Asked April 4, 2019, 1:53 PM EDT

If, today, I dig out a dollop of soil 4 inches deep and find no grubs in it, is it safe to assume I have no grubs? Or might they be deeper than that, so can't be detected?

Ottawa County Michigan

1 Response

Grubs overwinter just below the frozen soil and quickly return to the grass roots to feed once the ground has thawed. Checking a square foot of turf at the root level is usually adequate to see if have a problem. Low-maintenance turf will tolerate five to 10 grubs per square foot. Irrigated and high -maintenance turf can handle more. The following links should be useful:

I hope this helps,