utilizing KBG dormancy to kill Poa Annua?

paulinctJuly 9, 2008

Hi Trey,

I have a kentucky bluegrass lawn in CT, zone 6b. I understand that dormancy is its defense against hot dry weather and that if it the crowns get a minimal amount of water then the plants won't die.

I also have Poa Annua, and recently came across a suggestion to let the grass go dormant during the summer to kelp kill off the Poa. That seems like a pretty elegant idea, if it will work.

I can imagine that it would provide a surer kill against the truly annual forms of Poa. But I wonder if it would have any effect on the more persistent forms - do they just go dormant too?

I haven't seen any studies on this, but then again I imagine most of the Poa research is focused on golf courses and other sites where dormancy is not an option. So I wonder if this is just an overlooked option for the homeowner who can live with summer dormancy for a little while.

Any thoughts appreciated.



P.S. I do plan on applying dimension next month.

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Dear Paul,

Thank you very much for your inquiry. Your knowledge on annual bluegrass (AB) is impressive. The ability to eradicate or control AB is very limited, and the money to investigate is quite large.

Those plants in your yard may die, but there is a large seed bank waiting to germinate during September, so a preemergent herbicide (like Dimension) is a must. Another product that has had some success is Ethofumesate (Prograss). This is a postemergent herbicide that is applied 3 times in the fall early winter.

AB loves water and fertilizer, the same as other grasses and the very aspects of management that bring us a nice green color. The biggest key may be sanitation, although in a home lawn, it may be impossible.

Again, thanks for the question and let me know if you have more.


    Bookmark   July 13, 2008 at 6:57AM
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Pre-emergent does not work. Applied 3 times summer,fall, and early winter. If you were to remove poanna with a sod cutter do you think this would work. My other possible solution is to kill off with round up and reseed. Any other suggestions

    Bookmark   May 18, 2010 at 9:46PM
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