@g-man @Ware

Wondering if you guys can take a look and give your thoughts. Lawn looked great until about a week or two ago when it looked dry. I gave it a cut, .5lbs N /1000. Since then it's been consistently getting more yellow. I put down a spot app of fungicide in spots that appeared to have discoloration or rust. Not the same as what I'm seeing now.
1. Can you tell me what this is?
2. I think it's more than just drought at this point. Before it just looked dark and I water and it recovered.doesn't appear to be the case here.
3. Is it fungus? If so, what can I do and what can I do it with?

1) I cant tell what it is from images so far away.
2) 0.5lb of N is a lot in the dry weather we had. You did not described how much water you used. How many inches of irrigation and how often?
3) I dont know if it is fungus. What fertilizer? granular or foliar? It is just too many unknowns. Do you have a journal with your applications in the last month?

Lastly, you should never spot treat with fungicides. You have to do blankets since the fungus can develop everywhere and not just in spot.

 

@g-man @Ware

I can't tell you the exact amount of irrigation. It has been extremely wet for us here in July. We received roughly 4 inches of rain over a couple days in July which pooled and killed a spot in the back corner of my lawn.

I've applied was granular urea. At the same .5lb rate. I applied this on 6-26 and 7-28. I also spot sprayed with some Sledgehammer at the directed rates. That was very small and very specific spots. I didn't use the entire single use packet that was purchased.

I had one little spot of the rust looking fungus which is why o dropped some diseases in that spot. It seemed to clear that spot up. This is different looking than what that spot was.

 

do you have any before pictures?

I think some of it could be poa getting fried, that just occurred recently here in Ohio with the heat the last week and a half.

Assume you put sedgehammer down because you actually had nutsedge? If you put that down in heat it can bake the surrounding area, especially if you did this when it was hot recently.

 

@cleohioturf

I did have some nutsedge in a very small spot and only had 1 gallon of a total mixed solution in a handheld pump sprayer. The area I spot sprayed actually looks good and didn't even use the whole gallon.

I did have some poa annua I'm very small spots but I believe that already burnt off. Seems like It came and went. I was able to see the seed heads in those areas and it wasn't anything this drastic.

I believe this is July 1 and then today. I didn't have any poa a in this spot from what I remember in regards to having the seed heads.

 

what @g-man said, hard to see that far away. Does look like you got something but would need to see impacted areas closer.

Brown patch/summer patch hit a bunch in mid july-end july, those areas impacted then had a ton of heat during first of august.

 

@g-man @cleohioturf

Closer pics.

 

Took a look this morning and did not notice any mycelium, but we did have thunderstorms yesterday and potentially a little rain over night. Planning on hitting this a curative rate of diseasex later today.

 

I typed something yesterday while at the kids playground but then accidentally back on the cell phone.

I dont see a clear sign of fungus. Since you dont know how much water or how often plus the heavy doses of fast nitrogen, I think this is fert burn + drought. It looks like a lot dead leaves, maybe the crowns survived. The 4in of rain are gone from the root zone in 5-6days.

I would give it a curative rate of dihydrogen monoxide to get new growth from the crowns there. After a week, give it a 0.2lb of N/ksqft granular and keep watering. It wont turn green immediately.

 

@g-man

What are your thoughts about a preventative rate since it's been wet?

What are your thoughts about these three pics? It appears there is new growth coming in but the one pic with the blackish/rust has moved around the yard. These were the specific areas that made me think fungus. I mowed on Friday when it was real dry and the yard just seemed to explode from there. I do also have some green areas that received the same N dose.

I believe the 1st pic shows the area that I've seen move around the perimeter of the yard and up against cement.

 

@g-man
If your conclusion is the same after those last pics I will hold off on everything and apply H2O only.

 

I cant tell much other that it looks like dead spots. If money is not a problem, you can do a dose of azoxy.

Look at the radar. There is a line of rain moving across the midwest.

 

@g-man

Updated pic….

