I have attached a couple pictures of my front yard. You can see it is obviously two toned. It's lighter green (which I believe is kbg and pr; 2nd picture) in the front-right of the picture, then there is a nice dark green area to the front-left with a strip of dark grass coming off of it towards the middle (which I believe is fescue; third picture), then beyond that it is lighter green again with the kbg and pr. I had this issue in my backyard, so I put a little extra crab grass preventer over the strip and it did a decent job at stopping the spread, and I feel it even reduced the size of the river of fescue. I'm trying to get the lawn uniform with kbg. Yes, there are small apple trees, but they don't create all day shade. Just curious if my identification of kbg+pr and fescue is correct, and if my idea of stopping the fescue from spreading via crab grass preventer in the spring will work. I don't need an immediate fix. If it spans multiple seasons that's ok with me. I don't want to dig up a strip of sod through my front yard. This fall I will be aerating the yard, then overseeing with kbg only, starter fertilizing, and putting Milorganite down as well. In the spring the crab grass preventer will go on the yard again and heavily over the fescue along with Milorganite. Thanks for the tips and let me know if you need any more pictures for proper identification.

Yes, I know the kbg looks darker than the fescue in the closeups, but the fescue is much darker like in the first picture.