When should you apply grub control to lawns in the midtown Omaha NE area for 2021 season? I am assuming application will vary depending on the weather / temperatures per season. The grass type is tall fescue / bluegrass and some secluded areas of decades old zoysia. Any rules of thumb to keep in mind? I have purchased a granular Trichlorfon already so wanted to know if this is the right product and also how long it will it protect per application.