I mostly have questions to understand the problem.

You only did pgr to the front, right? How is the back looking?

How much irrigation/rain in inches?

1oz of ams/ksqft?

What was your carrier rate?

 

Sorry, but I saw the title and thought of this song :lol:

[media]https://www.youtube.com/watch?v=ivbO3s1udic[/media]

 

Sorry, but I saw the title and thought of this song :lol:

[media]https://www.youtube.com/watch?v=ivbO3s1udic[/media]

Yes... that was partially the intent.... too much love could kill it... just as sure as none at all...

 

Did you apply this within a 48 hour window of high air temps (=>80F)?

 

I mostly have questions to understand the problem.

You only did pgr to the front, right? How is the back looking?

How much irrigation/rain in inches?

1oz of ams/ksqft?

What was your carrier rate?

G-man,

Yes I only did pgr to the front and sides. Back is looking fine....

There was no irrigation until 3 days later, when I had my wife put the sprinklers on which put down 1/2 inch. Then there was rain all day Thursday. I had the sprinklers run this morning too.. Carrier was about 1.25 gal per thousand.. Yeah, Ams was about 1 oz per thousand..

Temps were in the low 70s all week. Yesterday was the first time we touched 80 all year..

 

I picked a random station east of Toronto (Ajax). It showed no rain from the 14jun to 21jun(0.5in). You irrigated on the 20jun another 0.5in. At first it looks like draught stress, but if the back is looking good, then it can be that. I know the first time the grass gets pgr it looks funky hence why I recommend a low dose.

I'm not worried about the 1oz of ams causing problems. 1g/ksqft is a good carrier rate.

So what about fungus? Is it getting worst?

 

My initial thought was fungus as well. Has the look of leaf spot somewhat.

Why did you mix the chelated iron with the fas?

 

I picked a random station east of Toronto (Ajax). It showed no rain from the 14jun to 21jun(0.5in). You irrigated on the 20jun another 0.5in. At first it looks like draught stress, but if the back is looking good, then it can be that. I know the first time the grass gets pgr it looks funky hence why I recommend a low dose.

I'm not worried about the 1oz of ams causing problems. 1g/ksqft is a good carrier rate.

So what about fungus? Is it getting worst?

I think I figured out my critical mistake that I just realized while double checking everything that I did.. I am so used to spraying and fertilizing my yard that I know the sizes of all the areas by heart and I just know how much I need to do. The area that I was spraying I assumed was 12,500 sqft (it is actually 12,280 sqft), but I round up cause I like even numbers and I can never get everything out of my tank.

I was trying to get this all done before it got dark on Sunday, and was thinking about all the other stuff I needed to get done before I left town for the week and was just going through the process I normally do. There was one big difference.
When I sprayed the back with Par-3 I also sprayed 3,300 sqft of side area that I normally include in the front 12,500 sqft. So when I was spraying the PGR I did not go over that area because I had just sprayed par-3 with AMS. So I actually only sprayed 9,100 sqft with PGR and FAS with a tank with enough for 12,500 sqft.. So all my rates were at 37% more than I had calculated.. So PGR was at 0.69 oz/1000.. AMS was at 1.37 oz/1000 and total iron at about 4.1 oz/1000.. Then it sat for 2.5 days with no water....

I still think these numbers should have been OK, but certainly not as conservative as I normally use. I guess the moral of the story is don't rush and think through what you are going to do.. I didn't even realize it until this morning when I was going over the areas and saying "I sprayed this and it looks like hell, I didn't spray this and it looks great.... WTF... Why didn't I spray this... I normally spray this with the front 12,500 sqft... Oh yeah, I did this with the PAR-3... Oh No I oversprayed everthing else...!!!"

 

My initial thought was fungus as well. Has the look of leaf spot somewhat.

Why did you mix the chelated iron with the fas?

Ha.. Good question that I knew someone would ask.. I had a 5lb bag of ferrous sulfate that was just under half full so about 32 oz.. I wanted to get a little more iron down so I threw in a splash of chelated iron (about 250 mL)..

 

I checked that weather station nearest my house and it shows 6 mm of rain on Thursday (so not a lot.. ~1/4")...

 

Update.... As I am the type of guy that can't just leave well enough alone, I decided to see what I could do to speed up recovery and try to continue on my lawn journey with a slightly lower HOC...

So today I diamond striped my backyard to make me feel better.. This is my reno from last fall.

Then I cut the front at 2".. Then single pass dethatched all 9,000 sqft of the grass I messed up with my Greenworks electric dethatcher. That thing is awesome.. Then I used my lawn sweeper to pick up the thatch.. Then mowed again at 1.75"... Then swept again. Then I mowed two more time at 1.75" in two other different directions...

The improvement is noticeable and if this greens back it will be really nice at this lower HOC..

It was a full day of work in the sun, but hopefully the start to getting this turned around... For now there will be no more striping in the front until things are shipmshape again. Thanks to everyone for helping me out.

 

Nice stripes in the back yard. Hopefully it's not too much stress on the lawn by dethatching it when we've got some summer temps on the way.

