ADVERTORIAL
RYEGRASS ISSUES MAPPED OUT
GEORGINA WOOD Syngenta Technical Manager and grass weed expert
IDENTIFYING THE SPREAD AND THE SEVERITY OF RYEGRASS WILL HELP TO PRIORITISE AGRONOMIC DECISIONS ON AFFECTED FIELDS, ADVOCATES SYNGENTA GRASS WEED SPECIALIST, GEORGINA WOOD.
“ Ryegrass is an increasing issue across most of the country, with some serious hot spots throughout East Anglia, particularly in Suffolk and Lincolnshire as well as Essex, Norfolk, Cambridgeshire and through to the midlands,” she warned.
“ AHDB research has shown ryegrass is more competitive than black-grass, resulting in greater yield loss, and it produces more seed heads with more seeds – which facilitates faster spread.”
Many of the measures successfully employed by growers and agronomists to manage black-grass, also have a beneficial effect in controlling ryegrass. But where growers have erred back to earlier drilling after consecutive challenging autumns, ryegrass in particular, has the ability to return more aggressively.
“ Precision farming tools, such as Syngenta Protector, now enables growers to map the extent of ryegrass populations within individual fields and to target agronomic decisions more accurately.”
Those decisions could include alternative rotations, more competitive cropping choices and how to prioritise farm workload, especially around drilling timing, to give the best chance of breaking the ryegrass cycle.
At the Syngenta Ryegrass Innovation Centre near Doncaster, for example, some plots were sprayed off with glyphosate in early December, and little or no further ryegrass germinated for the rest of the season. In addition to that, studies have shown that autumn germinating Italian ryegrass produces 23 times more seed than spring germinating.
This highlights the importance of the autumn pre-emergence herbicide programme. In herbicide work at the Doncaster site, the combination of DEFY®
at a full 5.0 l/ha, in mix with flufenacet + diflufenican at 0.6 l/ha, has consistently been the most effective treatment.
INTEGRATED MANAGEMENT
Syngenta trials across the UK have also shown the importance of combining a robust herbicide programme with cultural control methods. Trials with hybrid barley have shown an 88% reduction in ryegrass heads vs. winter wheat and 85% reduction vs. winter barley, in untreated situations. With the addition of DEFY + flufenacet + pendimethalin pre-emergence, complete control was achieved, with no need for any post-em follow up. Reducing the population through cultural means places less reliance on chemical options, reducing the chances of resistance to them developing.
“ Grass weed research across a range of species has reinforced the importance of accurate application and timing of the herbicide programme, along with the need to manage weeds throughout the whole farm rotation”.
“ The weather and other farm pressures can interfere with the best laid plans. Syngenta have developed the Spray Assist app to help you to optimise spray timing and nozzle choice on the go, to maximise application success”
RYEGRASS AGRONOMY ACTIONS
• Identify the scale and severity of ryegrass population in fields
• Map populations to track changes and spread • Test for herbicide resistance if concerns over control • Plan cropping to drill worst fields later • Focus on autumn actions to achieve best control
BLACK-GRASS DORMANCY SETS SEASONAL DECISIONS
MAPPING RYEGRASS POPULATIONS IN EARLY SUMMER WILL BE AN IMPORTANT FIRST STEP IN ACHIEVING MORE EFFECTIVE WEED MANAGEMENT STRATEGIES THIS AUTUMN.
A BETTER UNDERSTANDING OF BLACK-GRASS DORMANCY COULD ALLOW ADJUSTMENTS IN GRASS WEED AGRONOMY THIS SEASON, TO MAXIMISE CONTROL.
Download new Syngenta Spray Assist with added improvements
Syngenta UK Ltd. Registered in England No. 849037. CPC4 Capital Park, Fulbourn, Cambridge CB21 5XE. Tel: +44 (0) 1223 883400 Technical Enquiries: +44 (0) 800 1696058 Email:
customer.services@
syngenta.com.
is a Registered Trademark of Syngenta Group Company. DEFY (MAPP 16202) contains prosulfocarb. All other brand names used are trademarks of other manufacturers in which proprietary rights may exist. Use plant protection products safely. Always read the label and product
DEFY®
information before use. For further product information, warning phrases and symbols refer to
www.syngenta.co.uk. ©Syngenta UK Ltd. May 2021. 11486
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