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Paging Ronk/grass experts - zoysia issue
Posted on 5/12/25 at 4:36 pm
Posted on 5/12/25 at 4:36 pm
This is Palisades Zoysia in its third year. Full sun. It's like in an odd states of being 50% greened up. Top-dressed and leveled last year and it did great. I put granular prodiamine out in February, and fertilized at the beginning of April (south LA). Also spot treated on green up with Tebuconazole, but only where brown patch seemed to be.
At first, I thought it could be freeze damage or just not greened up all the way, which may still be the case, but we laid some new sod to cover an additional area in the back last fall and it's doing great. It's just the 3 year old grass that's struggling. Any ideas what might be going on here? It is not limited to circular areas like zoysia patch. Much broader/widespread. Is it large patch? If so, what should I do? Let it work itself out?
At first, I thought it could be freeze damage or just not greened up all the way, which may still be the case, but we laid some new sod to cover an additional area in the back last fall and it's doing great. It's just the 3 year old grass that's struggling. Any ideas what might be going on here? It is not limited to circular areas like zoysia patch. Much broader/widespread. Is it large patch? If so, what should I do? Let it work itself out?
This post was edited on 5/12/25 at 4:39 pm
4
Posted on 5/12/25 at 4:39 pm to atom1505
I see fungus signs in the bottom of the photos.
Posted on 5/13/25 at 6:10 am to Neauxla
quote:
I see fungus signs in the bottom of the photos.
Same
Posted on 5/13/25 at 6:43 am to Ziggy
Gotta be gray leaf spot.
Go on the heavy side of the disease ex or equivalent
Go on the heavy side of the disease ex or equivalent
Posted on 5/13/25 at 7:25 am to atom1505
There is a little leaf spot going on. One thing about any zoysia variety is you will not tell it what to do. It will do what it wants to do when it wants to do it.
Posted on 5/13/25 at 7:44 am to atom1505
I replaced St Augustine sod that was disease-ridden with Empire Zoysia a few years ago and it looked great for the first year. During the summer of 2023 (exceptional drought), I watered it almost daily and it did well. Around September of 2023, it took a "turn for the worse" and started to look very similar to this. I ultimately replaced it with artificial turf (reasonable cost-wise as it was only ~500 sq ft) and never looked back 
Part of it was out of spite of wasting hundreds of dollars in water to keep it alive for it to ultimately do what it wanted to do in the end.
I've since then sold that home and put down TifTuf Bermuda at the new. So far, so good.
Part of it was out of spite of wasting hundreds of dollars in water to keep it alive for it to ultimately do what it wanted to do in the end. I've since then sold that home and put down TifTuf Bermuda at the new. So far, so good.
Posted on 5/13/25 at 8:37 am to ronk
quote:this. I also find cutting it lower will reduce fungus. Zoysia loves to be cut short. Maybe do a scalp and try raking up dead spots. I power rake with sunjoe every year. Going to look like shite for a few weeks but it will start to green back fast.
One thing about any zoysia variety is you will not tell it what to do. It will do what it wants to do when it wants to do it.
I don’t fertilize until right now with zoysia. Mine is just greening up nice. It’s just hard because you see your neighbors centipede green for weeks now and yours is still waking up. My peak yard is not until September when most people are starting to shut it down.
Posted on 5/13/25 at 8:38 am to tigerbater
quote:
I've since then sold that home and put down TifTuf Bermuda at the new. So far, so good.
Posted on 5/13/25 at 8:43 am to Art Vandelay
In hindsight, I think I was cutting my zoysia much too high (~3"). That was probably part of my problem. I always ended up with a lot of "dead" blades that had to be raked out.
Posted on 5/13/25 at 8:51 am to tigerbater
quote:Yeah man. Zoysia much prefers to be maintained around this height (not my lawn):
In hindsight, I think I was cutting my zoysia much too high (~3"). That was probably part of my problem. I always ended up with a lot of "dead" blades that had to be raked out.
Posted on 5/13/25 at 8:55 am to ronk
quote:
There is a little leaf spot going on. One thing about any zoysia variety is you will not tell it what to do. It will do what it wants to do when it wants to do it.
Should I treat the whole yard or let it work itself out?
Posted on 5/13/25 at 8:56 am to Art Vandelay
quote:
this. I also find cutting it lower will reduce fungus.
What's your cut height?
Posted on 5/13/25 at 8:59 am to atom1505
quote:Everyone should be applying at least a preventative rate of Azoxystrobin every spring (Disease ex). There are other active ingredients that Ronk may wish to speak to.
Should I treat the whole yard or let it work itself out?
I'd put out a preventative rate all over and a curative rate in the worst spots (if there's a huge difference).
I see that you've already used a fungicide. My apologies.
Mow, mow, mow.
This post was edited on 5/13/25 at 9:14 am
Posted on 5/13/25 at 9:07 am to atom1505
quote:
Should I treat the whole yard or let it work itself out?
I would treat the entire yard and bag clippings at least for the next few cuts. Maybe treat again after a few weeks as well.
Posted on 5/13/25 at 9:13 am to atom1505
quote:Just curious, what did you fertilize with and how much did you use? Mowing lower and more frequently will improve 100% of bermuda and zoysia lawns. And I agree with other about raking out that dead stuff.
atom1505
Posted on 5/13/25 at 9:19 am to bayoubengals88
quote:
Just curious, what did you fertilize with and how much did you use?
16-2-3 at 4lbs per 1000sqft.
quote:
Everyone should be applying at least a preventative rate of Azoxystrobin every spring (Disease ex). There are other active ingredients that Ronk may wish to speak to.
I'd put out a preventative rate all over and a curative rate in the worst spots (if there's a huge difference).
I see that you've already used a fungicide. My apologies.
Mow, mow, mow.
I just spot treated with Tebconazole. I didn't do a treatment of the entire yard. I'm going to work a granular fungicide into my early spring maintenance next year though. This is half an acre of grass so it's quite a bit to reat.
This post was edited on 5/13/25 at 9:21 am
Posted on 5/13/25 at 9:26 am to atom1505
quote:.64 lbs of nitrogen should be enough to start the year.
16-2-3 at 4lbs per 1000sqft.
quote:Yep, I missed that at first.
I just spot treated with Tebconazole. I didn't do a treatment of the entire yard. I'm going to work a granular fungicide into my early spring maintenance next year though. This is half an acre of grass so it's quite a bit to reat.
Posted on 5/13/25 at 9:30 am to bayoubengals88
Thanks for all the input. My current cut height is 3". I'm going to treat the entire yard with liquid Tebuconazole and work the cut height down to 2" over the next couple of cuts. If it still looks thin in mid June, I'll do a granular app of the other fungicide. Then hopefully fert again towards the end of June to bring it back. Plan seem good?
Posted on 5/13/25 at 9:35 am to atom1505
quote:I don't think you'll need another fungicide after the heat and lower mowing. It should be growing good soon.
If it still looks thin in mid June, I'll do a granular app of the other fungicide.
Check this page out from Clemson
Posted on 5/13/25 at 9:57 am to atom1505
You can also treat with propiconizole. Bringing down the mow height should help with the look. I think most of the dead grass is just thatch from over the years. Zoysia will need to be thatched/scarified at some point. Normally every 3 years is enough.
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