The Terminology and Jargon of Tree Improvement

Adapted Family 
A family that originates from a simlar climatic and geographic region as the intended planting zone.
Control-Pollinated (CP) Family
Offspring produced by deliberately controlling the males and females during mating in conjunction with taking steps to block undesired pollen.
F-50
A term used to describe the estimated percentage of forking events that would be occur for a particular family assuming that unimproved trees on a given site would give 50% forking.
Family
The progeny (offspring) of a parent tree that has been established in a seed orchard
Fusiform Rust
Fusiform Rust (Cronartium quorum f. sp. fusiforme) is a pathogen that infects southern pines. In loblolly, the infection can result in a gall (swollen mass) on the stem or branch. This gall can impact the overall health of the tree causing weakening of the stem, death to the tree, or degrading the economic value of the tree.
Mass Control Pollinated (MCP) or Control Mass Pollinated (CMP)
The technique of creating a CP Family on an industrial scale. Commercially, use of the terms MCP or CMP may be for description or advertisement purposes depending on the company or organization.
Open-Pollinated (OP) Family
A family that is generated from a known female (a tree or set of trees in an orchard), but the male (pollen) is unknown. It could have come from another tree in the same orchard or from a wild stand nearby.
Provenance
A groups of trees from a geographic area
PRS
Performance Rating System  was developed by NCSU Cooperative Tree Improvement Program (NCSUCTIP) as a service to landowners, nursery managers, the tree improvement community, and loblolly pine breeders. PRS™ also stands for Productivity, Rust, and Straightness that are the three traits that are evaluated in all genetics trials. The PRS™ expresses the genetic potential of a family for stem volume production, resistance to fusiform rust disease, stem straightness.

R-50
A term used to describe the estimated percentage of fusiform rust incidence expected on a site for a family assuming that unimproved pine on the same site would result in 50% indicidence of fusiform rust.
Selection
A tree whose genetic value has been quantified by testing its progeny in a structured experiment.