It seems to affect the bees ability to navigate , if they do not return
home then there is no next generation.
Of course the producers will probaly deny this but the beekeepers
believe otherwise and also have a stake in it.
If you will notice the original poster referred to beetles all over her
garden.
As for turfgrass application, if there are no clovers or no flowering
weeds like dandylions or no nectar producing trees which includes
maples, sure it would be hard to get into nectar.