Preemergent herbicide

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1. A herbicide that is applied to turf to control germinating weed seeds; a herbicide that kills plants as they germinate. See also postemergent herbicide, herbicide, nonselective herbicide, and selective herbicide.

weed_prevention.jpg

The spraying of a preemergent herbicide to control weed development.
Source: http://www.ocagcomm.com

ConcernAllNaturalWeedPreven.jpg

Some preemergent herbicides are used to keep weeds from taking over a lawn.
Source: http://homeharvest.com