I have managed 3 acres of mostly non-irrigated lawns at my workplace for over 20 years. Three years ago we had our first ever devastating grub attack that took out about 1/4 of the area. I imagine the conditions were just right for the population explosion. I've brought the lawns back and have been applying Merit for the past three years with success. When, if ever, can I stop these applications? How can I develop my crystal ball to determine the risk of grub infestation again? Does it make sense to apply every other year to keep the populations under control? Or, have you guys experienced population explosions with no good indicators. If adequate moisture continues this summer, it might be a good year to try going without it. Any opinions are appreciated. Thank you.