Over the last 2 weeks, yellow/dry grass patches have started to appear around the edge of my lawn in different places.
I have looked online and possible causes could be weedkiller that has found its way onto the lawn (though I was careful to try and avoid this), and I also put some lawn grower down a few weeks ago and I have read that sometimes the nitrates don't get fully absorbed, but I don't see why that would only affect the outside of the lawn.
My main worry, as well as it looking unsightely, is that this will spread to the rest of the lawn.
The lawn is relatively new - about 8 months' old - and it was looking good until the other week !
Any suggestions on what could cause it / how to treat it without digging it up, would be appreciated.
I've attached a couple of photos from yesterday.