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In the October edition
- Tank mixing Kerb/Astrokerb with Belkar
- Volunteer linseed in oilseed rape
- Kerb Flo 500 weed control in winter beans
- Kerb Weather Data upgraded and new tank mix tool on the Corteva arable app
- Use tried and tested grassweed control programmes this autumn
- Volunteer oat control with Broadway Star in winter wheat
- In the news: Corteva has acquired biological leader Symborg
- CPD courses available
- Monthly prize draw for signing up to a Corteva email
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Tank mixing Kerb/Astrokerb with Belkar
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As autumn herbicide applications get into full swing, we have received several enquiries about tank mixing Belkar® and Astrokerb®. While this is not an obvious strategy, there is logic too, so here is some guidance.
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The driving weed will be a grassweed and most probably blackgrass or ryegrass. These will be controlled by the propyzamide in Astrokerb, especially if applied at 1.7L/ha. Astrokerb will also control mayweeds, poppies and thistles. It will not control cleavers, shepherd’s purse or fumitory and will only deliver moderate control of cranesbill.
So you can tank mix Astrokerb with Belkar to get good control of cleavers, fumitory, shepherd’s purse, and all cranesbill species.
Use rates
The key to good grass weed control with propyzamide is to apply to weed seeds germinating in the top 5cm of soil, when soil temperatures are 10°C and falling, and when there is sufficient soil moisture present (but not waterlogged).
Conditions aren’t suitable yet but tend to be from November onwards and it’s likely that at this time broad-leaved weeds will be quite large and require 0.5L/ha of Belkar. For grassweed control and wide-spectrum broad-leaved weed control, Kerb®Flo 500 plus Belkar (0.5L/ha) is a popular tank mix strategy, controlling a broad spectrum of weeds in one application.
- View tank mix information below for Belkar here.
- Also take a look at the new tank mix tool on the Corteva Arable app for quick reference to OSR herbicide tank mix information.
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Volunteer linseed in oilseed rape
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Calls to our hotline have highlighted that volunteer linseed can become a problem in oilseed rape. There is some limited data to suggest that Arylex™ active demonstrates good activity against linseed up to 6-8 leaves. This can be delivered in 0.5L/ha of Belkar this autumn.
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Kerb Flo 500 weed control in winter beans
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Kerb Flo 500 has an approval for grassweed and some broadleaved weed control in winter beans. It should be applied pre-emergence within seven days of drilling. Ideally soil temperatures should be falling, preferably 10°C and declining with sufficient soil moisture. As with applications of Kerb Flo 500 to oilseed rape, please be aware of the risk to water and mitigate the risk (grass buffer strips, avoiding steep slopes etc.)
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Have you downloaded our Arable app? Upgraded functionality for Kerb Weather Data and new tank mix tool
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Significant upgrades to the Kerb Weather Data tool on Corteva’s Arable app were launched last October, helping growers and advisors to be even more precise when timing oilseed rape herbicide applications this season.
The weather data’s simple traffic light system has guided application advice for years, but the upgrade introduces new functionality, helping the industry achieve an even higher level of product stewardship by helping identify and thus reducing the risk of active ingredients running off the field.
The Corteva Arable app now also features a new tank mix search tool for oilseed rape herbicides.
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Access Kerb Weather Data on the free Corteva Arable app available for iOS and Android devices (Search “Corteva Arable”).
You can also sign-up to the Kerb Weather Data e-newsletter here. Our first newsletter is being issued next week.
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Download the Corteva arable app between 15 September – 15 November 2022 and we will enter you into our prize draw to win a Belkar messenger bag!
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Use tried and tested grassweed control programmes this autumn
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Dry weather conditions have allowed wheat drilling to continue at pace so applications of some pre-emergence herbicides may have been delayed or missed. The reduced glyphosate availability and protracted grass weed emergence, will also mean that the grassweed burden could continue to appear later in the season than usual in some crops.
This makes hitting weeds early – before they become competitive – more important than ever. Using a residual in combination with a post-emergence herbicide is also an important part of good resistance management strategy. The residual component will take out or heavily restrict the growth of some early-emerging grassweeds, leaving less work for the contact spray to do later, meaning better overall control and a reduced risk of resistance building.
Broadway® Star has been a mainstay of autumn and spring grassweed programmes for many years, delivering excellent control of sterile and great brome when used following an application of pendimethalin plus flufenacet in the autumn. For best results, always apply Broadway Star when target weeds are small and actively growing.
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Volunteer oat control with Broadway Star in winter wheat
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With over 100,000 hectares of oats planted annually, it is likely that you will get a volunteer problem in subsequent cereal crops. Volunteer oats are extremely competitive in a winter wheat crop and should be controlled early, in order to avoid competition that may result in loss of yield. Because you are trying to control a cereal in a cereal crop, the options for control are limited.
If an oat crop was grown last season, check the fields in autumn for oat volunteers as soon as the crop emerges. If they are present, they are most easily controlled in autumn when small, rather than leaving them until spring, where control can be variable.
Using Broadway Star
Broadway Star will control volunteer (tame oats) when used at 265g/ha + Adjuvant. Optimum control is achieved in the autumn when the oats are small. As a general rule of thumb, control will reduce the larger oats the later you try to treat them. So for Broadway Star, control will decline beyond growth stage 30 (stem extension). However, Broadway Star offers much more consistent control than ACCase chemistry for example.
Data from a Corteva Agriscience trial carried out in 2021/2022 showed that Broadway Star + Adjuvant fully controlled the following tame oat varieties when applied in the autumn; Fusion, Elyann, Isabel, Balado, Mascani, Lineout, Southwark, Canyon and Dalguise. In the same trial, spring applications resulted in inferior control, due mainly to the larger size of the oats and less than ideal conditions at the time of application (dry and cold). Spring applications of Broadway Star still gave acceptable control of Fusion, Elyann and Isabel.
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Corteva has acquired biological leader Symborg
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Corteva has acquired biological leader Symborg, an expert in microbiological technologies based in Murcia, Spain. Corteva continues to build our portfolio, providing cost effective solutions for farmers. Read the full press release here.
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Earn CPD points with courses from Corteva
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We have several online training courses to support both farmers and agronomists with their continued professional development. Take a look at how you can earn CPD points with Corteva Agriscience.
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Have you signed up to one of our e-newsletters? Don't forget to check the box to enter our monthly prize draw.
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Photo: India Dodge-Forder and Charlie Cooper are working at Corteva as part of the MDS placement scheme. Pictured here with the prize for October entrants (a winner will be selected early November)
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If you have feedback on this email, or would like to see new topics included in the future, please send us an enquiry or get in touch using the details below.
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USE PLANT PROTECTION PRODUCTS SAFELY. Always read the label and product information before use. For further information including warning phrases and symbols refer to label. Corteva Agriscience UK Limited, CPC2 Capital Park, Fulbourn, Cambridge CB21 5XE. Tel: 01462 457272. ®, ™ Trademarks of Corteva Agriscience and its affiliated companies. All other brand names are trademarks of other manufacturers for which proprietary rights may exist. All manufacturers tradenames and trademarks are duly acknowledged. © 2022 Corteva. Astrokerb® contains aminopyralid and propyzamide. Belkar® contains halauxifen-methyl (Arylex™ active) and picloram. Broadway Star® contains pyroxsulam and florasulam. Kerb®Flo 500 contains propyzamide Korvetto® contains clopyralid and halauxifen-methyl (Arylex™ active).
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