If you want to kill grubs, you need to decide between preventing them, and killing them. If you are finding grubs in the lawn actively feeding, then these products are what you want. On contact grub controls…
However, if you are looking for a grub worm killer that will prevent the little buggers from doing any damage, then you need a grub worm control insecticide that will last for the entire feeding season. Grubs typically threaten lawns beginning in later August. However, they are actually laid into the lawn in later June.
The best idea is to choose one of the products I recommend below and apply it in early June. These grub applications are designed to persist in the soil until the winter begins which is long enough to protect your lawn from grub damage. The key is to ensure you water in the treatment so it gets into the soil where the grass roots can take in the insecticide and be shielded from damage.
The products above containt Merit which is the industry standard insecticide used to prevent grubs from damaging lawns. Again, just make sure you water it in.
