Postemergent herbicide
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1. A herbicide that is applied to control weeds after their germination and emergence from the soil. See also preemergent herbicide, herbicide, nonselective herbicide, and selective herbicide.
Trimec Plus is a type of postemergent herbicide that is spread over weeds that are already visible.
Source: http://alltheweb.com/search?cat=img&cs=iso88591&q=post-emergent+herbicide&rys=0&itag=crv