Answer: Dursban kills insects, cranefly larvae and cutworms in turfgrass areas so the application should have taken care of most of the pests. Adult cranefly's lay eggs in the soil under turf so when the eggs hatch the pupa (or leatherjackets) will have a source of food. If you see flying insects this time of year, that's probably what they are. The dark green areas around the edges of the lawn sound more like a cultural problem than an insect problem - perhaps caused by the leaching of fertilizer from adjacent flower beds?
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