2 different types of KBG, sections that don't blend

[mikesturf]

Took over a new lawn that is mostly KBG, rye and fine fescue (Chicago area). The faster growing sections of lawn are a lighter green, thicker and do not blend with the thinner, darker areas. It is not poa it appears to not be tall fescue. Outside of killing off with Round Up, is it worth slit seeding with KBG to try to blend everything in? Has anyone done this, will it help. Homeowners are VERY anal about their lawn. There are many areas like this throughout the entire lawn.

[jbturf]

ive got a customers lawn that looks just like that,
you know what -those patches came from the bagged patch master crap the customer put down in the this areas himself
i'm not sure on getting it to blend- if i had some budget to work with i
would probably increase the iron and start aerating and over seeding sping and fall

[mikesturf]

This customer is very picky and I don't want to give him any hopes of it looking better without knowing for sure. I have thought of slit seeding in the fall in hopes that it will blend better. Has anyone done this with success? I have attached a close up of one of the patches.

[shovelracer]

Sort of hard to see whats going on there, but look at how much grass is in the light areas and how thin the others are. Agreed probably some garbage patch job and there is too much seed in there. Depending on what species it may or may not regulate itself. Most likely rip those areas out and reseed. Doesnt look like a lawn to be anal about but to each his own.

[RigglePLC]

It could be patches of ryegrass. Maybe where some thin spots were seeded a few years ago. Wait for it to produce seed heads they are much different from Kentucky bluegrass. In any case--you probably have to kill and reseed or resod.

Although--some products kill rye and not blue--I think Corsair is one. But many lawns nowadays have both types of grass intermixed.
http://www.supremeturfproducts.com/PDF/riverdale%20pdf/corsair.pdf

[Whitey4]

It looks like creeping fescue to me. Does it tend to be more prominent in the ares that get only partial sun and significant shade?

I had this issue on my own lawn. I aerated (2 passes) and overseeded with a KGB, Rye and creeping fescue mix. This spring, the fescue took off (this is NOT Tall fescue) and I did some spot applications of Ironite which darkened the fescue a bit.

To paint a verbal picture, there is a large dogwood tree in the middle of my lawn. The southern side of the tree (eastern exposure) is all rye and KGB. The northern partially shaded side of the tree has these creeping fescue patches. They were 5 shades lighter than the rye/KGB, but the Ironite got it closer to a shade or two lighter than the rest of the lawn.

The patches in my lawn are far too big to be a sudden weed infestation... it's creeping fescue for sure. Just like these pics. I wonder if it's just new growth that will darken in time, but at least the Ironite helped a lot until I see what happens later in the season. As a side note, Red Thread has gotten to this fescue much more agressively than it has the rye/KGB side of the lawn....