Quality losses in products
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This is likely to be true with crops grown for seed, when contamination by weeds greatly increases the costs of the cleaning process. In some cases contaminated seed will not be acceptable in crop seed at all, eg. the poisonous blackberry nightshade (Solanum nigrum) in crops of peas grown for the canning or freezing industries. Other losses could result from the weed producing off-flavours in the harvested product or the weed may reduce the quality of the oil (eg. linseed) or protein (eg. barley) in the harvested product.

Steve Adkins