Kerb Weather Data – Final Report – Week ending 18th November 2016

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

With cooler conditions and moist soils consider application to oilseed rape when conditions allow. Consider potential risk to watercourses. Consult VI for advice.

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.

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Will the activity of ASTROKerb be affected by low temperatures occur after application?
No, although broad-leaved weeds will only start to show symptoms and die when active growth re-commences.

 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.



First Report – week ending 14th October 2016
Second Report – week ending 28th October 2016
Third Report – week ending 4th November 2016
Fourth Report – week ending 11th November 2016
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