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u
- Uniform Fire Codein the United States. regulations that address and specify fire prevention standards and measures. Affects utility arboriculture because it defines minimum clearance distances to be maintained between vegetation and electrical conductors. Also addresses issues pertaining to flammable liquids.(...)
- urban forest management plandocument that describes how urban forestry goals are to be accomplished within a defined time frame; includes tasks. priorities. best management practices. standards. specifications. budgets. and staffing analyses.
- urban foresteran individual trained in or practicing ' urban forestry. "
- urban forestrymanagement of naturally occurring and planted trees and associated plants in urban areas.
- urban heat islandphenomenon of cities having air temperatures warmer than adjacent rural areas and producing more smog.
- Urban-Wildland Interface Codefire prevention standards and regulations developed by the International Fire Code Institute that define the difference between urban areas and wildlands. In utility arboriculture. defines minimum clearance distances around electrical lines. Also addresses proper planning. construction(...)
- USDAUnited States Department of Agriculture
- USGBCU.S. Green Building Council
- USTunderground storage tank
- utility1) a public or private entity that provides products or services. including communications. electricity. natural gas. transportation. and water. 2) the facilities associated with any particular utility. 3) an economic concept considered in the appraisal of monetary value; the ability to(...)
- utility arboriculturesector of the arboriculture industry that provides services to utilities that often requires specialized equipment and training of workers. Includes utility line-clearance pruning right of-way clearing and maintenance. and Integrated Vegetation Management.
- utility line clearance pruningselective removal of vegetation. especially tree branches. that could affect electric supply lines or other utility facilities.
- utility line-clearance pruningselective removal of vegetation. especially tree branches. that could affect electric supply lines or other utility facilities.
- utility pruningpruning around or near utility facilities with the object of maintaining safe and reliable utility service.
- utility vegetation managera professional with the proper experience. education. and training to successfully establish or supervise an integrated vegetation management program.
- UVMutility vegetation management
- UWICUrban-Wildland Interface Code
v
- Valdotainvariation of the French Prusik. Used as a friction hitch in climbing and rigging.
- Valdotain tresse (Vt)variation of the French Prusik. Used as a friction hitch in climbing and rigging.
- VAMvascular arbuscular mycorrhizae var. variety
- vandalismdeliberate damage or destruction of property.
- varietynaturally occurring subdivision of a species having a distinct difference and breeding true to that difference (compare to cultivar).
- vascular discolorationdarkening of the vascular tissues of woody plants in response to disease.
- vascular plantplant with xylem and phloem elements for conducting water. nutrients. and photosynthates.
- vascular systemphloem and xylem. the parts of a tree which conduct water and minerals. or organic compounds.
- vascular tissuetissue that conducts water or nutrients.
- vascular wiltwilting of a tree caused by diseases of the vascular system.
- vector1) in pathology. biotic or abiotic agent that transmits a pathogen. 2) in mechanics or rigging. quantity that has both a magnitude and a direction (e.g.. force) (see acceleration and velocity).
- vegetation managementmanagement and control of vegetation to achieve established goals and objectives (see Integrated Vegetation Management).
- vein clearingSymptom of virus-infected leaves in which veinal tissue is lighter green that that in normal plants
- velocitysimply. speed. Rate at which an object's position changes in a specific direction over time. A vector quantity. See acceleration and vector.
- venationarrangement of veins in a leaf.
- vertical mulchingan aeration or fertilization technique. f Drilling vertical holes in the soil and filling them with materials to improve aeration.
- vesselsnon-living end-to-end. tube-like. water conducting cells in the xylem of angiosperms.
- vigor(vigour) capacity to grow and resist stress. Sometimes limited in reference to genetic capacity.
- virusultramicroscopic. infectious agent (piece of [ nucleic acid) that can reproduce only in living cells of other organisms. Can cause disease.
- vista pruningselective pruning to enable a view from a predetermined point.
- visual tree assessment(VTA) method of assessing the structural integrity of trees using external symptoms of mechanical stress (such as bulges. reactive growth. etc.) and defects (cracks. cavities. etc.).
- vitalityoverall health. Ability of a plant to deal effectively with stress.
- VMvegetation management
- volatilizationconversion of a solid or liquid into a gas or vapor.
- volt (V)measure of electric potential or electromotive force. A potential of one volt appears across a resistance of one ohm when a current of one ampere flows through that resistance.
- voltagedifference in electrical potential between any two conductors or between a conductor and ground. A measure of the electric energy per electron that electrons can acquire and/or give up as they move between the two conductors.
- voltage regulator1) pertaining to electric utilities. device used to maintain the voltage within the electrical conductors at a constant level and within the defined tolerances. 2) device in the electrical system of a vehicle or equipment engine.
- VtValdotain tresse
- VTA(Visual Tree Assessment) method of assessing the structural integrity of trees using external symptoms of mechanical stress (such as bulges. reactive growth. etc.) and defects (cracks. cavities. etc.).
- VWFvibration white finger
w
- water budgeta calculation. based on precipitation and environmental factors. that establishes the minimum irrigation needed to maintain plant health.
- ability of a soil to hold moisture.
- water-insoluble nitrogen (WIN)nitrogen fertilizer in a form that is not readily soluble in water.