For several weeks there have been a couple of small black spots on some greens. It wasn't until we actually started poking around, that we discovered the unusual cause.
While removing the turf covers last March, we apparently missed a few of the staples used to hold them in place over the winter.
Iron is often applied to the greens to give them a nice color (without stimulating growth), however it is well known that too much iron can temporarily turn the turf black. It looks like the rusty staple was overdosing this small area--mystery solved.
Fortunately none of our greensmowers ever had a run-in with this piece of metal throughout the growing season.
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