Don’t panic – the chances are that the product was not applied very evenly so that some areas got too high a dose. If you can still see granules sitting on the grass, try to spread them more evenly using a stiff broom, then water the lawn thoroughly. This will help wash the granules down into the soil. Leave the lawn for a further week then rake out any dead moss and grass.  Leave for a further two weeks before re-seeding any bare patches with lawn seed.