It does work and it's an alternative to the pyrethrin test. Irritates the snot out of them and sends them to the surface. If you discover too many then you have a problem and will have to treat. I'd have to get into my QAC stuff to get more info but if you do an Internet search of "pyrethrin test" you'll come up with invaluable info including pictures of various damaged turfgrasses. It will also tell you which times of the year to test for different insects and how to treat.Jason Rose said:I also recall from Pesticide training class there is one brand of laundry detergent you can use mixed with water (borax or tide) and pour it over a 3'x3' area and within X minutes the grubs, or whatever worm it was, will come spilling to the surface, allowing you to count the population. Iv'e never tried it, but I know it's a method to use.