This gives timing advice for application to oilseed rape.
Although some Kerb® Flo 500 and ASTROKerb® recommendations are being made, soil temperatures (at 30 cms) in the oilseed rape growing areas are around 11°C – 14°C, too warm for outstanding results for blackgrass control. In many places soils are also wet which will prohibit travelling anyway.
Please note a 30 cms soil temperature reading is less variable than the more commonly used 10 cm reading.
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. Both these criteria are rarely met before November.
More Kerb Weather Data will be supplied as the season progresses.
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Please ensure good practice when using Kerb Flo 500 or ASTROKerb to avoid restrictions on these products.
Should I apply ASTROKerb earlier?
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.