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How often does that lawn get a cut? Anything longer than weekly will encourage stronger grasses to flourish. We have had a problem with patches of soft Yorkshire Fog, but that doesn't tend to take over the whole lawn like the one shown.
Hi Colin, apparently this is a bad year for weed grasses due to the weather we have been having. Well that's what everyone has been telling me. I am sure that that hasn't helped the situation but I believe that this lawn is weak and unhealthy and that is why the grass has invaded. We do cut the grass fortnightly and this lawn also has a Feed & Weed 3 times a year but we have other lawn that receive the same treatment and look great (hence the soil samples). The lawn now appears to be mainly fescue grasses which would indicate that the lawn suffers from drying out as fescue grasses can tolerate this. I feel responsible with this one as the client has been with me a long time and I would like to get it right for him. My plan is to scarify, aerate, top dress and over seed. My supplier has suggested I just returf but whats the point if its going to deteriorate back to this again in a few years time? Anyway I think your right about it being Yorkshire fog. I am going to attach a few more pictures so you can see more.
looks like yorkshire fog - It likes LOW Nitrogen conditions but is otherwise unfussy.
Cutting lower will hit it hard, as will high N.
Worth upping the N level of the feed and doing a few low cuts, then a few high ones to let the other grasses smother it.
I've had fields come full of it in the past, and its usually a warning the soil is getting worn.
For a patch that size, i would go with the re-turf.
All the topdressing/aerating/scarify in the world won't kill off the weed grasses in that lawn.
Sometimes your better to take the hit and fix it. Then in the future change the maintenance programme to include yearly aeration/scarification to encourage the grasses you do want.