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2. Preemergent herbicide - Wikipedia

   en.wikipedia.org/wiki/Preemergent_herbicide

   To prevent growth of crabgrass, preemergent herbicides must be applied at a critical time. If they are applied to the soil too early, they get washed too deep into the soil or washed away by rainwater. If they are applied too late, the key enzyme inhibited is no longer active. The best control requires a second application about 6–8 weeks later.

3. Dithiopyr - Wikipedia

   en.wikipedia.org/wiki/Dithiopyr

   Dithiopyr is a preemergent herbicide for crabgrass control in turf and ornamental grasses. It is effective on 45 grassy and broadleaf weeds. [1] Dithiopyr inhibits root growth of susceptible weeds as well as turf grass and thus should be used only on established turf with a well-developed root system.

4. How To Get Rid Of Crabgrass That's Growing In Your Lawn And ...

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   As for corn gluten, often sold as an organic pre-emergent product, it has 20- to 40-percent effectiveness. That means it’s not a reliable way to prevent crabgrass and other weeds from taking ...

5. How to Stop Crabgrass From Taking Over Your Lawn - AOL

   www.aol.com/lifestyle/stop-crabgrass-taking-over...

   After Crabgrass Grows. Pre-emergent herbicides won’t kill crabgrass that has already sprouted. If you didn’t get pre-emergent down at the optimal time, you can dig up baby crabgrass plants by ...

6. Campbell Vaughn: Now is the time to use preemergence ... - AOL

   www.aol.com/campbell-vaughn-now-time-p...

   Pre-emergence herbicides are applied to lawns prior to weed seed germination. Our standard recommendations are Sept. 1-15 for cool season weeds and mid-February to March 1 for warm season weeds.

7. Bensulide - Wikipedia

   en.wikipedia.org/wiki/Bensulide

   Proturk Goosegrass and Crabgrass Control and Anderson's Goose and Crabgrass Control both have bensulide as one of their active ingredients, along with oxadiazon at a concentration of 5.25% and 1.31% respectively. [3] Bensulide products may be used outdoors by homeowners on lawns and ornamentals, and by professional lawn care operators.