 

Nice stripes in the back yard. Hopefully it's not too much stress on the lawn by dethatching it when we've got some summer temps on the way.

Yes the summer heat is a concern for sure, but the hottest day the forecast shows for the next 14 days is 23C with most around 21C.. continuing the cool trend..

I will water it hard if needed...

 

Nice stripes in the back yard. Hopefully it's not too much stress on the lawn by dethatching it when we've got some summer temps on the way.

Yes the summer heat is a concern for sure, but the hottest day the forecast shows for the next 14 days is 23C with most around 21C.. continuing the cool trend..

I will water it hard if needed...

Yeah you'll probably be fine. Might want to re check that forecast though.

Toronto

 

Are you pulling a Whitby forecast? This is much different then I am getting..

 

It's Toronto. Straight from environment Canada. Is that accuweather your using? There forecasts are straight up poo. Always too low with there temp forecast. Unless your on Toronto island it's going to get hot this week. The trend is not our friend for cool season grass. It had to come at some time though.

 

It's Toronto. Straight from environment Canada. Is that accuweather your using? There forecasts are straight up poo. Always too low with there temp forecast. Unless your on Toronto island it's going to get hot this week. The trend is not our friend for cool season grass. It had to come at some time though.

This is the Weather Network.. It is for my house out in Newtonville which is only a couple of clicks from the lake.. Normally we are 2C lower than T.O.

 

Update.... As I am the type of guy that can't just leave well enough alone, I decided to see what I could do to speed up recovery and try to continue on my lawn journey with a slightly lower HOC...

So today I diamond striped my backyard to make me feel better.. This is my reno from last fall.

Then I cut the front at 2".. Then single pass dethatched all 9,000 sqft of the grass I messed up with my Greenworks electric dethatcher. That thing is awesome.. Then I used my lawn sweeper to pick up the thatch.. Then mowed again at 1.75"... Then swept again. Then I mowed two more time at 1.75" in two other different directions...

The improvement is noticeable and if this greens back it will be really nice at this lower HOC..

It was a full day of work in the sun, but hopefully the start to getting this turned around... For now there will be no more striping in the front until things are shipmshape again. Thanks to everyone for helping me out.

I hope the dethatching helps shape up your turf. Seems to have really pull up a lot of that dead grass

 

Scag,

Yeah, it really is amazing that little dethatcher... probably the best value for the money tool I have... that is just one pass.. I might do another pass in the other direction...

 

I think I must have massively overdosed the Tnex. What I have seems consistent with pgr overregulation.... yellowing and browning of the turf, damaged tips, some grass blueing wiphile other grass appears heat stressed.... I know I put down 37% more than I wanted, but I must have gone more than that and not realized.. I also did not mow when I applied which the label says can lead to some yellowing....

I am holding out hope that in a couple of weeks it will be back to normal...

 

I way over applied my first PGR application. I went with .4 oz/1000. It destroyed my lawn a week later. Looked heat stressed, yellow, looked like tons of thatch and all around terrible. It took over a month to start growing more than like 1/8 inch week. Then the rebound happened. Within 3 days it grew over 3 inches and out grew the ugly grass. I can say that after the rebound and new growth the grass looked awesome.

 

I way over applied my first PGR application. I went with .4 oz/1000. It destroyed my lawn a week later. Looked heat stressed, yellow, looked like tons of thatch and all around terrible. It took over a month to start growing more than like 1/8 inch week. Then the rebound happened. Within 3 days it grew over 3 inches and out grew the ugly grass. I can say that after the rebound and new growth the grass looked awesome.

Dang...I don't think that's a large dose at all?

 

I run .75 per k and have never had that problem.

 

I way over applied my first PGR application. I went with .4 oz/1000. It destroyed my lawn a week later. Looked heat stressed, yellow, looked like tons of thatch and all around terrible. It took over a month to start growing more than like 1/8 inch week. Then the rebound happened. Within 3 days it grew over 3 inches and out grew the ugly grass. I can say that after the rebound and new growth the grass looked awesome.

Wow... that dose seems low.. I put down 0.4 oz on mine and my neighbors lawn at the end of May without issue. I thought I went 0.5 oz per k this last time, but I was at 0.7oz... Still I thought it should be fine but I don't know the issue... I did not cut prior to or right after and that is recommended to prevent yellowing..

I appreciate you input. It gives me hope that it will get better. I does seem to improve a little each day. I don't think it has really grown at all in the last 2 days. I have been cutting every three to 4 days..

 

Here is a closeup of the worst area from Sunday morning.. After reading papers on PGR uses on golf course greens this seems to be the signs of over application/regulation. Since I think this is cause I have changed the thread title so it is easier for others to find.

"Over-regulation of turf can resemble other types of stress and often is confused with disease. The turf has a blue-brown color and putting greens have a patchy appearance. On closer inspection, the leaves generally are free of lesions but have a worn appearance with brown, shredded leaf tips. Occasionally, leaves will have lesions from diseases like dollar spot or leaf spot."