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October 15, 2012

Here is a mystery problem from two of our sports turf students, Joel Rieker and Kevin Hansen.  It is from a new Kentucky bluegrass grow-in on one of the new sand-based sports fields on campus.  It is showing up as patches from one to two feet in diameter.  Notice the close up of the turf in the third picture, showing a redish to purple discoloration on new growth.

I am suspecting a nutritional problem.  My guess is phosphorus and I am recommending a application of phosphorus as soon as possible.  I think that there is probably some fungal organism involved but I suspect that it is because the grass is deficient in phosphorus.  We may also try some chlorothalonil fungicide on a test area.  They will also do a soil test on the area and take a sample of the grass to the plant disease lab, but both will take some time.  It is the end of the season and we do need to act fast.

I could be wrong and I would like some feedback on this.  Has anyone seen this before on a bluegrass grow-in on sand?  If so what did you do about it.  Send the response to my e-mail, or put it on the comment section below.  Any ideas would be helpful.

Kentucky Bluegrass Mystery Problem

Kentucky Bluegrass Mystery Problem