Both granular and liquid control products are used throughout the season depending upon the particular pest.
Preventative Insect Controls:
Chinch bugs, sod webworms and grubs just love to feed on your lawn. While there are other potential damaging insects, these seem to be the three most common insects that we deal with in this area. Left unchecked, they can pose major problems.
Controls are applied for these insects during the late spring and summer months as a preventative measure. One application to control grubs will give season long protection under normal conditions. Surface insect controls, for the most part, can provide season long control, but is not guaranteed. Thatch layers over 3/4″ may not allow the material to move to the desired location to control either of these pests.
Majority of insect damage shows up during the summer stress periods and can appear to look like a dry area or “Hot” spots. Unfortunately, by the time you realize that it is insect damage, you are most likely looking at a large expense in repairing your lawn.
It is my opinion that you prevent a potential problem from occurring, rather than running the risk, and the added expense of having to repair a damaged lawn.