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.
parent material which is the weathered rock or unconsolidated mass from which the soil forms determines the chemical and mineralogical composition of the soil soils of the ventura area formed in material weathered from sandstone shale and basic igneous rock and in alluvium derived from mixed rock sourceshe hambright soil is an example of a soil that has a minimum of translocated clay in contrast the huerhuero soil an example of a soil that has maximum clay translocation the reduction of iron a process called gleying results in mottled or olive and gray colors