What to consider before you spray KERB / ASTROKerb this season

OSR in autumn

Growers should be getting ready to apply ASTROKerb (propyzamide and aminopyralid) and Kerb Flo 500 (propyzamide) to winter oilseed rape. Rape crops have been developing rapidly and most are well past the 3 leaf stage. Most advanced crops have 10 leaves. Even when canopies are dense, excellent black-grass control can be achieved with these herbicides.

Kerb Weather Data – Report 5 – week ending 17th November 2017

This gives timing advice for application to oilseed rape. (For beans, Kerb® Flo 500 must be applied within 7 days of drilling but before crop emergence).

Soil temperatures have cooled (at 30 cms) in the main oilseed rape growing areas and applications are being made. Still dry for best efficacy on blackgrass in places, particularly in Eastern England, and parts of Nottinghamshire and Lincolnshire, but moisture in the top 5 cms, where the propyzamide is active, will help alleviate this.

There is considerable risk to water if there is heavy rainfall within 48 hours after application to a dry soil, so caution is recommended. Too dry and propyzamide will not bind to the soil leaving it susceptible to leaching away in a high rainfall scenario and washing too deep into the soil past the rooting zone of the blackgrass.

Check out application conditions for your local postcode

 

Click on the link to the left to use the postcode checker. 

Simply enter your postcode in the banner and click GO to view the results.

 

 

 

 

Please ensure good practice when using Kerb Flo 500 or ASTROKerb to avoid restrictions on these products. 

 

 

FAQs

Will large crop canopies interfere with blackgrass control?
Trials have shown that even where canopies are dense, excellent blackgrass control can be achieved once optimum soil conditions are met.
As ASTROKerb will mainly be used for blackgrass, this should drive application timing. ASTROKerb has both contact and root activity on poppies and mayweeds and in our extensive trials programme, when optimally timed for blackgrass control even where canopies were large, control of these broad-leaved weeds has been good.

Download  Topic Sheet 16 “Advice for Blackgrass Control in Oilseed Rape” for further advice

Kerb Weather Data – Report 4 – week ending 10th November 2017

This gives timing advice for application to oilseed rape. (For beans, Kerb® Flo 500 must be applied within 7 days of drilling but before crop emergence).

Soil temperatures are cooling (at 30 cms), in the main oilseed rape growing areas and applications are being considered. In East Anglia, soils are still somewhat dry but rain is in the forecast for the weekend.

There is considerable risk to water if there is heavy rainfall within 48 hours after application to a dry soil, so caution is recommended. Too dry and propyzamide will not bind to the soil leaving it susceptible to leaching away in a high rainfall scenario and washing too deep into the soil past the rooting zone of the blackgrass.

For optimal blackgrass control 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 for grassweed uptake.

Check out application conditions for your local postcode

 

Click on the link to the left to use the postcode checker. 

Simply enter your postcode in the banner and click GO to view the results.

 

 

 

 

Please ensure good practice when using Kerb Flo 500 or ASTROKerb to avoid restrictions on these products. 

 

 

FAQs

Will large crop canopies interfere with blackgrass control?
Trials have shown that even where canopies are dense, excellent blackgrass control can be achieved once optimum soil conditions are met.
As ASTROKerb will mainly be used for blackgrass, this should drive application timing. ASTROKerb has both contact and root activity on poppies and mayweeds and in our extensive trials programme, when optimally timed for blackgrass control even where canopies were large, control of these broad-leaved weeds has been good. Where broad-leaved weeds are the sole driver an earlier application could be considered before broad-leaved weeds become too large.

Download  Topic Sheet 16 “Advice for Blackgrass Control in Oilseed Rape” for further advice

Kerb Weather Data – Report 3 – Week ending 3rd November 2017

This gives timing advice for application to oilseed rape. (For beans, Kerb® Flo 500 must be applied within 7 days of drilling but before crop emergence).

Soil temperatures are cooling (at 30 cms) and are now around 10°C – 13°C, in the main oilseed rape growing areas. In Scotland and the North, applications are now being considered but in many areas soils are also very wet making application difficult. Further South, soils are still warm and are also dry – in the East particularly so. There is considerable risk to water if there is heavy rainfall within 48 hours after application to a dry soil, so caution is recommended. Too dry and propyzamide will not bind to the soil leaving it susceptible to leaching away in a high rainfall scenario and washing too deep into the soil past the rooting zone of the blackgrass.

Control of broad-leaved weeds in winter cereals this autumn

Broad-leaved weeds coming through

In simple terms there are two broad-leaved weed scenarios that require attention in fields this autumn:

The ‘Compromised Residual’ – this can occur because of poor seed beds, dry conditions and residual applications made after the broad-leaved weeds have emerged.

The ‘Not Yet Sprayed’ – this is most likely in fields where grassweed pressure is lighter (so less requirement for residual ‘stacking’) and also where farm workload has meant that fields have yet to be sprayed with any herbicide.