Kerb Weather Data – Report 2 – week ending 28 October 2016

Kerb® Weather Data gives timing advice for application of Kerb Flo 500 and ASTROKerb® to oilseed rape.

Soil temperatures (at 30 cms) in Yorkshire are now sufficiently low for applications to be considered. The decision to spray now or wait should be based on local conditions, including the realistic chances of being able to travel, consideration of potential risk to watercourses and priority of spraying grassweeds in cereals. Consult VI for advice on protecting water-courses. In Scotland, soil temperatures are still marginal for the most effective results on ryegrass and brome.

Over other oilseed rape growing areas it’s still too warm for outstanding results to be achieved with Kerb® Flo 500 for blackgrass control.

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 in the soil for grassweed uptake.

More Kerb Weather Data will be supplied as the season progresses.


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Will large crop canopies interfere with blackgrass control?
Trials with Kerb Flo 500 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.

What’s is the earliest crop stage I can spray?
Weather conditions aside, for both Kerb Flo 500 and ASTROKerb it is 3 true leaves of the oilseed rape.


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




First Report – week ending 14th October 2016

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