GrubEx is an insecticide from Scotts that controls grubs in lawns. The best time to apply GrubEx is after you see Japanese Beetles in your yard, or anytime between May and July.
Grubs are the larvae of Japanese Beetles. When they hatch, they begin eating the roots of your lawn. If left untreated, they can chew through huge sections of grass in a matter weeks, sometimes ruining an entire lawn in one season. Even if the damage is not extensive or even noticeable, if left untreated they will continue to infest your lawn and return the following year to do even more damage.
You can tell if you have grubs if you see brown patchy spots on your lawn. Those are sometimes mistaken for dry areas or pet damage. To tell the difference, try pulling the sod up. If the sod remains attached to the soil, it's probably not grubs. However, if the sod comes up relatively easily, then you have grubs. Normally, when you pull up the sod, you'll see them curled up on the dirt in a white half-moon shape. They are likely in a variety of other places in your lawn. Since it takes a while for sod to turn brown, even green grass can have a grub infestation.
They only way to get rid of them is with insecticides such as GrubEx. Apply it according to the directions given on the bag. Then, water deeply enough so that it reaches the roots where the grubs are living. Don't overwater. You don't want to wash away the insecticide. Don't water too little either.
Grubs are a serious problem for lawns in all regions. If you or a neighbor has ever had problems with grubs, it's a good idea to put down GrubEx as a precaution. GrubEx will also kill sod webworms, armyworms, cutworms and crane fly larvae. One application will work for an entire growing season.