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Arboriculture Glossary of Terms
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| Term | Definition |
|---|---|
| dead-end grips (tree grips) |
cable-termination devices that must be used to terminate extra-high-strength (EHS) tree support system cable to anchor hardware. May also be used with common-grade cable.
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| dead-end hardware |
lag-threaded cable anchor or bracing rod that is screwed directly into an undersized, pre-drilled hole in a tree but does not pass through to the other side. Contrast with through-hardware.
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| dead-eye sling |
rope sling with a single eye spliced in one end. Also called eye sling, fixed-eye sling, or spliced-eye sling.
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| deadwooding |
removing dead and dying branches from a tree. Outdated term for crown cleaning.
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| decay |
(1) (noun) an area of wood that is undergoing decomposition. (2) (verb) decomposition of organic tissues by fungi or bacteria.
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| deciduous |
tree or other plant that sheds all of its leaves according to a genetically scheduled cycle as impacted by climate factors (usually during the cold season in temperate zones). Contrast with evergreen.
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| decline |
gradually diminishing health or condition of a tree.
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| decline spiral |
see mortality spiral.
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| decurrent |
rounded or spreading growth habit of the tree crown. Contrast with excurrent.
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| deficiency |
pertaining to plant nutrition, lack or insufficient quantity of a required element.
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| defoliation |
loss of leaves from a tree or other plant by biological or mechanical means.
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| dehiscent |
splitting apart. Describes the release of seed capsules at maturity.
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| denitrification |
process of reducing nitrates to nitrogen gases.
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| dentate |
having serrations (teeth) perpendicular to the leaf margin and not pointed forward. Compare to serrate.
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| descender |
device used to control friction when descending a climbing line. Contrast with ascender.
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| desiccation |
severe drying out. Dehydration.
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| design criteria |
(1) aspects of the landscape or site and the required functions to be served by the plant that must be considered in plant selection. (2) factors considered in the design of equipment.
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| design factor |
factor by which the rated or minimum breaking strength of a rope or piece of equipment is divided in determining its working-load limit.
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| determinate growth |
development to a point characterized by a fixed number of leaves or other lateral organs. Contrast with indeterminate growth.
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| diagnosis |
process of identifying a disorder by analyzing signs, symptoms, site conditions, patterns, climate, cultural history, and other factors to determine the causative agent(s).
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