It is still worth keeping an eye out for problem grass weeds to limit any seed return and issues in following crops.
Black-grass and brome both shed significant numbers of seeds prior to harvest, so if they are found, viable seeds will probably already have been shed. This needs to be taken into account in planning the next crop.
Species such as black-grass and brome, if undetected, can rapidly spread in harvesting machinery etc. Preventing seed return and spread of problem weeds is key.
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