This makes it very difficult to identify; if correct diagnosis is critical contact a local cooperative extension program or a qualified commercial lab.

[3] Although it is difficult to identify alone, if one takes into account grass species and cultural practices a trained eye can diagnose summer patch.

[3] The "frog eye" appearance is often from the Poa annua being killed by the fungus while the middle living grass is Bentgrass.

[2] The fungus Magnaporthe poae is consistently found in grass roots but does not become noticeable until conditions are favorable.

Favorable conditions include extended periods of humid weather and daytime high temperatures usually (greater than 82 °F) in midsummer.

These practices should help promote adequate drainage, reduce soil compaction, and a balanced fertility program.

[3] If severe enough or on high valued turf (golf greens) summer patch can be controlled with the use of fungicides.