Post-emergent herbicides are only marginally effective. Triclopyr + clopyralid or triclopyr alone are suggested.
Photographs courtesy of Judy Sedbrook.
The most common treatment for crabgrass involves the use of both pre- and post-emergent herbicides.
So many homeowners pump gallons of post-emergent herbicides on their lawns that they deplete their soil of vital nutrients, as well as potentially poison the local water sources.
Post-emergent herbicides target specific breeds (in this case, broadleaved weeds) and can be sprayed directly on lawns. Look for low-profile, dark green leaves with serrated edges.
They say if you snooze, you lose! Crabgrass germinates in the spring, and once that happens, you'll need to switch control tactics. Use a post-emergent herbicide that's labeled for crabgrass control. (And always follow the label directions to a tee!) ...
It's particularly important that you read and follow label instructions carefully as not all herbicides for weed control are the same. For example, pre-emergent types control weeds by preventing seed germination. Post-emergent herbicides are only ...
 See also: Herbicide, Post-Emerge, Herbicides, Pre-Emerge, Plant
  
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