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Blackgrass control in Winter Wheat this January/February
 After the unseasonably mild start to January, colder weather has set in. Therefore conditions for the optimum efficacy with applications of ALS chemistry are not ideal, but action as soon as practical can help to achieve good control this spring. Many crops have not received any herbicide treatment in the autumn but on the plus side blackgrass will be small coming into the spring. Colder conditions may present some opportunity for application of residuals to help manage the blackgrass and keep it in check. This will help provide timing flexibility with follow-up treatments of UNITE® when the weather turns mild again. This cropping year has already presented considerable challenge. Download our latest topic sheet to find out more about controlling blackgrass now in winter wheat. Learn more about UNITE
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Brome, Wild oat and Ryegrass Control in Winter Wheat
Just like fields where blackgrass control is the main priority many herbicides targeted at these key grassweeds may have been missed in the difficult autumn. There’s much field work to be done; grassweeds will need control and with lack of autumn residuals, broad-leaved weeds will also be an issue meaning Broadway® Star will be an excellent choice for herbicide programmes. |
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Complete applications of Kerb
 Any winter oilseed rape fields still to be treated with Kerb® Flo 500 must have applications made before the latest allowable time of application - 31st January. Where applications of Kerb Flo 500 were planned last autumn, but delayed due to water logging or backward crops applications must be completed before the 31st January. Crop selectivity for propyzamide is by depth protection of the roots. Applications to very small oilseed rape plants can cause problems such as stunted growth with leaves fused to the axil or stem and yield depression. Once a crop has reached the three true leaf stage the roots are at sufficient depth to not take up a dose of propyzamide that could cause problems. Some judgement may be needed in backward crops as to the risk on any smaller plants and on shallow rooted areas. Dow AgroSciences’ research confirms that worthwhile levels of blackgrass control, and other grassweeds, can still be achieved even from January treatments with Kerb Flo 500. Although Kerb may be applied in a frost, the temptation of using frozen ground as a means of access should be resisted if rain is forecast in next few days. A very light covering of snow on a flat field would not be a problem but blanket coverage would be a no no. Please do everything possible to prevent applications of propyzamide reaching watercourses.
There is currently no known strain of blackgrass exhibiting any degree of resistance to propyzamide. Dense Crop Canopies If you are in a fortunate position to have a well-established crop you may be concerned the canopy will impair herbicide performance. To ensure our advice is current and correct and in response to concerns in 2011 about the efficacy of Kerb Flo against denser than average crop canopies, trials were conducted in Europe to identify the impact of fuller crop canopies on propyzamide efficacy. Results confirmed no difference in blackgrass control between plots where the canopy was intact and where the canopy was removed and therefore where crop canopies are dense, propyzamide was still just as effective. Crop Failure Due to slugs, pigeons and slow growth so far, some are thinking ahead as to spring cropping options just in case the rape does not pull through. Options after a November application of Kerb Flo 500 include April drilled spring oilseed rape after ploughing at farmers’ own risk. Following crops of beans or peas need a 10 week interval after application of Kerb Flo 500 to previous oilseed rape. Do not apply Kerb now to crops that are likely to fail as following crops are very limited. |
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How do I use Spitfire for early season cleaver control?
When spraying for grassweeds many farmers want to control cleavers (and other broad-leaved weeds) at the same time. This spring, using Spitfire® instead of Boxer® or amidosulfuron straights/co-forms presents a new improved, robust approach to early spring weed control. For early season cleaver control with ALS graminicide tank-mix Spitfire at 0.5 L/ha (to replace 50 mls/ha of Boxer, or amidosulfuron straight/co-form), or tank-mix 0.6 L/ha Spitfire (to replace 75 mls/ha Boxer, or amidosulfuron straight/co-form). This approach will:
Spitfire will also give control of wide range of additional weeds keeping weed control simple, delivering piece of mind. It is also exceptional value for money. Learn more about Spitfire
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Wheat Bulb fly Pestwatch now on twitter
Pestwatch reports are now on twitter. Sign up now. Follow @DOWAGROUK Egg-hatch has just started in East Anglia. This spring all applications of Dursban® WG or Equity® for Wheat Bulb-fly should adhere to stewardship advice in Say NO To Drift stewardship campaign for conventional boom sprayers:
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BASIS Points
Subscribing to Dow AgroSciences' Agronomy Update & Pestwatch gives eligibility for 1 Crop Protection BASIS Points annually. Please include course name "Agronomy Update & Pestwatch" and the number "CP/24531/1213/g" on your training record. These details apply until 31st May 2013. |
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For more regular updates on agronomic issues, find us on Twitter! Follow @DOWAGROUK If you require any further information please contact our technical Hotline on 0800 689 8899 or your local Dow AgroSciences representative. Use plant protection products safely. Always read the label and product information before use. ® Trademark of The Dow Chemical Company ("Dow") or an affiliated company of Dow. Boxer contains florasulam More information can be found at www.dowagro.com/uk |
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