Repellent herbal flea collars like those sold by Pet Organics, Gardens Alive, and Harmony. Silica aerogel dusts like Drione for the yard. White Grubs White grubs or grubworms are the larval stage of May or June beetles and Japanese beetles. Their distinctive C-shaped, white or gray bodies with brown heads tunnel around in your garden soil munching on grass and plant roots. Female beetles can lay up to 60 eggs in their short, 6-week lifetime.
Severe infestations can cause serious damage to turfgrass, shrub foliage and ornamental blossoms.
By most expert definitions, this means more than six to ten grubs per cubic foot of soil. Less than that will have little impact on your lawn or garden. The best controls against the adult forms of these beetles include Pheromone traps like SureFire and Safer Japanese Beetle Trap. Physical controls like row covers sold by Gardens Alive, Peaceful Valley, and Harmony. Sticky traps and tape like Chroma, Ecogen and Sterling's Japanese Beetle Trap.