Arboriculture Glossary of Terms
- webbing sling (web sling)length of sewn webbing. often formed into a loop. used as an attachment in rigging.
- weightforce created by the action of the earth (gravity) on an object.
- wet feetRoots rep atedly or continually exposed to water-saturated soil conditions
- wetlandland where water saturation is the dominant factor determining the nature of soil development and the types of plant and animal communities living in and on the soil.
- white anta term often referring to termite.
- whoopie slingsling with one fixed eye and one adjustable eye. made from hollow-braid rope.
- whorledleaves. twigs. or branches arranged in a circle around a point on the stem (contrast with alternate and opposite). r
- wildlifeanimals living in a natural. undomesticated state.
- wilt1) n. loss of turgor and subsequent drooping of leaves and young stems; a symptom. 2) n. infectious disease caused by a particular agent on a particular host or range of hosts. 3) v. to lose turgor or to wilt.
- wilting pointsee permanent wilting point.
- WINwater-insoluble nitrogen
- windsailingeffect caused by the wind on a tree's crown.
- windthrowtree failure due to uprooting caused by wind.
- winter burnspecific to conifers and broadleaf evergreens. When soil freezes and moisture cannot be absorbed through the roots and/or transported through the trunk. the foliage dies and becomes brown or reddish brown.
- winter killinjury from cold winter temperatures.
- wire baskettype of metal basket used to support the root ball of a balled and bur lapped tree or a tree dug with a tree spade.
- wire ropea cable fabricated from individual wires twisted together in a uniform helical arrangement. Wire rope used in arboricultural applications typically contains 7 groups of 19 wires each. See aircraft cable.
- wire rope clampa clamp consisting of a U-bolt. bracing plate. and fastening nuts.
- wire stropflip line with a steel core.
- wire zonesection of a utility transmission right-of way directly under the wires. and extending to a utility specified distance (e.g.. 60% of phase spacing; 10 ft. or 3m) on each side. The wire zone is typically managed to sustain a low-growing forb. grass. herb. and shrub plant community.
- witches' broomProliferation of many shoots near the end of a branch in response to the death of the terminal bud
- witch's broomplant disorder characterized by a shortening of the internodes and a proliferation of terminal shoots forming a dense. brush-like mass of twigs.
- WLLworking-load limit
- woodhard. fibrous inner part of tree trunks. branches. and stems. The secondary xylem of seed plants.
- woodyPlant type that contains secondary xylem
- woody plantplant whose stem (and branches) have a wood-like consistency (e.g.. trees. shrubs. and vines as well as palms. bamboos. and other woody monocots ).
- work planpredetermined. orderly means for job completion.
- work-positioning harnessa body belt or full-body harness designed for hands-free work. and not intended to absorb large forces from falls. work-positioning lanyard. lanyard used in climbing. often as a secondary means of attachment. (see lanyard. safety lanyard. flipline. and buckstrap).
- work zonedefined area of a job site. marked with caution signs and/or cones. where potential hazards exist and safety measures are in place to avoid accidents.
- working endend part of a rope in use for rigging or climbing (contrast with running end and standing part).
- working loadload applied to a rope in normal service. working-load limit (WLL) tensile strength divided by design factor. Maximum load that should not be exceeded in a piece of equipment. rope. or rope assembly when performing its normal working function.
- wound dressingcompound applied to tree wounds or pruning cuts.
- xanthophyllyellow pigment found in plants.
- Xeriscapeuse of plant materials (usually native plants) and practices that minimizes water use. Term for environmentally friendly form of landscaping (see minimum irrigation).
- yarnsmallest component of rope. formed from twisted fibers of the component material(s). Contrast with strand.
- Z-rigZ-shaped. rope-and-pulley rigging system that achieves a 3 to 1 mechanical advantage.
- Z133American National Standard for Arboricultural Operations - Safety Requirements
- Zebrina pendulaZebrina pendula
- zeppelin bendknot used to join two lines.
- ziplinesimple type of speedline.
- ZTV-Baumpflegeacronym for Zusiilzlicbe Technische Vertragsbedingungen und Richtlinien fiir Baumpllege. 2006 (Additional Technical Contractual Terms and Guidelines for Tree Care). In Germany. guidelines or best practices and definition of technical tenus for various areas of tree care.