[gm560]

I have attached a picture of my back lawn from the second story of my house. This was actually taken 2 weeks ago, but you should be able to see the light green spots all over. I have reason to believe it's Poa T.



My question is, I am planning a full reno in the fall, however I believe the Pao T should die over the summer. If I nuke the lawn in late summer, will the Poa not be actively growing and then just come back in my new lawn next spring? Should I go after those spots now with Roundup? I would rather not have bare dirt all summer long, but it beats an invasion of my brand new lawn next spring. Thanks!

 

[ericgautier]

Could be Poa T. Do you have Tenacity? If so, do a highlight spray and see if they turn white.

If it were me, I would go after those spots now rather than later.

 

[gm560]

I can try that.

 

[g-man]

Poa t does not die in the summer. It goes dormant. Spring round up is the best approach, but first make sure the light green is poa t.

 

[gm560]

Welp, I think I confirmed it's Poa T. How, you ask? Well I dug up a the 5 lb bag of shade mix I scattered in the fall in thin spots on my back lawn. Lo and behold, 10% Sabre III Poa Trivialis. I feel pretty dumb right now. Any tips on dealing with it. Does this "improved" (according to some of the seed websites), differ from the prescriptions above? Round up now and kill half the lawn?

 

[fusebox7]

Any tips on dealing with it.

You should start the reno now since you're doing a planting in the fall. You won't have bare dirt per se but you'll have straw-colored stubble all summer. I'd recommend glyphosate on the whole area now, followed by several rounds of fallowing (waiting period of watering and regrowth) then repeat the kill, repeat the fallow, repeat the kill...

Poa trivialis is known for sticking around despite thinking you've killed it all. Do your best to kill it now while it's growing aggressively and wait until fall to plant your new non-poa-trivialis seed Also, you can keep poa trivialis out of dormancy in the summer (depending on your typical summer temps) by breaking the typical "rules". Water a lot and fertilize heavily. This will help your fallowing results.

 

[gm560]

Nuking it now is going to be a tough sell with the wife. Maybe I just do it when shes not around and pretend I have no idea what happened....

 

[fusebox7]

Understood. Anyone who has dealt with poa triv will tell you the same thing: earlier is better. Blend that with real life and do what you're able to. If you can keep everything lush and alive through summer then make sure you do a couple rounds of kills before planting in fall and you'll be in decent shape. At least if it ever comes back there should (hopefully) be far less of it and you can manage the spots with spraying digging and plugging. Good luck!