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RSL
08-22-2008, 08:11 PM
Some Lawns Getting Yellow Patches Ranging In Size From 1- 12ft. In Diameter Looks Like Iron Deficient But Leaning Towards Fungus Any Suggestions

americanlawn
08-22-2008, 09:02 PM
Without pics, I'll guess Summer Patch. Check out Purdue University.

RigglePLC
08-22-2008, 09:48 PM
It is fall. My vote goes to rust fungus. Do you get an orange dust when you walk through it? Very common in fall on various cultivars of ryegrass, and a few types of bluegrass. The grass gets a very yellow color. Fertilizer helps. Rust disappears about the time of frost.

http://plantclinic.cornell.edu/FactSheets/turfrust/rust.htm