mr Cussans. Growers should refrain from drilling crops until mid-Oc- tober, he suggests.


Impact of rain “On average, every week drill- ing is delayed in autumn there’s a 15% decrease in blackgrass. We’ve not yet had a year when delaying drilling from September to October hasn’t reduced black- grass plants – even in those years with low rainfall.”


The highest levels of control


the seeds are within the soil pro- file, is vital information for select- ing the most appropriate weed management strategy.”


Delayed drilling remains a key strategy in the battle to con- trol blackgrass. There was two thirds reduction in blackgrass


were achieved where there were high levels of rainfall between the early and late drilling dates. Where there was low rainfall be- fore or around the first drilling date blackgrass germination was suppressed and control reduced. “You can’t spend your way out of early drilling,” says Mr Cuss-


ans. “Delaying drilling coincides with better performance of pre- em herbicides – the increased chance of rainfall, increases the likelihood of conditions facilitate improved take-up of residuals.” Trials suggest the same out- come can be achieved by drilling mid-September and applying Crystal (flufenacet and pendi- methalin), Hurricane (diflufeni- can), Lexus (flupyrsulfuron) and Avadex (tri-allate) – or by wait- ing 3-4 weeks until mid-October and just applying Crystal alone.


Cultivation choice


The best control comes from a mix of strategies. Achieving 70% control is relatively cost-effective with herbicides. But achieving 97- 98% control, which is needed to reduce populations significant- ly becomes disproportionality expensive with herbicides alone. Cultivation decisions should be guided by how much black- grass there is and where it is in the soil profile. Where fresh seed is on the surface, ploughing can continued on page 22


Our British designed drill outperforms others in typical British conditions. Figures.


This green and pleasant land can be awkward. So Claydon drills are designed and proven to establish crops in unpredictable and increasingly extreme conditions. From ‘miserably wet’ to ‘dust bowl dry’, Claydon drills keep performing when other machinery just can’t cope.


Call a Claydon drill expert now on 01440 820327, before it rains. www.claydondrill.com


+44 (0) 1440 820 327 info@claydondrill.com


Establishing a better way SEPTEMBER 2020 • ANGLIA FARMER 21


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