Should fertiliser be required, it must be placed deep enough in the seedbed to allow its utilisation by the crop. Surface applications are ineffective. For winter beans the seed and P and K should be applied together.
Pre-emergence residual herbicides, which require soil moisture for activity, should form the backbone of weed control programmes in winter beans, as the post-emergence options are limited to just one product.
The pre-emergence choices include:
•Carbetamide – grass weeds, volunteer cereals and a few broad-leaved weeds
•Pendimethalin – tank mix with carbetamide to extend the weed spectrum
•Propyzamide – annual grasses, broad-leaved weeds (including some activity on germinating cleavers)
•Clomazone – cleavers, chickweed, shepherd’s purse, fools parsley and red dead-nettle
•Pendimethalin + imazamox – wide spectrum of broad-leaved weeds plus early emerging volunteer oilseed rape
•Clomazone + linuron – broad spectrum with useful cleaver activity
In addition, there is an EAMU for prosulfocarb.
For information: options which include linuron will no longer be available after autumn 2017 – use update June 2018
There is only one approved post-emergence treatment for beans, which can be useful as a follow up treatment:
Bentazone – use on small weeds in warm weather for cleavers and volunteer oilseed rape
At the moment bentazone authorisation expires on 30 June 2017. If there is no renewal there will be a knock on effect on products. In the main, products expire end 2019.
There are several selective post-emergence grass weed herbicides which can be used in winter beans. No products control annual meadow grass, others are only effective on the weed if application timing is accurate.
Graminicide choice includes:
•Fluazifop-p-butyl – wild oats, volunteer cereals, barren brome
•Quizalofop-p-ethyl – wild oats and other grasses
•Cycloxydim – wild oats, barren brome and other grasses
•Propaquizafop – wild oats, barren brome
Where resistant black-grass is a concern, a different approach is required. This can be based on carbetamide and propyzamide, which have no known resistance issues.
AT ALL TIMES FOLLOW THE MANUFACTURER’S RECOMMENDATIONS