Matthew from Shirley, Ny writes
If I've already killed off the grub population with a product like Dylox and then apply Milky Spore Powder, how long will it remain in the soil and be effective for when the next round of grubs appear?
It is most effective to apply Milky Spore Powder in the summer and early fall when grubs are active but it will sit in the soil until they begin to feed and then spread. The soil must be above 65 degrees F when the grubs are actively feeding, which is the best time for application. It works best to apply just before rainfall, or water in lightly after application to soak into soil. Once established in a lawn, Milky Spore has been known to last 15 to 20 years.
Answer last updated on: 09/09/2021
