Arable
consider with a late autumn post-em
5 things to S
ettled weather is provid- ing an opportunity to con- trol problem weeds with contact-acting herbicides before they get out of hand. Darren Ad- kins of Bayer outlines fi ve tips for late autumn sprays.
1 Check weed levels Many October drilled crops went into wet or less than ideal seed- beds, leading to slow establish- ment and lower pre-em effi ca-
cy. Drilling was the priority, so the pre-em programme was of- ten delayed or missed altogeth- er in some cases. Wet and cloddy seedbeds both affect pre-em performance so many crops have fairly high weed levels in need of control. Earlier-drilled wheat is also likely to have grass weed pres- sure despite good establishment and good conditions for the pre- em.
2 Control blackgrass Small plants with 1-2 leaves are typically more susceptible to post-em sprays like Atlantis OD (mesosulfuron + iodosulfuron) and Hamlet (mesosulfuron + io- dosulfuron + difl ufenican). At early growth stages, the dose of active can overcome met- abolic resistance, whereas large plants in spring are more able to survive. Maximising blackgrass control will pay dividends by im-
warranty* 5-year *Manufacturer’s warranty on fans only.
Metabolic resistance can be
overcome at an early blackgrass growth stage
proving yields and reducing seed return for future seasons”
3 Protect against further germination With the trend to milder win- ters, weeds can continue germi- nate even in December and Janu- ary. Applying additional residual herbicides, mixed with the post- em or as a standalone top up will give crops added protection.
4 Effective application Apply a fi ne–medium spray to a dry or drying leaf with plenty of drying time before dew forma- tion. Active growth is important – be wary of applying when tem- peratures drop close to zero as weeds may become dormant and not take in the herbicide.
5 Check BYDV risk
Returning to the crop to apply a post-em may be an opportunity to use an aphicide to control aphid vectors of barley yellow dwarf vi- rus if there is risk. Use the T-Sum calculator and walk crops to de- cide if you need to spray.
01621 868 138 |
agricultural@gibbonsgroup.co.uk |
www.gibbonsgroup.co.uk Woodrolfe Road, Tollesbury, Maldon, Essex CM9 8RY
10 MIDLAND FARMER • DECEMBER 2020
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