Scotts® GrubEX Season Long Grub Killer 5,000sq ft Coverage Prevent grubs from damaging lawns with Scotts® GrubEX 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. Easily apply GrubEX with a Scotts® broadcast, drop, handheld, or Wizz spreader. Active ingredient: Chlorantraniliprole 0.08%. Other ingredients: 99.92%.