Help with recent new lawn

See the attached pictures

I have a fairly recent new lawn which is coming on nicely apart from a little bit.

Looking at the picture of the whole lawn it's the top right.
Is this damage due to not enough sunlight ?

Any help and guidance is much appreciated.

 

Welcome to GC Sootylfc. No, I don't think it's due to lack of sunlight. It could be that the soil underneath those patches isn't as fertile as elsewhere.

Your lawn is in need of cutting so see how it looks after the first few mowings, if it doesn't look any different report back and we'll take it further.

 

Sooty have a look at the tips as the photos show a colour on the grass effected but I'm not sure if it's the camera colour that's wrong.
You are looking for little bits of red on the tips of the grass.
I took some photos on Friday showing red tips found on Red Thread which is showing up recently due to the weather pattern.
I've included a photo of a lawn I look after which has this problem and no man made chemicals are used just eco friendly products from natural sources. I've also included a photo of a lawn which another company looks after that's missed the first signs and shows what happens when it's left to its own devices.
I'm not saying it's this but as many of colleagues are reporting outbreaks it's worth a mention.

 

That's for the help.

There is no red on the tips of the grass.

I have cut the grass today and here is the update.

Is it due to the water flowing down and it becoming too damp??

Also am I cutting the grass the right way to keep the grass well?
As you can see it's hard to get close to the grass near to the fence near the bottom as the grass box and handles stop this.
Thanks for the help.

Sooty

 

Would you say the patches of grass turned yellow, then brown and then just died?

Cut looks fine, rare to see water damage in a single spot on the turf unless it's over an area that has something under it and you see standing water in that one area.
If I was there I would probably lift a section or two to see what's in the soil as grubs can create spot areas of damaged turf as they feed off the roots.
I take it you have not applied any type of chemicals around the garden?
Did the areas appear roughly at the same time?
Early morning do you notice any kind of web like appearance on the areas that have shown this problem?
Any pets?
Do you have any any visiting guests like foxes?
Have you applied any lawn treatments?

 

The lawn was put down first week of July.

No chemicals around the garden yet or any treatments.
I have no pets
I haven't seen any webs around the area but will check.

I have CCTV over the area so will check it over different nights.

 

Could it be squirrels doing it to my lawn

This is from my CCTV this morning - nipping at two pieces of lawn

 

Squirrels tend to dig. I can see some webbing or what looks like web formation on one photo but it's not very clear.
Identifying diseases On turf is very hard from web photos. Sometimes a Ph meter is handy as that can be used to see signs of problems like Take-All patch which is small patches of failing grass with rotted roots and shows a rise in Ph levels. It also helps to know the grass type as this mainly attacks Agrostis.
A lot of lawns use Rye grass and Red Fescue and if you have a web like appearance on the leaf it could be what's called Pink Patch and this is normally found along side Red Thread.
It could also be what's called Damping off.
Along with a few more diseases and pest problems it's very hard to tell what's going on and to be honest unless it's showing a give away appearance it's almost impossible to say what's going on which is where a local turf specialist comes into it as they can see first hand what's going on.
Often if it is a turf related disease you find 2 diseases populating the same area but in your case we don't know if it's soil, pest or disease related.
You need to work out if the cost of getting in someone is worth it to the relationship of your problem, you could try removing the area and reseeding or add a small patch of turf from the same supplier so it matches the turf already in place.

 

Here are some pictures as of today.

Am I worring too much about greeness of the grass?

Does the patches look to have improved ?
During the recent dry spell I have been watering.

 

Looks ok to me from your photos.

 

My lawn is about 3 months old.

I have started getting some weeds ( see attached pictures)
How should I treat these ?
Is my lawn too new to add lawn weed killer too ?

 

Too early to treat. Pull them out by hand or a weed puller.

 

Most domestic herbicides are around 2 months if you look at the manufacturers notes. However the ones you have to mix need a little care as its not uncommon for people to believe in mixing a stronger mix than is quoted thus causing issues. No matter what labels quote be it herbicides or seeds people always tend to ignore them then have an issue and then blame anything but themselves for problems.
We also have a dip in temps and so the effectiveness is altered, takes longer to work, may not fully work on some types of weeds that show resistance .