I didn't realize grubex is using a new chemical that appears to be relatively safe and effective.
Chlorantraniliprole (AceleprynTM for commercial applicators, GrubExTM for homeowners) is a non-neonicotinoid insecticide that is extremely effective against all white grub species (as well as caterpillars) and has no activity against bees, ants, or wasps. The product also has a very low level of vertebrate toxicity, so much so that a signal word is not required on the label, not even ‘Caution’. An important aspect of using chlorantraniliprole is to account for the fact that it takes 60 to 90 days to fully dissipate in the soil for optimum effectiveness against grubs. Therefore, the preventive window is earlier than for the neonicotinoids, usually mid-April to early June in most years.