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

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   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.

3. Neil Sperry: It’s time for apply preemergent in Tarrant ...

   www.aol.com/neil-sperry-time-apply-preemergent...

   The most common preemergent herbicides are Dimension, Halts and Balan. You’ll find them sold in nurseries, hardware stores and home centers, and feed stores under several common brand names.

4. Preemergent herbicide - Wikipedia

   en.wikipedia.org/wiki/Preemergent_herbicide

   A pre-emergence spray of herbicide being added onto a field of oilseed rape. Preemergent herbicides are a form of chemical weed control which prevent germinated weed seedlings from becoming established. In some areas of the world, they are used to prevent crabgrass from appearing in lawns. [1]

5. 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.

6. How To Get Rid Of Crabgrass That's Growing In Your Lawn ... - AOL

   www.aol.com/rid-crabgrass-thats-growing-lawn...

   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 ...

7. Atrazine - Wikipedia

   en.wikipedia.org/wiki/Atrazine

   Atrazine is a chlorinated herbicide of the triazine class. [2] It is used to prevent pre-emergence broadleaf weeds in crops such as maize (corn), [3] soybean [3] and sugarcane and on turf, such as golf courses and residential lawns.