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Heat Stress or Fungus?

4414 Views 17 Replies 6 Participants Last post by  shadowlawnjutsu
Hi everyone,

First post here, long time lurker.

A little about my problem:

Lawn planted last year in Aug. in Western WA where it rains 8 months out of the year.
PRG and Fine Fescue mix, mowed at 3", blades just sharpened by me.
This last few weeks have been in and out of the 80's and into the 70's with high humidity.
I currently water 0.5" at a time every 3-4 days as weather dictates.
Nutrients were nearly all on target as of April via a soil test sent to SoilSavvy. I need to find potassium somewhere.
I did not put down a prophylactic fungicide treatment, I now know better.

I've been having random blades of grass throughout the lawn turn brown from the root upwards, most of it seems to be seed stalks. I've spot treated for red thread here and there, and treated for rust disease last year as well.

I figure this is a fungus problem, but it's not patchy like most fungal problems, it's literally everywhere across my lawns mixed in. I went ahead and did a foliar application of Propiconazole at 2oz/1000sqft, letting it dry. I just ordered some azoxystrobin granules (Scotts) to put down and see if that helps too.

I just want to see if I'm on the right path or not.

The second picture is of from some rust disease, but it's not typical pattern like it was last year.

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I have the same situation with brown stalks and some dormant blades, and a touch of disease. It's summer now and it's hard to avoid if you have ryegrass.
NanserbE said:
Is there anything I can do in the future to keep the brown stalks from dying off?

Mow more often? Taller or shorter? Fertilize more or less?
I don't think there's much you can do. My lawn still has new ones growing!
g-man said:
@Green so there is something we could do for seedhead suppression. Previous years seedheads were a minor problem for me, but this year I had more than I wanted.

The product is called ethephon (Proxy) and it is another plant regulator. It gets mixed with primo (t-nex) and applied prior to seedhead development to suppress them.

I think @HoosierLawnGnome uses it. Im likely going to buy some for next year.
Your're right! And he does use it. Not my thing, but go for it!
g-man said:
T-nex works great on all lawns. You just have to find the right rate for your lawn. Start small and go up.
Yeah. The first year I used it, I used full rate and had bad spray technique, so over regulated. This year I'm using lower rates. Still have to mow about once a week at 3.75 inch HOC, but less fungal issues so far compared to in the past.
NanserbE said:
Is there a positive health response overall? Thicker? Greener? Fuller?

Or is it just that you end up having to mow less often?
It does tend to thicken the lawn noticeably, as well as darken the color.
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