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Old 05-11-2013, 08:39 PM
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rlmlandscape rlmlandscape is offline
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Help with disease identification

Have a lawn customer that seems to have a disease spreading in her lawn. I do not do the applications for her property she has another company do them. One of my guys was there on Monday and she was pointing the spots out to him. I came to cut on Friday and the areas appear to be dead. Is this red thread or a form of fungus causing this. Turf grass disease is my Achilles heal so any help is much appreciated.
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Old 05-11-2013, 10:41 PM
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RigglePLC RigglePLC is online now
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Not sure. Its early for red thread.
http://plantclinic.cornell.edu/factsheets/redthread.pdf
Top photo shows slight evidence of wheel tracks going left to right. Such tracks are an indication that it was mowed when dry. Its called "heat tracks". So I suspect that the lawn had some dry spots. Dig down in the soil and check for adequate soil moisture. Even if it is moist now, the problem could have occurred a few days ago and the grass has not yet recovered.

Last photo looks a bit different. Is the irrigation running well? Could have been dry, but it is hard to tell what angle of slope you have. Is this the spot that gets the most sun? Injury also resembles what would happen if there was poor drainage in the spot. Or likewise if pool water overflowed into that spot. (Particularly if an algicide was used in the pool.)
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Old 05-11-2013, 11:34 PM
maynardGkeynes maynardGkeynes is offline
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Photo 3 looks like brown patch lesions to me.
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Old 05-12-2013, 09:52 AM
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rlmlandscape rlmlandscape is offline
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To give some more info on the weather we have not had any hot days yet the temperatures for the past three weeks have been in the mid 60s with a day or two in the low 70s. We had a three week period of no rain up until yesterday and I am not sure if their sprinkler system had been turned on yet. I will call and find out today. I have also noticed a spot like this on another lawn yesterday and I will grab a photo of it today while I am there working.
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Old 05-12-2013, 01:56 PM
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countryclublawnllc countryclublawnllc is offline
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Help with disease identification

Dig around a little and look for some grubs.
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Old 05-12-2013, 06:30 PM
Smallaxe Smallaxe is offline
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Did it start last Fall??? Is it possible that it is a variety not yet fully alive from dormancy??? I still have areas that look that way, but I am not RI...
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Old 05-12-2013, 08:43 PM
jbturf jbturf is online now
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it been nearly 4 weeks with no precip in my area until several days ago, temps mostly 60-70 with a few 80 days, and a lot of windy days, this has equated to a lot of drought stressed turf around here, I suspect rlm you've had very similar. susceptible host + environment +pathogen

I think riggles right also, ive seen heattracking from mowers very recently
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Old 05-12-2013, 09:25 PM
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rlmlandscape rlmlandscape is offline
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Thanks for the help. I'll take a look for grubs since this was a fear of mine but thought it might be to early for signs of them to start showing up still. This turf was very green and in good shape three weeks ago when we first started cutting. The decline in the turf has happened over the last two weeks. It is a new account and the areas were nice a green a couple weeks ago.
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Old 05-12-2013, 10:07 PM
Hissing Cobra Hissing Cobra is offline
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I don't think this is a disease as I feel that it's a bit too early for those to be kicking in, especially without any moisture in the past 3 to 4 weeks. This looks like typical drought stress to me. Was the lawn fertilized a week or two before this damage showed up? The combination of the fertilizer breaking down without moisture being present for almost a month could have sent it over the edge. My guess is that these areas will recover with regular watering and a good mother nature soaking over the next few weeks.

Things are very dry out there and according to the news last week, the potential for forest fires was very high for our area of Massachusetts & Rhode Island. Prior to the rain of the last few days, there's been nothing in the way of moisture. While you're checking for grubs, also be on the lookout for chinch bugs!
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Old 05-12-2013, 11:46 PM
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DA Quality Lawn & YS DA Quality Lawn & YS is online now
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I was gonna say, probably drought stress. Esp by that pool.
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