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- LTOALondon Tree Officers Association
- LVlow voltage
m
- Machard tresse (Mt)type of friction hitch used in climbing and rigging.
- machine-threadeda fine-thread pattern on hardware. used with a nut and washer and installed through a pre-drilled hole that is larger in diameter than the hardware being installed (contrast with lag-threaded).
- macroinfusiontechnique to introduce substances directly into the xylem of a tree to treat or prevent diseases. disorders. or pest problems through a relatively large-diameter hole in the trunk or a cut root (contrast with implant. macroinjection. and microinjection).
- macroinjectiontrunk injection technique that requires a relatively large-diameter hole in the trunk (contrast with implant. macroinfusion. and microinjection).
- macronutrientessential element that is required by plants in relatively large quantities such as nitrogen (N). phosphorus (P). potassium (K). and sulfur (S) (contrast with micronutrient).
- macroporerelatively large space between soil particles that is usually air filled and allows for water movement and root penetration (contrast with micropore).
- main conductorprimary conductor cable of a tree lightning protection system. Standard down conductor.
- manila roperope made of natural fibers. Manila hemp.
- marginalReferring to the edge or border of a leaf. as in marginal burning; also. the lower limit of acceptable conditions. as in marginal soil
- marline hitch1) simple hitch used in lashing. 2) in rigging. a secondary knot used in combination with a primary attachment knot to tie off sections for lowering.
- marline spiketool that tapers to a point. Used for separating the strands of a rope in splicing and in marling.
- marlingact of forming mar line hitches in series along an object.
- mass gradingprocess of reshaping the landscape to specified elevations for the construction of buildings and/or to provide drainage (see grading).
- mature heightmaximum height that a plant is likely to reach if the conditions of the planting site are favorable.
- MCIPMember of the Canadian Institute of Planners
- mealybugsmall. sap-sucking. scale-like insect coated with a white powdery wax.
- mechanical advantagesystem by which effort or force can be multiplied.
- meristemundifferentiated tissue in which active cell division takes place. Found in the root tips. buds. cambium. cork cambium. and latent buds.
- mesophyllmiddle layers of a leaf where most photosynthesis takes place. Layers of the leaf between the upper and lower epidermis.
- metamorphosisbiological transformation in the life cycle of an organism. going from an immature to an adult stage.
- MEWPmobile elevated work platform
- Michoacantype of friction hitch used in climbing and rigging. named for a region in Mexico.
- micro drill resistance testinguse of a small diameter drill bit on an electric drill. measuring the change of torque resistance and indicating wood density as the drill bit passes through a trunk or limb. In tree risk assessment. used to measure the extent of decay.
- microbial extractssubstances derived from microorganisms. May be used to control certain pests.
- microenvironmenta small area with physical and ecological characteristics that distinguish it from its immediate surrounding area.
- microinjectiontrunk injection technique using a small-diameter trunk penetration to introduce chemicals directly into the xylem (contrast with implant. macroinfusion. and macroinjection).
- micronutrientessential element that is required by plants in relatively small quantities such as iron (Fe). manganese (Mn). zinc (Zn). copper (Cu). and boron (B) (contrast with macronutrient).
- microporespace between soil particles that is relatively small and likely to be water filled (contrast with macropore).
- micTopulleysmall. light-duty pulley used in climbing op rations. Often used as a knot lender.
- midline looplooped knot formed or tied in the standing part of a line.
- mineralnaturally occurring. inorganic solid that has a definite chemical composition and possesses characteristic physical properties. Certain minerals are considered essential elements for tree growth and development.
- mineralizationprocess in which an organic substance is converted to or trapped in an inorganic substance.
- minimum irrigationpractice of minimizing irrigation needs through the use of drought-tolerant plants and watering only when necessary (se Xeriscape).
- minimum vegetation clearance distance (MVCD)a calculated minimum distance stated in feet (or meters) to prevent spark-over for various altitudes and operating voltages. that is used in the design of transmission facilities.
- type of cut used in branch removal in which offset. overlapping cuts enable the section to be easily broken off. Bypass cut (see snap cut).
- mitessmall. often minute. arthropods in the order Acarina of the class Arachnida that may feed on plants. other mites. or small insects.
- miticideschemical compounds that are toxic to mites.
- mitigateto make less severe.
- MLOmycoplasma-like organism
- mobileCapable of being moved
- Mobile Community Inventory Tool (MCTI)tree inventory software program included in i-Tree.
- mobile elevating work platform (MEWP)general term used primarily in the United Kingdom for mobile aerial platforms that are widely used on work sites in place of ladders and tower scaffolds.
- moleculeone or more atoms. The smallest amount of a substance that keeps its chemical properties.
- moltin insects and other arthropods. part of the metamorphosis process in which old skin is shed after a new skin (or cuticle) is formed.
- momenta turning. bending. or twisting force exerted by a lever. defined as the force (acting perpendicular to the lever) multiplied by the length of the lever.
- monitoringkeeping a close watch. Performing regular checks or inspections.
- monocotsee monocotyledon.
- monocotyledonplant with an embryo that has one single seed leaf cotyledon). Examples are grasses and palms (contrast with dicotyledon .