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.
the type of parent material and how the soil is formed will greatly influence the properties of the soil there are two general rules that we may state about the influence of parent material on soil formation finely textured parent materials tend to weather into finely textured soilshe parent material may be mineral rock and or organic matter when parent rock material is exposed to the atmosphere or when organic matter and or minerals are deposited on the earth s surface soil formation begins