Arthur Living
Member
- Location
- cambridgeshire
Have some big blackgrass in my OSR. Have the Kerb ready to go but is it too early with all this mild weather. Has anyone else had a go yet?
Kerb. Anyone started?
- Thread starter Arthur Living
- Start date
- Location
- Herts/Beds border
Sprayed mine last week. Lots of big broad leaf weeds. No pre em. Everyone telling me it's too warm, I thought it was too warm, but agronomist said I should do it and I've got to trust him, its what i pay him for.
If you go now, at least your black grass will still be growing...
If you go now, at least your black grass will still be growing...
- Location
- Shropshire
I did mine two weeks ago, but also did it for broad leaf weeds. Glad I did do it as it is like a quagmire here now.
It's still too warm.
Dow do a reasonable postcode checker service for soil temperatures but there's no substitute for your own soil thermometer, particularly when you think about how much you spend on Kerb & Crawler each year
http://uk.dowagro.com/2015/11/
Dow do a reasonable postcode checker service for soil temperatures but there's no substitute for your own soil thermometer, particularly when you think about how much you spend on Kerb & Crawler each year
http://uk.dowagro.com/2015/11/
- Location
- Bedfordshire
"Propyzamide in Kerb flow 500 is soil-acting, so spraying wet weeds at run off or after light rainfall is not an issue. In colder conditions its activity is prolonged and because frosts cause black-grass to throw out more adventitious roots, there is improved uptake of propyzamide. Kerb Flo 500 can be applied in frosty weather. However do not spray onto frozen ground if rain is forecast as this could result in run-off into water courses. Precautions are vital in order to avoid contaminating water. AstroKerb, on the other hand, contains the residual propyzamide plus the contact-acting aminopyralid and so the broad-leaved weeds targeted, poppies and mayweeds, are best controlled when applications are made to a dry leaf. If it rains within one hour after application, efficacy will be reduced. For AstroKerb, wait until the frost is off the weed leaf and the leaf is dry enough.”
- Location
- Bedfordshire
Month: November 2015
Kerb Weather Data – Report 4 – week ending 6th November 2015
With the unseasonably mild weather, soil temperatures (at 30 cms) over the major rape growing areas of the UK have been largely static over the last two weeks and are still too warm at around 10.5°C-13°C for consistent results to be achieved for blackgrass control.
When applied to “warm” soils it is not only persistence that can be compromised as the propyzamide breaks down relatively quickly, but also the lethal concentration of propyzamide itself in the rooting zone of the blackgrass.
In Yorkshire, soil temperatures are around 8°C-9°C, (nearer to the point where the half-life is relatively longer) and application can be considered.
For optimal blackgrass control in oilseed rape, Dow AgroSciences recommend Kerb® Flo 500 and ASTROKerb® applications are made when soil temperatures have got down to 10°C and falling, and there is sufficient soil moisture in the soil for grassweed uptake. Both these criteria are rarely met before November. This advice has been proven in extensive trials over many variable autumns. Similar advice would apply to ASTROKerb. Please note this advice applies to oilseed rape; for winter beans Kerb Flo 500 should be applied within 7 days of drilling but before crop emerges. ASTROKerb is not approved for winter beans.
Data for soil temperatures and moisture-deficits are below. Please note a 30 cms soil temperature reading is less variable than the more commonly used 10 cm reading.
More Kerb Weather Data will be supplied as the season progresses.
Click on the My Farm LifeCycle logo to check out forecast conditions for optimizing Kerb Flo 500 and ASTROKerb applications on farm. Simply enter your postcode in the banner and click GO to view the results.
FAQs
If I wait, won’t the blackgrass roots be too big/too deep for outstanding control?
Propyzamide, the active ingredient for blackgrass in Kerb Flo 500 and ASTROKerb, works mainly by root uptake in the top 5 cms of soil. As long as the oilseed rape has been established using min-till techniques, the majority of the blackgrass will be shallow rooted and even when it develops a more extensive root system, is still likely to have sufficient roots in the Kerb activity zone for uptake.
If severe frosts are experienced before Kerb application, there may be some shear of surface roots. In this situation adventitious roots may subsequently develop, which will take up propyzamide from a later application. In this scenario we have seen excellent results from December/January application.
Kerb Weather Data – Report 4 – week ending 6th November 2015
- 05/11/2015
With the unseasonably mild weather, soil temperatures (at 30 cms) over the major rape growing areas of the UK have been largely static over the last two weeks and are still too warm at around 10.5°C-13°C for consistent results to be achieved for blackgrass control.
When applied to “warm” soils it is not only persistence that can be compromised as the propyzamide breaks down relatively quickly, but also the lethal concentration of propyzamide itself in the rooting zone of the blackgrass.
In Yorkshire, soil temperatures are around 8°C-9°C, (nearer to the point where the half-life is relatively longer) and application can be considered.
For optimal blackgrass control in oilseed rape, Dow AgroSciences recommend Kerb® Flo 500 and ASTROKerb® applications are made when soil temperatures have got down to 10°C and falling, and there is sufficient soil moisture in the soil for grassweed uptake. Both these criteria are rarely met before November. This advice has been proven in extensive trials over many variable autumns. Similar advice would apply to ASTROKerb. Please note this advice applies to oilseed rape; for winter beans Kerb Flo 500 should be applied within 7 days of drilling but before crop emerges. ASTROKerb is not approved for winter beans.
