I don't really get leaf spot that much but I have a spray if it gets bad. I pull off all brown leaves and the ones with leaf spot do not bother me that much. Sometimes the leaves are the only things that will have symptoms if you are having an iris problem so I don't trim them off. two years ago I had so many different grasshoppers eating every thing in site that the leaves on most plants, including irises, were chewed on. The ragged looking edges did bother me a bit. I thought about using something on them the next year if it was that bad but we went back to having normal hopper infestations.
