Could be a water issue, could be a fungal issue. Have you seen any lesions on grass blades? Any mycelium in the early morning dew? That would indicate a fungal problem. If you have trouble getting a screwdriver in the ground or leaves change to a duller color or curl up into a tube or the grass doesn't spring up after you walk on it, that would indicate a water issue.

I think it's leaf spot Becky. Based on:

http://www.turfmagazine.com/lawn-care/how-to-control-top-turf-diseases/

and

http://homeguides.sfgate.com/spray-grass-leaf-spot-51937.html

I'm going to apply some fungus treatment....keep you posted.

Used this:

http://www.jonathangreen.com/product/lawn-fungus-control.html

Look at the sites I mentioned in the thread "too little water, too much water." It has an ID tool and then info on treating fungus. Keep your grass blades as dry as possible as long as possible.

Where do you live?

What kind of grass?

NNJ.

KBG.

I should have asked before. What is your watering schedule? How often and for how long?

Here is a picture showing deep and infrequent watering (1 inch every 5 days in this case) for KBG in Eastern PA, not far from you.

dchall-

Thanks, yes I know that picture; I've seen you post it many times.

I have been adhering to the "deep and infrequent" method, but this Spring we had a tremendous amount of rain. My lawn is on a slope, and I think there may be a drainage issue.....which maybe resulted in the fungus (leaf spot)

LOL Dchall. For every lawn watered deep and infrequent that looks like Mopheuspa's pic, there are 10 more that look average at best.

Update:

A week and a half after applying fungus treatment, I took this just now after mowing:

Also, I'm thinking about some milorganite to green it up a bit......

not sure what you are expecting for summer conditions. didn't look like you needed a fungicide. if you have non-elite KBG, that is the turf quality you would expect for summer.

Yes, I'm going to do milorganite tomorrow and hopefully it greens up a bit....

As posted another thread:

I just did the grass ID that Becky posted: I seem to also have fine fescue rather than KBG.

Then I looked up maintenance for it, and sure enough, it doesn't like a lot of water and will develop fungal issues.

I am having the same issue. I applied a fungal control and it seems to be getting better. I also have decided not to apply milorganite as fescue should not be fertilized in the summer.

My 2cents.

mishmosh said, LOL Dchall. For every lawn watered deep and infrequent that looks like
Mopheuspa's pic, there are 10 more that look average at best.

That could very well be true, statistics being what they are. Sadly we don't get a lot of feedback to the forum about what works and what doesn't. Every now and then someone will write back to thank us and among those thank you notes, there is the occasional person who says that changing from frequent watering to deep and infrequent made all the difference. The other occasional feedback I see is that mowing at the mower's highest setting instead of the lowest setting made all the difference. But as you say, for every 1 there are 10 others. It could be the 1 in 10 person sends the feedback. Morph's picture is good because it shows the difference side by side instead of before and after. I quizzed him heavily on the differences between his (over analyzed) lawn and his neighbors. To review the details, his lawn is an improved variety of KBG, soil is heavy clay (one of the few), tested and adjusted ad nauseum, fertilized during the year with organics, winterized with chemical fertilizer, and treated as needed with -icides. Oh and in the hottest parts of summer he waters every 5 days. His neighbors have none of those tune-ups, but morph insists the main difference in appearance is the watering schedule.

If you want to see his mother's lawn, which is the same contractor grade of KBG as you see in his neighbor's lawns, I have pix of that, too. Her lawn looks much more like his than it looks like the neighbors' lawns.

The appearance of his lawn is mainly due to watering schedule??? That is laughable. Then why did he choose to renovate (or is that a new home build?) with elite KBG cultivars? Why does he spread over a TON of organics annually? Don't forget the intensive iron sulphate sprays. About the only thing he doesn't throw in there is PGRs. To be clear, his turf managment is extreme.

Try showing us another lawn with common KBG under the same watering schedule and under the same conditions that looks as good as Morpheus's pic. You won't find one.

What bothers me is that when I went my my nursery and asked for grass seed that does well in full sun, that's what they gave me: a "Full Sun Mix" which was suppossed to have KBG, some Rye and Fescue.

Your lawn looks like mostly KBG to me. The main difference between yours and say Morpheus's lawn is the elite KBG, IMHO. Even with the best management, your lawn will only look so good. It transiently can look better by practices that are unsound like dumping nitrogen right now. The differences are more stark during summer conditions and not so great during spring and fall. But make no mistake, there is an obvious difference in "elite" cultivars compared to old.

"What bothers me is that when I went my my nursery and asked for grass seed that does well in full sun, that's what they gave me: a "Full Sun Mix" which was suppossed to have KBG, some Rye and Fescue."

KBG, rye, and turf type tall fescue ARE a full sun mix. If that's what you planted, you should have that in your lawn. Some may have thrived better than others. A sun and shade mix often has KBG and fine fescue. It's assumed that the KBG will do well in the sunny portion of the yard and fine fescue will do well in the shady portion. Turf type tall fescue and fine fescue are two different kinds of grass.