Q: If we had a lot of grubs before, would it hurt to put down milky spore and/or nematodes?
A: Milky spore works best with two applications one week apart. Over time you should have fewer grubs due to the deep roots and dryier soil that constitutes Pearl’s Premium grass. Also, grubs need constantly moist soil. They move away when you stop watering after one month, and the 12-inch roots are able to withstand some grub damage. Typically, 1 to 4 grubs per square foot will not cause problems; but more than about 8 to 12 per square foot will need treatment by milky spore or nematodes.