Plantsmylove said: Well I brought some milky spore it was very $$ and applyed it to the lawn.
This is a bit late, sorry, but last year I attended a seminar at which one of the topics was white grub control (there are several species of white grubs that attack turf, and Japanese beetle grubs are just one of them, and the only one affected by milky spore).
It was stated by the entomologist that milky spore appears no longer to be effective against Japanese beetle grubs, at least in some areas, and that the nematode Heterorhabditis bacteriophora was recommended where use of conventional pesticides was not desired.
Since you're in Minnesota I checked the University of Minnesota Extension pages for Japanese beetle info and they seem to concur as their article says:
"In trials in Ohio milky spore disease (Bacillus popillae) has not been as successful in killing JB grubs as was reported in the 1960's. A beneficial nematode, Heterorhabditis bacteriophora, attacks JB grubs............ Nematodes need to be applied to soil at night and the soil must be irrigated daily to keep it moist so the nematodes stay alive."
This is quoted from Japanese Beetle Management in Minnesota:
http://www.extension.umn.edu/g...
Of course any treatment of your lawn presumes there are, or will be, JB grubs there and that the adults you have aren't instead/also flying in from elsewhere in the neighbourhood.
