Chas Hurst wrote:
wrote in message
ps.com...
To Chas and anyone else still interested, I had some weed grass growing
in my lawn that looked identical to the photo that Chas had provided a
few weeks ago. I let it grow to seed head and managed to identify it
as likely to be poa trivialis. Took it to the local county agri
service here and the expert there agreed. It's common name is rough
stalk bluegrass.

The bad news is that there is no selective herbicide for control and it
will spread. Roundup and reseeding, pulling, mowing it frequently
enough to limit seed formation, applying pre-emergent crabgrass control
in early Fall are some of the ways to deal with it.

Thanks for the follow-up Trader. I am currently mowing twice a week with a
bagger in an attempt to corral the seeds. So the pre-emergent applied in
fall will help control it.

Thanks again

Chas Hurst


Yes, the ag extension guy said pre-emergent applied again late summer
would help control it. Of course it won't stop what's there from
spreading by rhizomes. I got rid of the worst spots that I had couple
of weeks ago with Roundup.

I think mine came from some shade mix I used. It's confined to three
areas I seeded couple years ago. On the web, looks like contamination
has been a problem, particularly for grass mix for wet/shady areas, as
that is the environment it likes.

If what you have is poa trivialis, it should disappear with hot, dryer
weather.