Postemergent herbicide

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1. A herbicide that is applied to control weeds after their germination and emergence from the soil; a herbicide that kills plants after they have grown to seedling stage or beyond. See also preemergent herbicide, herbicide, nonselective herbicide, and selective herbicide.

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RoundUp is one brand of postemergent herbicide.
Source: http://www.amleo.com/index/item.cgi?cmd=view&Words=rug2

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Timing of postemergent herbicide application for soybeans.
Source: http://www.omafra.gov.on.ca/english/crops/field/news/croptalk/2005/ct_0605a2.htm