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Arboriculture Glossary of Terms
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| Term | Definition |
|---|---|
| pin lock |
see notch gate.
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| pinnate |
type of compound leaf, with leaflets along each side of a common axis. Contrast with bipinnate and palmate.
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| plant growth regulator |
compound effective in small quantities that affects the growth and/or development of plants. May be naturally produced (hormone) or synthetic. See plant hormone.
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| Plant Health Care (PHC) |
comprehensive program to manage the health, structure, and appearance of plants in the landscape.
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| plant hormone |
substance produced by a plant that, in low concentrations, affects physiological processes such as growth and development, often at a distance from the substance point of origin. See plant growth regulator.
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| planting specifications |
detailed plans and statements of particular procedures, requirements, and standards for planting.
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| plasmodesmata |
junctions through cell walls that connect the cytoplasm of adjacent plant cells, forming a circulatory and communication system connecting the cells in plant tissue.
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| pleaching |
specialty technique of pruning and training branches or vines in which they are interwoven, often to form an arbor, wall, or arching tunnel.
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| plunge cut |
using the tip of a chain saw to cut into or through the middle of a piece of wood. Back-cut technique in which the hinge is established by cutting through the stem behind the notch then cutting back away from the hinge. Bore cut.
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| pole pruner |
long-handled tool used to make scissorslike, small pruning cuts that cannot be reached with hand tools.
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| pole saw |
long-handled tool with a pruning saw on the end.
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| pollarding |
specialty pruning technique in which a tree with a large-maturing form is kept relatively short. Starting on a young tree, internodal cuts are made at a chosen height, resulting in the development of callus knobs at the cut height. Requires regular (usually annual) removal of the sprouts arising from the cuts.
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| Port-a-Wrap III |
brand name for the third generation of a device used to create and manage friction in the lowering line (load line) in rigging operations.
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| positive-locking |
(obsolete) in reference to carabiners and snaps, locking automatically and requiring two or more motions to prepare the gate to open. Prevents unintentional opening.
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| pot bound |
see root bound.
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| potential energy |
stored energy that an object has due to its position in relation to a fixed, horizontal plane.
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| powdery mildew |
any of various fungi of the genus Erysiphe producing powdery conidia that appear as a white, fuzzy coating on the upper leaf surfaces, often causing distortion of the leaf.
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| power |
rate of work done per unit of time.
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| PPE |
personal safety gear such as hard hat, safety glasses, hearing protection, and leg protection, including chaps.
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| Preformed Tree Grip |
brand of dead-end grip.
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