Hello Greenlawn customer my name is Ricky, your technician for todays service round 3. This application is to give your lawn season long protection from grubs. Grub is a white worm-like insect that damages your lawn during early fall season. Please be aware that in order for our application to be affective Grub Control needs to be watered in !!! Any questions don't hesitate to call the office. Thank you for choosing Greenlawn fertilizing !!!!