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Arboriculture Glossary of Terms
There are 1070 entries in this glossary.
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| Term | Definition |
|---|---|
| lateral root |
root that arises by cell division in the pericycle of the parent root and then penetrates the cortex and epidermis.
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| latewood |
portion of an annual ring (growth ring) that forms during summer, characterized by small-diameter cells with thick walls. Summer wood. Contrast with earlywood.
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| leach (leaching) |
(1) tendency for elements or compounds to wash down through the soil. (2) tendency for elements or compounds to wash into the soil. For example, alkaline compounds may leach from concrete, or heavy metals may leach from aggregates, and both may damage plants.
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| lead |
part of a rigging line, from the rigging point to the load. Contrast with fall.
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| leader |
primary terminal shoot or trunk of a tree. Large, usually upright stem. A stem that dominates a portion of the crown by suppressing lateral branches.
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| leaf |
primary, photosynthetic organ of a plant that is connected to a stem by a petiole.
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| leaf apex |
tip of the leaf blade.
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| leaf base |
bottom part of the leaf blade.
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| leaf blotch |
irregularly shaped areas of disease on plant foliage.
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| leaf margin |
outer edge of the leaf blade.
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| leaf scar |
scar left on the twig after a leaf is shed.
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| leaf spot |
patches of disease or other damage on plant foliage.
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| leaflet |
separate part of a compound leaf blade.
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| leg protection |
type of PPE. Any clothing or device to protect the legs from various injuries. Chaps or other chain saw
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| lenticel |
small opening in the bark that permits the exchange of gases.
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| lesion |
local area of diseased or damaged tissue.
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| liability |
something for which one is responsible. Legal responsibility.
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| lifting |
(1) in pruning, (crown) raising. (2) in rigging, technique in which the tip of a branch is raised up before lowering in order to avoid obstacles below.
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| lifting cut |
variation of the hinge-cut technique used to cut limbs that are being lifted.
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| lignification |
process in which cell walls become thicker and stronger by impregnation with lignin.
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