Arboriculture Glossary of Terms
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.
- Vernicia montanaWood-oil Tree -
- 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.
- Viburnum odoratissimumSweet Viburnum
- 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