The best grub killer for lawns combines fast action with long-term protection. Organic formulations containing beneficial fungi like Metarhizium spp. offer effective control by targeting grubs in their larval stage. These treatments penetrate the soil, reducing grub populations while being safe for pets and beneficial insects. For best results, apply grub killers during early summer or fall when grubs are most active. A quality grub killer will enhance lawn health and prevent future infestations.