drug treatment for lawns
We need more information to best help you.
First off, what makes you think you have a grub problem? Many people think they do without really knowing,while the problems they are having can be attributed to something else.
Treatment should not be done unless you are sure you have a problem with grubs.
Grubs do not seriously affect lawns of turf type tall fescue, which is the most common and recommended type of grass to be grown in our area.
If you were to dig in a one square foot area and had more than about 10 grubs, then you might treat.
A relatively new insecticide choice that is safe to apply and provides excellent control is Acelepryn (Chlorantraniliprole) which is found in GrubEx (active ingredients can change periodically so check the product label). In addition to excellent white grub control, surface feeding insects such as sod webworms and cutworms are also controlled. This insecticide has low toxicity to vertebrates and has shown no adverse effects on beneficial insects. Acelepryn has a broad application window (May – September).
We are not sure what insecticide you have there. You would need to let us know the name and (in the small print), the "Active ingredients" listed.