Grubs, What Spring ground temperatures do they become active..
What temperatures and soil depths do Grubs become active and start feeding, so i can put down Granular trichlorfon 9.3% and then put down grass seed
Wayne County Michigan
Here is a fact sheet on Japanese beetles which discusses the lifecycle and treatment windows. It gives treatment windows by month not soil temperatures.
The MSU Turf grass Team maintains GDD tracker to predict turf pest and pesticide applications.http://gddtracker.net/?model=11&offset=0