Paul keeps on telling me not to use GrubEx to control Japanese Beetles, but to use Milky Spore instead. Apparently, he has been hit by the Japanese Beetle onslaught this year along with the rest of us.
Paul likes the idea of using Milky Spore because it isn’t an insecticide. It is a naturally occurring host specific bacterium (Bacillus popillae-Dutky). It is harmless to anything other than Japanese Beetle Grubs. This is good if you like to walk on your lawn or have pets and kids. It does need to be watered in, just like an insecticide thought.
The way you apply Milky Spore is different than you would apply an insecticide. Instead of spreading it with a lawn spreader, you pile it in small spots in a grid like pattern on your lawn. Over time, the milky spore is eaten by newly laid white grubs and they become infected by the bacterium. It takes a few years for the milky spore to completely kick in, but the stuff lasts for 15-20 years. That’s pretty damn good.
If this GrubEx that I already put down in the beginning of July doesn’t take care of the grub problem, I will put down milky spore next Autumn. That’s when grubs are at their hungriest and they are the most likely to eat the milky spore.