Kerb Weather Data – Final Report – week ending 24th 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 and applications are being made. Whilst soils are still dry in some places, any rainfall will help. Consider applications when conditions allow. Water stewardship needs to be top of mind. Applications must only be made after taking all necessary precautions to avoid contaminating water. Both Kerb Flo 500 and ASTROKerb® can be used until 31st January.

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



Do I need a dry-leaf for application?
The propyzamide active in Kerb Flo 500 is soil-acting so spraying wet weeds at run-off or light rainfall after application is not an issue. Ideally, the rainfastness of ASTROKerb is 1 hour for the aminopyralid element. Spraying on a drying leaf is OK but if rainfall falls within 1 hour and causes run-off efficacy may be reduced. All applications should be made with due regard to water stewardship, i.e. do not spray where there is a risk of run-off to adjacent watercourses.

Can I apply Kerb Flo 500 in a frost?
Kerb Flo 500 may be applied in frosty conditions but avoid application onto frozen ground where subsequent rainfall could result in run-off into watercourses.
For ASTROKerb please ensure frost is off the target broad-leaved weed.
If severe frosts are experienced before Kerb application, there may be some shear of surface roots of blackgrass. 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.

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