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Categories All categories Arboriculture Terms
c
- CPOcontinuing professional development
- CPRcardiopulmonary resuscitation
- cracksseparation in wood fibers; narrow breaks or fissures in stems or branches. If severe. may result in tree or branch failure.
- crenateterm to describe a leaf margin with rounded teeth.
- critical root zone(CRZ) area of soil around a tree where the majority of the roots are located and that provide stability as well as uptake of water and minerals. CRZ determination is sometimes based on the drip line or a multiple of dbh. but because root growth is often asymmetric due to site conditions.(...)
- critical root zone (CRZ)area of soil around a tree where the minimum amount of roots considered critical to the structural stability or health of the tree are located. CRZ determination is sometimes based on the drip line or a multiple of dbh. but because root growth can be asymmetric due to site conditions. on-site(...)
- crookabrupt bend in a branch or trunk.
- cross sectionsection perpendicular to the axis of longitudinal growth.
- crotch1) n. branch union or fork. 2) v. to place a line through a branch union.
- CROWCountryside Rights of Way Act
- crownupper part of a tree. measured from the lowest branch. including all the branches and foliage (see canopy).
- crown cleaningin pruning. the selective removal of dead. dying. diseased. and broken branches from the tree crown.
- crown hierarchyamount of apical dominance within a tree crown leading to tree crowns of monoconnic (excurrent. one leader) oligocormic (decurrent with a small number of leaders) or polyconnic (decurrent with a larger number of more or less equal leaders) organization.
- crown raisingin pruning. the selective removal of lower branches or limbs from a tree crown to provide clearance (see raising and lifting).
- crown reductionmethod of reducing the height and/ or spread of a tree crown by making selective pruning cuts from the outer branches. Reduction.
- crown restorationmethod of restoring the natural growth habit of a tree that has been topped or damaged in any other way. Restoration pruning.
- crown rotdisease or decay at the base of a tree or root crown (see butt rot).
- crown thinningin pruning. the selective removal of live branches or limbs to reduce crown density.
- CRZcritical root zone
- CSACanadian Standards Association
- CSLACanadian Society of Landscape Architects
- CTFCanadian Tree Fund
- CTLACouncil of Tree and Landscape Appraisers
- CTSPTCIA Certified Treecare Safety Professional
- cultivarcultivated variety of a plant that cannot be reproduced without human assistance. Usually propagated asexually (cloned) (compare to variety).
- cultural control1) method of controlling plant pests by providing a growing environment favorable to the host plant and/or unfavorable to the pest (see Plant Health Care and Integrated Pest Management). 2) management of vegetation through alternative use of the right-of-way that precludes growth of(...)
- cultural problemstoo little or too much sunlight. water. fertilizer. air. pests. or other factors resulting in poor health or growth.
- current (electric)flow of electrons in an electrical conductor. The strength or rate of movement of the electricity is measured in amperes.
- current surgesin an electric utility system. a momentary. excessive increase in the amount of electricity flowing through a wire or other conductor.
- cut-surface applicationmethod of placing herbicide on stumps immediately after cutting so that the herbicide is absorbed and translocated to the roots. Often used in utility arboriculture.
- cuticlewaxy layer outside the epidermis of a leaf that retards water loss and helps protect the leaf from insects and diseases.
- cv.cultivar
- cycle1) see pruning cycle. 2) see cycles to failure.
- cycle bustersin utility and municipal arboriculture. fast-growing trees that need to be pruned more frequently than the set pruning cycle (see pruning cycle).
- cycles to failurenumber of times a rope or other piece of equipment can be used with a given load before mechanical failure.
- cytokininsplant hormones involved in cell division. leaf expansion. and other physiological processes. Compounds with cytokinin-like activity may be synthetically produced.
d
- D-ringsD-shaped metal rings on a climber's saddle for attaching ropes and snaps.
- DAFBdiameter above flare or buttress
- dBdecibel
- dbhacronym for tree diameter at breast height. Measured at 1.4 m ( 4.5 feet) above ground in the United States. Australia (arboriculture). New Zealand. and when using the Guide for Plant Appraisal (9th ed.); at 1.3 m ( 4.3 feet) above ground in Australia (forestry). Canada. the European Union.(...)
- DdRTacronym for doubled rope technique. Dynamic or static climbing system in which a rope is doubled over a branch and the climber uses both parts of the line (contrast with DRT and SRT).
- dead-end bracea brace formed by threading a lag-threaded screw rod directly into a limb. leader. or trunk but not through the side opposite the installation.
- dead-end gripsa manufactured wire wrap designed to form a termination in the end of a 1 x 7 left-hand lay cable.
- dead-end hardwareanchors or braces that are threaded directly into the tree but not through the side opposite the installation. Dead-end hardware includes but is not limited to lag hooks. lag eyes. and lag-threaded screw rods.
- dead-eye slingrope sling with a single eye spliced in one end. Also called eye sling. fixed-eye sling. or spliced-eye sling.
- deadwoodingremoving dead and dying branches from a tree. Outdated term for crown cleaning. which is more comprehensive.
- deciduoustree or other plant that sheds all of its foliage annually (contrast with evergreen).
- declineI) gradually diminishing health or condition of a tree. 2) a pattern of decline conditions in a particular species not necessarily associated with a single cause. e.g.. ash decline.
- decline spiralinteraction of causal agents that accelerates decline (see mortality spiral).
- decurrentrounded or spreading growth habit of the tree crown (contrast with excurrent).