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Herbicide Resistance in Weeds: What is the Nature of the Problem?--Micheal D. K. Owen
Pages 3-6

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From page 3...
... Currently there are 388 herbicide-resistant weed biotypes represented by 208 weed species.1 These evolved resistances include resistance to all of the commercially available herbicide mechanisms of action. One or more of these resistances may be represented in a given species.
From page 4...
... There are specific populations of common waterhemp that have evolved multiple resistances to as many as five different herbicide mechanisms of action. Given that, to date, most of the evolved herbicide resistances are dominant traits; these evolved traits will spread quickly.
From page 5...
... of action. The Therate ofof rate resistance evolution resistance has evolution accelerated; has more accelerated; farmers more relyrely farmers on single on single herbicides herbicidesto tocontrol controlweeds.

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