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Overview |
Registration |
Plan Your Blackgrass/Grassweed Management |
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A crucial step to achieving successful control of headache grassweeds in winter wheat – blackgrass, ryegrasses and sterile brome, is to monitor when grassweeds emerge, so that post-emergence treatments can be applied as soon as possible when the weeds are small and are actively growing.
To help growers and advisers understand growth of these weeds, Dow AgroSciences is funding an ADAS monitoring scheme once again this season.
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If you would like to recive the latest GEM report directly to your inbox or would like to find out more about this service, please contact our Technical Hotline on 0800 689 8899, your local Dow AgroSciences representative or E-mail. |
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GEM first began in the autumn of 2010, and already some key factors influencing emergence patterns have been recognised - the rapid emergence of sterile brome being one of them. Sterile brome is most effectively controlled in the autumn when small.
This year we are hoping to monitor five representative UK sites in Cambridgeshire, Herefordshire, Oxfordshire, Wiltshire and North Yorkshire. As in previous years this will involve monitoring:
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Three sown major grassweeds: Blackgrass, sterile brome and Italian ryegrass (all sown 500 seeds/m2) and a 'natural' unsown blackgrass population.
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Two planned drilling dates - late September and late October - but this hasn't gone to plan!
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Report 5 - 22nd November 2012
Up until yesterday we have had two weeks of fairly consistent weather with average maximum temperatures around 11-12°C and average minimum temperatures around 3-4°C. All sites experienced frost on 18th and 19th. Soil temperatures (at 30cms) have risen slightly to just under 9°C.
A dry week in Cambridgeshire allowed more drilling to occur in the locality. It is now much wetter once again!
In Herefordshire there has been no further emergence of any species. Sterile brome is at 3-5 leaves and Italian ryegrass and blackgrass up to 1 leaf.
In Wiltshire sterile brome and Italian ryegrass continues to emerge steadily but blackgrass emergence has tailed off.
In North Yorkshire all species are at 1 leaf with no further emergence.
In Cambridgeshire there has been no emergence of any species as yet from a sowing date of 7th November.
All sown grassweeds are drilled at 500/m2
Please note all emergence is cumulative - early emergers will be getting bigger as grassweeds grow.
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Current advice for grassweed control in winter wheat:
Grassweeds are growing. Optimal timing for pyroxsulam-based products is when the weeds have germinated but before they get too large. Some fields which were drilled in September and early October are ready for treatment but difficult travelling conditions are preventing application or recommendations need to be changed. Dow AgroSciences are aware planned programme applications have been missed and have issued advice for controlling blackgrass here and bromes, wild oats and ryegrass here in what is a challenging autumn. Whilst you are waiting for conditions to come right take a look here at our experiences last year.
If grassweeds and crops are now at the correct stage for post-emergence treatment and you can travel, apply UNITE or Broadway Star.
Use UNITE where blackgrass is the driver-weed. For all grassweed situations, apply UNITE + adjuvant with a residual partner.
Use Broadway Star where ryegrass, wild oats and bromes are the driver-weeds. Add a residual as appropriate.
Learn more about UNITE
Learn more about Broadway Star
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It is important to remember that germination of grassweeds will also be subject to local factors and the information provided by GEM should supplement but not replace field monitoring.
