Prevent grubs from damaging your lawn with Scotts GrubEx 1 Season Long Grub Killer. A single application can stop and prevent grubs all season long. Apply during spring or early summer to kill grubs as they develop. Using Scotts GrubEx 1 Season Long Grub Killer annually can also help control Japanese beetle infestations as well as armyworms. Easily apply with a Scotts broadcast, drop, handheld, or Wizz spreader and stop grubs before they damage your lawn.