Cant cure disease

Cool season grasses like Kentucky Bluegrass, Fescue & Rye
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Tydaboss89
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Joined: Wed Sep 26, 2018 6:17 am
Location: philly area
Grass Type: turf type tall fescue
Lawn Size: 1000 square feet
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Cant cure disease

Post by Tydaboss89 » Thu Jul 11, 2019 12:38 pm

I have a TTTF lawn. Started spotting disease about a month and a half ago. since then I have sprayed down 2 apps at a curative rate of propiconazole 14 days apart. I used this last year with great success but this year it seems like it just wont go away. I still have brown/ black lesions on some of the leaf blades though out the lawn. A lot of the grass is still very healthy but overall it has a brown/yellow/orange coloring mixed in with all the green. It does not look horrible but I know that something is still off. we have also had A LOT of rain here in PA for the last 2 months. I starting to think the lawn wont start looking good again till the fall. I am out off ideas on what to do. PLEASE give me some advise or ideas of anything I could do to help bring my lawn back to the level I know it can be!

Thanks Ty

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Harts
TLF Supporter
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Joined: Mon May 14, 2018 6:50 am
Location: Mississauga, Ontario, Canada
Grass Type: KBG / PRG
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Re: Cant cure disease

Post by Harts » Thu Jul 11, 2019 2:24 pm

Can you post pictures of the lawn as well as close ups of the grass blades? We need to identify what the problem is before we can offer advice.

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Kaba
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Location: GTA Ontario (6A Canada)
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Re: Cant cure disease

Post by Kaba » Thu Jul 11, 2019 2:46 pm

If the disease has too strong of a foothold many extensions that I have read information regarding residential lawn disease do not recommend applying fungicide after strong emergence due to the costs and the low probability of complete eradication.

From Purdue on melting out disease:
Application timing is critical for satisfactory fungicide
performance. Apply sprays at the first sign of the leaf spot stage
of the diseases, or apply them preventatively when disease-
favorable weather arrives. Once large areas are blighted to the
point of crown infection and plant death, the disease pressure
will be too great to be confident that a single application will
provide adequate control. Even repeated fungicide applications
may be only marginally effective in such cases.

Ge0rdi3brit
Posts: 59
Joined: Wed Aug 29, 2018 9:55 pm
Location: Charlotte, NC
Grass Type: TTTF
Lawn Size: 14000sqft
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Re: Cant cure disease

Post by Ge0rdi3brit » Thu Jul 11, 2019 3:30 pm

Have you thought about a different fungicide with a different moa? You mentioned you used Propiconazole last year, perhaps your lawn has built a tolerance to it.

tgreen
Posts: 564
Joined: Sat Oct 20, 2018 7:26 am
Location: transition zone
Grass Type: tf and kbg
Lawn Size: 20k
Mower: 48 turf tracer

Re: Cant cure disease

Post by tgreen » Thu Jul 11, 2019 5:05 pm

I would try Scott's diseasex with azoxystrobin. Based on the time of year, description and your grass species it is very likely brown patch.

Every expert I have ever read says propiconazole and the other homeowner products don't work on brown patch. There is one study that suggests propy makes brown patch worse. There are people on the forum who say it does work and I won't argue with their personal results. Here's a link to a turf pathologist discussing brown patch that might help you (scroll down halfway). Good luck.

https://turfpath.missouri.edu/reports/2019/06_28_19/
Last edited by tgreen on Thu Jul 11, 2019 5:05 pm, edited 1 time in total.

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g-man
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Re: Cant cure disease

Post by g-man » Thu Jul 11, 2019 5:18 pm

^ +1

From the rutger report: "For high-maintenance tall fescue lawns, ready-to-use fungicide formulations available to homeowners typically have performed poorly in research trials (with azoxystrobin being the only known exception)"

- http://www2.ca.uky.edu/agcomm/pubs/ppa/ppa1/ppa1.pdf.

Propi (a DMI) is acceptable but not always and it also needs a 10-21 reapplication.

It is a great read for brown patch. I want to also highlight all the summer, pgr and granular comments they wrote in there.

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troksd
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Grass Type: TTTF, KBJ, Creeping Fescue
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Re: Cant cure disease

Post by troksd » Thu Jul 11, 2019 6:09 pm

Interesting and educational.
g-man wrote:
Thu Jul 11, 2019 5:18 pm
^ +1

From the rutger report: "For high-maintenance tall fescue lawns, ready-to-use fungicide formulations available to homeowners typically have performed poorly in research trials (with azoxystrobin being the only known exception)"

- http://www2.ca.uky.edu/agcomm/pubs/ppa/ppa1/ppa1.pdf.

Propi (a DMI) is acceptable but not always and it also needs a 10-21 reapplication.

It is a great read for brown patch. I want to also highlight all the summer, pgr and granular comments they wrote in there.

Tydaboss89
Posts: 10
Joined: Wed Sep 26, 2018 6:17 am
Location: philly area
Grass Type: turf type tall fescue
Lawn Size: 1000 square feet
Mower: Honda self propelled

Re: Cant cure disease

Post by Tydaboss89 » Thu Jul 11, 2019 6:36 pm

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Tydaboss89
Posts: 10
Joined: Wed Sep 26, 2018 6:17 am
Location: philly area
Grass Type: turf type tall fescue
Lawn Size: 1000 square feet
Mower: Honda self propelled

Re: Cant cure disease

Post by Tydaboss89 » Thu Jul 11, 2019 7:35 pm

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tgreen
Posts: 564
Joined: Sat Oct 20, 2018 7:26 am
Location: transition zone
Grass Type: tf and kbg
Lawn Size: 20k
Mower: 48 turf tracer

Re: Cant cure disease

Post by tgreen » Thu Jul 11, 2019 7:52 pm

That lawn looks better than 95% of the lawns in the transition zone in July so you should be feeling good. I understand your concern with an off-color that doesn't look as good as what you had in the spring. I don't see that as obvious brown patch but the only way to be certain is to dig up a sample and send it to a turf path lab. No one on this forum is going to be able to positively identify fungus from the pics. The link is below. Good luck.

https://njaes.rutgers.edu/plant-diagnostic-lab/

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