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In the October edition
- Tank mixing Kerb/Astrokerb® with Belkar®
- Propyzamide: Key information and stewardship
- Kerb® Flo 500 weed control in winter beans
- Autumn application of BlueN™ in WOSR
- Use tried and tested grassweed control programmes this autumn
- Volunteer oat control with Broadway® Star in winter wheat
- The importance and benefits of using a silage additive
- Have you downloaded the Corteva arable app yet?
- Don't miss out on our £200 OSR Offer - registrations closing soon
- We're exhibiting at British Potato 2023
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Tank mixing Kerb/Astrokerb® with Belkar®
As autumn herbicide applications get into full swing, we have received several enquiries about tank mixing Belkar® and Astrokerb®. This is a good choice where you have a range of broad leaved weeds as well as grass weeds to control.
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 tank-mixing Belkar with Astrokerb gives an effective solution to get good control of cleavers, fumitory, shepherd’s purse, and all cranesbill species.
For more information on different programme scenarios, you can take a look at our latest topic sheet here.
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Use rates
The key to good grass weed control with propyzamide is to apply to weed seeds germinating in the top 5cm or so 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 or Astrokerb plus Belkar (0.5L/ha) is a popular tank mix strategy, controlling a broad spectrum of weeds in one application.
- Belkar has a wide range of compatibility options, including fungicides and insecticides. However, please note that Belkar cannot be mixed with fungicides that have known PGRs effects, ie metconazole, tebuconazole. View tank mix information for Belkar here.
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Propyzamide: Key information and stewardship
We have just launched our Propyzamide Back to Basics online Hub. Here you will find everything you need to know about this selective, systemic herbicide for use in oilseed rape, so take a look. You'll be one of the first to see our new video featuring Corteva's Sally Egerton and Clare Stapley.
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It's October, so take the time now to remind yourself about the key stewardship advice from Corteva and The Voluntary Initiative ahead of autumn and winter propyzamide applications!
Our propyzamide stewardship webpage has been updated with simplified information to ensure that you are using Astrokerb® and Kerb® Flo 500 at the right rate, in the right conditions, and at the right time. These products are key to controlling grassweeds, especially blackgrass and ryegrass in oilseed rape.
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Kerb® Flo 500 weed control in winter beans
Dry harvested winter and spring field beans are now considered a major crop and therefore many off-label (EAMU) authorisations have expired, so leaving fewer pre-emergence herbicide options. Reducing weed competition is important for early crop establishment.
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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Autumn application of BlueN™ in WOSR
BlueN, Corteva’s Nutrient Efficiency Biostimulant, provides WOSR crops with a sustainable way to capture nitrogen throughout the season. The nitrogen captured from the atmosphere by BlueN is not affected by unfavourable weather conditions which can cause leaching or volatilisation during the growing season. BlueN can be applied to WOSR in the autumn or in the spring.
Where WOSR autumn canopy development is good, i.e, from 4-6 leaves and leaf loss due to frosts and pigeon damage is not expected during the winter months, apply BlueN when temperatures are above 10°C to help colonisation of bacteria in the plants.
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Average yield increase 133 kg/ha. In the range of 80-180 kg/ha, yield increase observed in all 3 trials.
If severe frosts or pigeon damage defoliate the crop during the winter, BlueN can be reapplied in the spring.
Meta-analysis data has shown that in 63% of trials, applying BlueN to crops "on top" of the planned fertiliser programme brings a yield increase over those that were not treated with BlueN. The average yield increase benefit was found to be +0.2 t/ha.
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Want to know more about BlueN? Watch our “Introduction to BlueN” video featuring Iuliia Kovalova, Corteva’s Field Technical Manager for Biologicals.
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Use tried and tested grassweed control programmes this autumn
As drilling and pre-emergence applications come to a close, growers' minds should now turn to planning the post-emergence follow-up spray where needed.
Hitting grass weeds early, before they become competitive is more important than ever, particularly when it comes to difficult grass-weeds such as brome and ryegrass. 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
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 of larger oats will reduce 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).
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These oat varieties are trademarks of other manufacturers for which proprietary rights may exist. All manufacturers tradenames and trademarks are duly acknowledged.
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The importance and benefits of using a silage additive
The autumn maize harvest is now well under way, it is important to consider the potential benefits of harvesting some of the crop for crimped grain maize silage. Considering the nutritional value of the crimped maize silage, adding a silage inoculant to enhance the fermentation process and ensure aerobic stability is an important step in the ensiling process. Pioneer brand 11A44 will dramatically reduce heating within the silage pit. Shown to decrease yeasts and moulds to just 0.1% of untreated control silage, this product will improve fermentation and reduce dry matter losses when used on crimped maize at less than 65% dry matter.
In circumstances where a quick feed out is needed, our crimped grain maize inoculant 11B91 Rapid React® containing Lactobacillus plantarum and Lactobacillus buchneri will give the rapid drop in pH and the aerobic stability to allow feed out as soon as 7 days. The Lactobacillus plantarum in 11B91 Rapid React will also ensure a faster and more efficient acid fermentation than that achieved when using 11A44.
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Have you downloaded the Corteva arable app yet?
The Corteva arable app provides farmers and advisors with information on Corteva's arable crop protection products, including tank mixes and labels. You will also find key information about our oilseed rape and maize hybrids.
The app incorporates Corteva's Kerb Weather Data decision support service, which presents application information by post code to indicate when conditions are optimum for Astrokerb and Kerb Flo 500 applications.
Individual fields can be pin-pointed to see if conditions are suitable for herbicide applications, building additional accuracy on top of the post code search function. The slope of the field – a factor of significant importance when mitigating run off – can also be determined. An indication of soil type is also built in.
Download the app by 15th December on your Apple or Android device and be in with a chance to win a Belkar® messenger bag.
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Don't miss out on our £200 OSR Offer - registrations closing soon
We are once again running our OSR Offer to help you maximise the potential of your oilseed rape crop. This year, we will be offering £200 cashback to anyone that purchases Protector® Sclerotinia tolerant hybrid, PT303 and Belkar® herbicide for the 2023/24 growing season. Anyone taking part in the offer will be eligible for a one-off payment of £200 if they make a purchase before 1 November 2023 and submit a claim form by 15 November 2023*. Click here to find out more and register your interest.
*Terms and conditions apply.
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We're exhibiting at British Potato 2023
We will be attending British Potato 2023 on 22nd and 23rd November held in the Harrogate Yorkshire Event Centre. The biennial event offers the opportunity for all those in the potato industry to come together to network and see what's new. Register your attendance and come along to stand 153 on the day to chat with our experts about our range of products and solutions for your potato crop.
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Want to hear more from us?
Update your preferences and tailor your choices to make sure you receive the communications that are right for you. Don't forget to enter into our monthly prize draw by ticking the box before submitting to be in with the chance to win.
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Subscribing to Corteva Agriscience Arable Update gives eligibility for 2 BASIS points and/or 2 NRoSO points. Sign up to this e-newsletter to receive the points.
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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. Astrokerb® contains aminopyralid and propyzamide. Belkar® contains halauxifen-methyl (Arylex™ active) and picloram. Kerb®Flo 500 contains propyzamide. Korvetto® contains clopyralid and halauxifen-methyl (Arylex™ active). BlueN™ contains Methylobacterium symbioticum. Broadway® Star contains pyroxsulam and florasulam.
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