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Poa annua #752088

Asked May 25, 2021, 4:01 PM EDT

I have a problem with poa annua and have been trying to get rid of it for years. Can you tell me what pre emergent I should use in the fall. How many applications in the fall and exactly when to put it down. I aerate in spring so what should I use on the spring also. Thank you very much.

Grand Traverse County Michigan

Expert Response

Would it be possible for you to attach a few photos? That helps our experts respond with a more accurate response

Ask Extension Question Wrangler Pronouns: she/her/hers Find your local Extension office here: https://www.canr.msu.edu/outreach/county Find an expert in a specific topic here: https://www.canr.msu.edu/outreach/experts/experts-by-topic-area Find home gardening information here: https://www.canr.msu.edu/home_gardening/ Order a soil test kit here: https://www.canr.msu.edu/news/soil-testing-returns-through-msu-extension Mold questions? We don’t have an expert in mold, but we do have a few resources below or contact the  Michigan health department. Molds in the Home Indoor Air Quality May be Hazardous to Your Health   Mushroom questions? We can’t identify, but we do have these three resources to help you: Identifying  Morel  Poisonous MSU is an affirmative-action, equal-opportunity employer. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. Michigan State University occupies the ancestral, traditional and contemporary lands of the Anishinaabeg, Three Fires Confederacy of Ojibwe, Odawa and Potawatomi peoples. The University resides on the land ceded in the 1819 Treaty of Saginaw. Replied May 25, 2021, 4:02 PM EDT
Yes I can attach photos but I know it is poa annua [annual blue grass]

On Tue, May 25, 2021 at 4:02 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied May 25, 2021, 4:21 PM EDT
Here is the picture. Thanks 
image

On Tue, May 25, 2021 at 4:17 PM Brian McFadden <<personal data hidden>> wrote:
Yes I can attach photos but I know it is poa annua [annual blue grass]

On Tue, May 25, 2021 at 4:02 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied May 25, 2021, 4:27 PM EDT

Identifying annual vs. Kentucky bluegrass comes down to a few things.  Both types produce seed in the spring.  Annual is lighter green, grows more in a clump and the easiest characteristic is the ligule.  Annual bluegrass has a large ligule and that is the easiest way to make sure.  See Purdue site: https://turf.purdue.edu/which-is-it-annual-bluegrass-or-kentucky-bluegrass/  Getting rid of it over a large area is even hard for professionals including golf courses.  The problem is that annual bluegrass can be a weak perennial and often continues to survive year to year.  Purdue publication states that it begins to germinate in late summer to early fall when soil temperature drop below 70.  Early September would be the time to apply pre-emergent herbicide.  This will not get rid of the perennial form that survives year to year.  For more in-depth information on control see the following publication: https://www.extension.purdue.edu/extmedia/ay/ay-41-w.pdf

This publication also lists in a table, cultural practices that can help discourage the establishment of Poa annua

An Ask Extension Expert Replied June 03, 2021, 1:48 PM EDT

Thank you !! 


On Thu, Jun 3, 2021 at 1:48 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied June 03, 2021, 2:09 PM EDT

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