Data for soil temperatures and moisture-deficits are below. Please note a 30 cms soil temperature reading is less variable than the more commonly used 10 cm reading.
More Kerb Weather Data will be supplied as the season progresses.
Click on the My Farm LifeCycle logo to check out forecast conditions for optimizing Kerb Flo 500 and ASTROKerb applications on farm. Simply enter your postcode in the banner and click GO to view the results.
FAQs
If I wait, won’t the blackgrass roots be too big/too deep for outstanding control?
Propyzamide, the active ingredient for blackgrass in Kerb Flo 500 and ASTROKerb, works mainly by root uptake in the top 5 cms of soil. As long as the oilseed rape has been established using min-till techniques, the majority of the blackgrass will be shallow rooted and even when it develops a more extensive root system, is still likely to have sufficient roots in the Kerb activity zone for uptake.
If severe frosts are experienced before Kerb application, there may be some shear of surface roots. In this situation adventitious roots may subsequently develop, which will take up propyzamide from a later application. In this scenario we have seen excellent results from December/January application.
- Location
- Bedfordshire
That is my plan as well, then follow with Kerb (if needed) in Dec/Jan.
That is certainly the dilemma - wait & you can't travel on massive BG plants or do it now on smaller ones & have the chemical run out of activity in less than a month. Crawler now followed up by Kerb later is very pricey but at least it would do an excellent job. It's the only real in crop chemical group for BG control in osr other than glyphosate.
Arthur Living
Member
- Location
- cambridgeshire
Centurion max was patch sprayed on worst patches 3 weeks ago and it seems to have had some effect. Just wondering about kicking the blackgrass whilst its down
Flintstone
Member
- Location
- Berkshire
I just can't understand people going completely against the manufacturer's guidance on a product, when one of the critical aspects of Kerb's efficacy is to use it when temperatures have dropped right off. It is an unbelievably mild Autumn, so if there was ever a year that early application is a waste of money and time, it's surely this one?
Wasn't this exact same discussion taking place here about this time last year?!!
Wasn't this exact same discussion taking place here about this time last year?!!
Fish
Member
- Location
- North yorkshire
Looking at Dow's web site, looks like North Yorkshire is good to go.
some agronomists are there own worst enemy too, got a call to do some spraying for a customer 1st of oct, this year said couldnt go for few days because i was drilling. it was about 14th of oct when i actually got there due to drilling and lack of spaying weather. Went to chemical store to find sheet of what needed spraying to find, it was kerb on the OSR
richardnyo
Member
- Location
- Cardiff CF3
Definitely too warm for Kerb/Astrokerb at the moment at least in the South and West we had temperatures of 16oC today but more rain so no spraying conditions anyway. A lot of people have been asking about putting AminoA+ in their TM with Kerb and fungicide. We have done some compatability tests with the following mixtures in 200 l ha Kerb /Astrokerb 1.7 l ha, AminoA+ 1.5 kg ha and the following fungicides Proline 0.63 l ha / Refinzar 1l ha /Prosaro 1 l ha /Folicur 1 l ha. We have also added 75 ml Hallmark Zeon to the mix. We have not had compatability issues with those mixes and have not had any observable negative effects on the crop. However all mixtures are done at growers own risk. The only problem with the mixure is actually the Kerb/Astrokerb itself as it comes readily out of suspension anyway without any other products added so it is important to keep agitation going and to agitate well any tankfulls that have been left standing. In fact we observed that Folicur appeared to hold it in suspension better than the other mixtures and that Refinzar appears to foam more but this was at the full rate of 1 l ha. The real problem is that in these warm conditions the crop is developing rapidly and we need to get the AminoA+ on before the start of flower initiation which could be early in December. Therefore if conditions remain mild it may be necessary to go on with a fungicide first and then with Kerb later. In this case we would recommend that you add AminoA+ with the fungicide but if it cools down some then you can go with the full tank mix.
What is AminoA please?
Welcome to the forum
Edit: I have just looked it up. http://aminoa.co.uk/aminoa-plus/
Welcome to the forum
Edit: I have just looked it up. http://aminoa.co.uk/aminoa-plus/
richardnyo
Member
- Location
- Cardiff CF3
Thanks. You will find plenty of info on the website. The autumn recommendations are in the News section. There has been lots of work done with AminoA+ in high value hort crops but it has only been commercially available in the UK since July. So we are still working out the best way to use it in broadacre crops.
It should be applied when the leaf is reasonably dry or the frost is off. However it is also suitable for use in fertigation systems so if you do have heavy rain after an application it will be taken up through the root.
It should be applied when the leaf is reasonably dry or the frost is off. However it is also suitable for use in fertigation systems so if you do have heavy rain after an application it will be taken up through the root.
No no and no, far to early, we have had to change plans an put crawler on now would of been good just to hit it with kerb but grass weeds are just not going to wait for that and we want the best kill in the rape!