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Weed infestations will often lead to increased tillage operations,
greater herbicide usage and may damage farm machinery (plants with long
wiry stems which spread close to the ground). As some weeds may cover
others the efficacy of herbicides may be reduced and more herbicide
will have to be used to achieve good control. Finally some weed products
(e.g. seeds) may infest crop products and increase transport costs of the
crop.
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Weeds growing in fallow need to be
removed before crops are grown.
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