White grubs, a general name. Ascerno. Figure 1. Grub. Identification: White grubs is a general name for the grub (larval) stage of beetles in the family Scarabaeidae, order Coleoptera (beetles) that feed on the roots of turf (Figure 1) .amage, scouting, and management: Larvae feed on the roots of turf grasses and adults feed on roses, phlox, and petunias, although they are active at night and more cryptic compared to Japanese beetle. A good pheromone trap is available.
Parent material is the underlying geological material (generally bedrock or a superficial or drift deposit) in which soil horizons form.cean deposited parent materials, called marine sediments, are collections of material that have been carried by rivers and streams to the ocean and eventually sink to the bottom.
Soil Formation 7Many parent materials are residual and formed in place from some kind of bedrock, like limestone, shale, or sandstone. This material is called residuum (rehÂ­zijÂ­you-um). The kind of bedrock influences the texture of the soil.he characteristics of the soil are determined by the type of parent material, the organisms (plant and animal life on and in the soil), the climate under which the soilÂ­forming factors were (and are presently) active, the topography, and the length of time that the forces of soil formation have been active.