I think everybodies been there. I had the opportunity two years ago. I was apply the second to last round and mistakenly forgot to open the third hole after the perimeter on my lesco push spreader. When I came back in early November for their last round I was suprised to see a very streaked lawn. My first thought was sure hope we get a good snow covering this winter. What I ended up doing was spraying a chelated iron formula to the lawn, within two weeks the streeks were gone and only lush green remained into the spring. I have used liquid iron applications during the growing season and had huge results in less then 24 hours. One PRECAUTION do NOT apply when lawn is frozen or when a frost is expected within the time iron is on leaf surface, it will turn your green striped lawn into a black lawn!!