Licensed tree care expert (LTE) -- a person skilled in the science of tree care that engages in the business or work of the treatment, care, or removal of trees for compensation by making diagnoses, prescribing and supervising, treatments or trimming, pruning, cable and removing trees. In Maryland, anyone working on trees for compensation must be an LTE certified by the State Department of Natural Resources. An LTE differs from a certified arborist. Mycorrhizae – healthy fungi that enhances uptake of water and nutrients for a tree. Mycorrhizae usually appear in soil as a fine, white substance in healthy soil. Native species -- a tree or plant that is living, growing, and reproducing naturally in a particular region and adaptable to climate and soil conditions in a specific area. Plants that are endemic (indigenous) to a region within the modern era. Naturally occurring and not introduced by humans, in contrast to exotic species, introduced species and naturalized species. Necrosis -- dead tissue on a tree. Nitrogen fertilizer -- chemical compound in which the percentage of nitrogen is greater that the percentage of any other nutrient in the compound, or when applied, results in an average application rate of more than twenty (20) pounds of nitrogen per acre over the field to which it is being applied. Non-attainment zone -- an area considered to have air quality worse than the National Ambient Air Quality Standards as defined in the Clean Air Act Amendments of 1970 (P.L. 91-604, Sec. 109). No net loss -- a goal to primarily keep the current acreage of forest in Maryland and Montgomery County. Tracking a No Net Loss goal requires setting a baseline, identifying an appropriate scale of resolution, and establishing a consistent, accurate, and timely data source for forest acreage. For statewide coverage, remote sensing is the most cost-effective type of option. Pesticide -- any substance or mixture of substances intended for preventing, destroying, repelling, or mitigating any pest, (2) any substance or mixture of substances intended for use as a plant regulator, defoliant, or desiccant, and (3) any nitrogen stabilizer, except that the term "pesticide" shall not include any article that is a "new animal drug" within the meaning of section 321(w) 1 of title 21, that has been determined by the Secretary of Health and Human Services not to be a new animal drug by a regulation establishing conditions of use for the article, or that is an animal feed within the meaning of section 321(x) 1 of title 21 bearing or containing a new animal drug. The term "pesticide" does not include liquid chemical sterilant products (including any sterilant or subordinate disinfectant claims on such products) for use on a critical or semi-critical device, as defined in section 321 of title 21. (USEPA) Phloem -- the inner bark of a tree that is a transport tissue. Phloem moves energy-containing sugars produced in leaves through the tree for storage and consumption. Plant hardiness zone – the USDA standard by which gardeners and growers can determine which plants are most likely to thrive at a location. Montgomery County is within Zone 7. Powdery mildew -- white or gray fungal growth on leaves or stems. Reaction zone – natural boundary formed chemically within a tree to separate damaged wood from existing healthy wood. Reaction zones are important in compartmentalization. Renewable resource -- resources that continue to exist despite being consumed or can replenish themselves over a period of time even as they are used. Right of way -- an extension of a city or town’s control beyond the street edge, sometimes reaching 10 feet or more beyond the pavement. The Montgomery County Department of Transportation (MCDOT) Street Tree Maintenance program is responsible for the street trees in our county ROW.
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