I've spot sprayed twice with Ortho Weed B Gone. The first time nothing happened so I sprayed again about a week later. Now I have spots in the yard where the grass is dead but not the dandelions! They are wilted, but not dead, and are even now spreading their evil spawn all over my yard. I mixed about 4 oz. per gallon, IIRC, and the temperatures were in the range of upper 50's to lower 60's. I'm in central Missouri and have a fescue and bluegrass lawn. I would say it appears as though the bluegrass was affected to a higher degree than the fescue. What can I do to get rid of these evil weeds from hell? BTY, my kids love these "pretty little yellow flowers", maybe they are somehow sabotaging my efforts?