Planning on doing the quarter pound of N this week. You mentioned it will take some time to green back up, how long were you thinking? I've kept up on my watering and had some decent storms recently. Now that the weather here is supposed to be a little cooler I'm going to do the N and spray for some weeds.

Think I'll be able to get it back to what it was by the fall?

 

Have you checked for insects?

I recently had issues that look very similar to yours and it ended up being army worms.

I mixed up 1 gallon of water with 2 table spoons of dawn dishwashing detergent and flooded a 3x3 area and 6 army worms popped out.

I would test for insects just to rule it out.

 

@g-man

I'm getting ready to throw down that .25lb nitrogen and wondered if anything else would also help? I have some humic acid that could also go down. Still have some decent brown spots and wondering why else I can do to help this recover.

Thanks

 

Are you watering? How much? How often? How does it look now?

 

@g-man
I water every third day and it runs for almost 2.5 hours. I know that doesn't tell you how much, but I haven't been able to do the tuna can test yet. I was Leary to put down more N so I haven't since my initial mistake.

I was gearing up to do the fall N blitz when this happened. At this point just looking to have it recover.

 

I would do nothing until you do an audit

 

@g-man

So I purchased the measuring cups on Amazon as I'm not a tuna fan. I put them all over in the yard trying to yard the spots that are still brown. I believe the yard to be greening up as a whole but still some a lot of brown. I'm starting to think The Whole thing is an irrigation issue. I ran through a cycle with the sprinklers which is 16-18 minutes per zone. When checking the measurements in the cups it hadn't even covered the bottom. So at most, there was a 1/10th of an inch. The cups were mostly hit by at least two zones as well. Am I not running them long enough or is there something wrong with my sprinklers? I run the cycle every three days but supposedly that's only going to be 2 tenths. Is there something I'm missing?

 

16-18 mins isn't very long. I can see where your heads are based on the green circles in some of those pictures. Those small areas are getting enough water.

You need to run your zones until there is 0.5" in each cup (or thereabouts). Record the amount of time it takes then adjust your schedule.

But I would say lack of water is the majority of your problem.

 

@Harts

Just trying to gauge this out.

30 minutes per zone means it is going to run for 7 hours total and still might not be enough. Is that really accurate for others. Sprinklers running for 14 hours a week sounds expensive or is that really what it takes?

Thanks for the quick reply.

 

@Harts

Just trying to gauge this out.

30 minutes per zone means it is going to run for 7 hours total and still might not be enough. Is that really accurate for others. Sprinklers running for 14 hours a week sounds expensive or is that really what it takes?

Thanks for the quick reply.

I am not an irrigation expert so I can't give you any guidance, except to say that perhaps your system isn't set up to efficiently irrigate your lawn. You may have to take a deeper dive into your setup and post in the Irrigation side of the forum.

Hopefully someone with knowledge can chime in.

 

@Harts

Just trying to gauge this out.

30 minutes per zone means it is going to run for 7 hours total and still might not be enough. Is that really accurate for others. Sprinklers running for 14 hours a week sounds expensive or is that really what it takes?

Thanks for the quick reply.

I am not an irrigation expert so I can't give you any guidance, except to say that perhaps your system isn't set up to efficiently irrigate your lawn. You may have to take a deeper dive into your setup and post in the Irrigation side of the forum.

Hopefully someone with knowledge can chime in.

Thanks for your help.

 

Try running for 60min and tell me what the cup has. I'm willing to bet 0.41in

 

@Harts @g-man

The one cup didn't even have the bottom covered. The other had 2 tenths. It ran for 60 minutes.

Could there be something wrong with the nozzles? I have heard people talk about low water pressure but parts of the lawn are okay.

You can see in the pics, the cups are about 5-6 feet from the heads. Like it was said earlier…dark green spots mark the heads.

 

Ok, this will take some more investigation.

Can you draw up (paper and take an cell image) the rough location of the heads, distance between the heads, body type and nozzle?

Who install this system?