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