Arboriculture I

ADL - Academy for Distance Learning

£ 325 - (363 )
zzgl. MwSt.

Wichtige informationen

  • Kurs
  • Fernunterricht
  • 100 Lernstunden
  • Dauer:
  • Wann:
    Freie Auswahl

This course develops your skills and understanding in diagnosis and treatment of tree disorders, whether pests, diseases, nutritional or water problems, or something else. You learn about the standard tree surgery practices, to prune and train both young and established trees, and safety measures to follow.

Wichtige informationen

Wo und wann

Beginn Lage
Freie Auswahl
Distance Learning

Was lernen Sie in diesem Kurs?

Environmental Conservation
Agricultural Science
Crop Science
Plant Science
Plant Biology
Biology Science
Tree felling supervision
Tree Biology


Course Code: BHT106.ARB
Duration: 100 hours
Start: Anytime- from anywhere in the world!
Qualification: Certificate
Choose mode of Delivery: CD-ROM, online or correspondence (paper based) 

Lesson Structure There are 8 lessons in this course:


  1. Introduction to Arboriculture
    • Trees in the garden, Planting in the right position, Choosing the right variety, Choosing the right specimen, How to plant different types of trees, Transplanting, Tree Guards, Using a Tree Report Form
  2. Tree Biology
    • Tree growth, Photosynthesis, Respiration, Transpiration, Vernilisation, What makes foliage change colour, Tree physiology, Roots, Stems, Leaves, Bud types, How a tree grows, Vascular tissue, Cambium, Xylem, Phloem, Secondary growth, Growth rings, Heartwood, Sapwood, Compartmentalisation, Water and plant growth, Growth rate factors, Arboricultural terminology
  3. Soils In Relation to Trees
    • Fertilising, Compacted soils, Tree health and drainage, Treating soil over winter, Changed soil levels around trees, Measuring pH, Measuring soil organic content, Measuring water content, Determining fertiliser solubility, Testing affect of lime on soil, Laboratory testing of soils, Soil texture, Measuring salinity, Soil horizons, Soil Naming, Soil nutrition, Fertilisers, etc
  4. Diagnosing Tree Problems
    • Tree health disorders, Frost protection, Minimising frost and wind damage, Mulch and frost, Missletoe, Diagnosing problems, Conducting a Tree inspection
  5. Tree Surgery
    • Tree surgery-do you need it, Review of techniques, Tree surgery safety, Safety and the worker, Public safety, Safety regulations, Cavity treatments, Bracing, Cabling, Propping, Bark wounds, Tree climbing techniques, Knots, Anchoring points, etc.
  6. Pruning of Trees
    • Pruning objectives, Removing branches, Crown cleaning, Crown thinning, Crown reduction, Crown lifting, Crown renewal, Fruit tree pruning, Felling a whole tree, Felling sections of a tree, terminology.
  7. Aboriculture Equipment
    • Secateurs, Hand saws, Power tools, Safety with electricity, Engine and tool maintenance, Chain saws, Hedge trimmers, Ladders, Harnesses, Ropes, Pole belt, Spurs, etc
  8. Workplace Health and Safety
    • Duty of Care, Lifting & manual handling, Protective equipment, Handling tools and machinery, Auditing tools and equipment

Each lesson culminates in an assignment which is submitted to the school, marked by the school's tutors and returned to you with any relevant suggestions, comments, and if necessary, extra reading.


  • Describe measures to provide healthy trees in different situations, including appropriate plant selection.
  • Explain tree biology, including morphology, anatomy and physiology, as it relates to arboriculture.
  • Develop procedures to manage soils for improved tree growth.
  • Develop procedures for managing health disorders with trees, including environmental, pest and disease problems.
  • Determine surgical techniques commonly used in arboriculture to repair damage to plants
  • Explain tree surgery techniques commonly used in arboriculture to prune growth.
  • Determine appropriate equipment for arboricultural practice.
  • Determine appropriate workplace health and safety practices for an arboricultural workplace.

What You Will Do

  • Distinguish between plants in order to identify at many different trees.
  • Develop a standard tree report form, customised for surveying the condition and use of trees in your locality.
  • Explain how to treat three specified soil related problems that can effect trees.
  • Develop a twelve month program, for managing a health problem detected by you in an established tree.
  • Demonstrate bridge grafting across a bark wound.
  • Distinguish between different methods of pruning including:
    • Canopy reduction -Cleaning out -Topiary -Espaliering
  • Determine the minimum equipment required to commence business as a tree surgeon.
  • Compare different chainsaws, to determine appropriate applications for each.
  • Determine legislation which is relevant to a specific arborist in a workplace which you visit.

