Is this red thread?
I scarified my lawn in summer and it came back looking great (really green) for Sep/Oct once the rains returned. Now however it looks awful again. Is this red thread? If so should I get someone licensed round to apply fungicide or should I just feed the lawn?
The photo is of a relatively good looking part of the lawn fyi
The photo is of a relatively good looking part of the lawn fyi

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Leave until the Spring and then decide what needs doing.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
You could give it a high iron "feed" to green it up or wait for spring as suggested previously.
I would never use fungicide on a lawn, but a high nitrogen Spring feed might be appropriate.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
I'd do as punkdoc suggests - ie nothing, till spring. Lots of food just now can be really counter productive.
I live in west central Scotland - not where that photo is...
Totally agree with Punkdoc and Fairygirl. Your lawn looks as good as many at this time of year (and a bit better than mine
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I live in west central Scotland - not where that photo is...
Lawnsmith.co.uk sell both a high iron winter fertilizer and also a ferrous sulphate product that greens a lawn should you feel you want to apply something to your lawn.
As many have pointed out in this thread, don't use anything with much nitrogen in it. You don't want encourage new growth over winter. Don't make that mistake.
The easiest and cheapest option is to leave it till the spring.