Grubex When To Apply, 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 and Armyworm infestations. Easily apply with a Scotts® broadcast, drop, handheld, or Wizz® spreader and stop grubs before they damage your lawn.,
GrubEx works as a preventative by preventing eggs from maturing and hatching, so you want to apply it late in the spring and be sure it is present in the soil through mid-summer. One application can last for about four months.
It is often best to put down grub preventers from April through mid-July when grubs are ready to hatch. If you want to stop grub damage right away, the best time to apply a grub killer to your lawn is when you first see signs of damage.02-Jul-2021
Because GrubEx targets the larval stage of many insects, the best time to apply it is when the beetles burrow into lawns to lay their eggs -- in spring to early summer. When the eggs hatch, GrubEx kills the emerging larvae so they cannot develop into mature insects.