Sample of Some Course Notes:

1. Compartmentalisation - How a tree rots

The process of compartmentalisation refers to how a tree naturally resists pathogen attack. It was first described in the 1970s and 1980s by an American scientist, Dr Alex Shigo. He described it as the CODIT system: compartmentalisation of decay in trees. The following is a summary of this process.

If a tree is healthy it has a natural tendency to contain the spread of wood rots as explained below:

Tree trunks and branches are made up of a series of "compartments†. The compartment walls are not actual anatomical features, but are naturally occurring boundaries within woody stems.

  • Disease/wood rots find it more difficult to break through one compartment into the next than spread within a compartment.
  • When microorganisms first attack a tree, chemicals are deposited around the wound which create a barrier to the spread of infection.
  • Some microorganisms can grow through this barrier, allowing other microorganisms to move in behind the first invaders. A snowball effect can occur, with successions of microorganisms causing further damage, and making the spread of infection difficult to contain.
  • Another "compartment" which acts to prevent the spread of decay is the "wall" of new wood and bark tissue which is produced each year. (ie. each ring you see in the cut section of wood is a barrier to infection).
  • Wood rots thus move up and down a trunk (within a tree ring) than they do further into the centre of the tree.

The Importance of Compartmentalisation to Arborists
Trees vary in their ability to compartmentalise decay. Some species do not readily form compartments, for example, Populus (poplar), Salix (willow), Brachychiton, Erythrina (coral tree) and Liriodendron (tulip tree) species.

)Tree vigour, pathogen virulence and the effects of further wounding are also important factors. Tree surgery practices such as pruning, bracing and cavity treatment, which inflict further wounds on trees, may interfere with this natural process and cause the decay to spread to new wood. For this reason, cavity drilling and rod bracing of cavities are no longer standard arboriculture techniques (see next section on Tree Surgery Techniques).

What Makes Foliage Change Colour In Autunm?
Deciduous plants shed their leaves in autumn or early winter, and are fully or partially devoid of foliage over the colder months of the year. This is an adaptation that allows the plant to better survive unfavourable conditions (such as extreme cold).

Prior to leaves dropping they undergo a period of senescence.

Senescence is the period during which leaf cells progressively die

Over this senescence period, tissue at the leaf base progressively dies, until finally a complete section of tissue between the leaf and the stem is dead (At this point there is nothing left to hold the leaf to the stem; so it detaches and drops to the ground.)

As senescence occurs, the amount of chlorophyll in the leaf (which gives it the normal green colour) reduces. Chlorophyll is actually only one of many pigments that generally occur in leaves; but it is usually the strongest pigment, and for that reason alone, most leaves usually appear green if the plant is healthy.

Other types of pigment chemicals commonly found in leaves include:

  • Anthocyanins â€" Reds, Blues and Purples
  • Carotenoids â€" Yellows and Oranges

Generally carotenoids also decompose rapidly in autumn, but anthocyanins break down much more slowly.

Often anthocyanins can still be at close to 100% normal levels when only 40% of normal chlorophyll and carotenoids remain. Anthocyanins are produced through chemical processes, from excess sugars in the leaves, particularly in the presence of bright light. In view of this fact; the level of anthocyanins will be stronger if the plant has been actively photosynthesising (producing sugars) over summer, combined with lots of bright autumn days (if weather is frequently overcast and dull in late summer and autumn; the production of anthocyanins is decreased).

Lower temperatures in autumn reduce the movement of sugar around the leaf, so if the weather changes from warm to cool fast, the leaf sugar remains high and anthocyanins build up; otherwise the levels of these pigments might not be so high. High levels of anthocyanins will generally result in more vivid autumn foliage colours.

Variations Autumn colour can still vary from plant to plant within a species. Variations include:

  • the time at which colour occurs (some produce colour earlier, others later)
  • the duration of colour (some maintain good colour for longer periods)
  • the intensity of colour

Such variations can be affected by:

  • duration of seasons
  • severity of seasons
  • whether climatic changes are gradual or more abrupt
  • aspect (whether it faces north or south, east or west
  • degree of protection (whether it is exposed or protected by walls or other plants)
  • genetics
  • sex (eg. parentage of cutting/grafting material can have a significant effect in some plants

Example of Assignment Work

Set task

Find some wounds on trees. Using some firm wire, a chisel and any other tools you might find appropriate, prod into the wound to see what wood is infected. How far does the rotten wood go into the main trunk or the main part of the branch? How far does the rot move up or down the length of the stem or branch? If you can - cut a rotten section out of a tree to see exactly where the rot has occurred; what is the pattern of the rot?


1. In your own words, explain what compartmentalisation is, including its function and significance submit about ½ page.

2. Explain in your own words the process of photosynthesis, including the chemical reactions involved submit ½ to 1 page.

3. Using diagrams - show the difference between the way phloem and xylem function.

4. Explain in about ½ page, the physiological processes which cause a tree to increase in size.