ISA Certified Arborist Municipal Specialist

Under ISA tree risk assessment principles, what three components must all be present for a tree to pose an actual risk?

• ADecay, lean, and deadwood
• BA likelihood of failure, a target, and a consequence
• CWind, soil moisture, and species
• DAge, height, and trunk diameter

In the ISA Tree Risk Assessment matrix, 'likelihood of failure' is combined with which other factor to determine the 'likelihood of failure and impact'?

• ALikelihood of impacting a target
• BConsequences of failure
• CCost of mitigation
• DTree species tolerance

A municipal arborist conducts a walk-by inspection of street trees from the sidewalk without probing or aerial inspection. Which ISA TRAQ level of assessment is this?

• ALevel 1 (limited visual)
• BLevel 2 (basic)
• CLevel 3 (advanced)
• DLevel 4 (aerial rope inspection)

Which document is the consensus U.S. industry safety standard for arboricultural operations that a municipal tree program should require its crews to follow?

• AANSI A300
• BANSI Z133
• CASTM D1196
• DISO 9001

A 'target' in tree risk assessment is best defined as:

• AThe specific tree part likely to fail
• BAny person, property, or activity that could be injured, damaged, or disrupted by a tree…
• CThe decay column inside the trunk
• DThe wind direction at the time of inspection

Target occupancy rate is used in risk assessment primarily to estimate:

• AThe structural strength of the trunk
• BHow often a target is present within the failure zone
• CThe tree's annual growth rate
• DThe replacement cost of the tree

Which of the following is a recognized structural defect that increases a tree's likelihood of failure?

• AA single dominant leader with good taper
• BIncluded bark in a codominant union
• CRadial trunk symmetry
• DA well-developed root flare

When documenting a tree risk assessment for a municipality, the most defensible records include:

• AOnly a verbal report to the supervisor
• BThe assessment date, method/level, identified defects, targets, risk rating, and recommen…
• CA photograph with no notes
• DThe arborist's personal opinion of beauty

A municipality is more likely to be found liable for a tree failure under which legal concept when it had constructive or actual notice of a hazardous tree and failed to act?

• AForce majeure
• BNegligence
• CEminent domain
• DAdverse possession

Which tree condition is the strongest indicator of potential root or root-collar problems that increase whole-tree failure risk?

• AA pronounced, well-flared root collar
• BA trunk that enters the ground straight like a telephone pole with no visible flare
• CVigorous spring leaf-out
• DSmooth, intact bark on the upper trunk

After a severe storm, what is the FIRST priority for a municipal tree crew responding to downed trees touching or near electrical lines?

• ABegin cutting immediately to clear the road
• BTreat all lines as energized and keep the public and crew clear until the utility confirm…
• CPhotograph the scene for insurance before anything else
• DApply wound dressing to the broken stems

A municipal risk-management policy that defines a maximum acceptable inspection interval for high-use park trees primarily helps to:

• AEliminate all tree risk permanently
• BDemonstrate a systematic, reasonable standard of care and reduce liability exposure
• CAvoid the need for any documentation
• DReplace the need for ISA-qualified assessors

Which mitigation option reduces risk by removing the target rather than altering the tree?

• ACrown reduction of the defective limb
• BCabling and bracing
• CRelocating a park bench out from under a hazardous limb
• DRemoving the entire tree

A 'residual risk' in a tree risk assessment report refers to:

• AThe risk that existed before the tree was planted
• BThe risk that remains after recommended mitigation is implemented
• CThe cost of the mitigation work
• DThe risk transferred entirely to the contractor

Which of the following best characterizes an 'imminent' likelihood of failure in the ISA system?

• AFailure is expected within the next assessment cycle under normal conditions
• BFailure has already started or is most likely to occur in the near future, even with norm…
• CFailure is not likely during the assessment period
• DFailure could occur only during an extreme weather event

Personal protective equipment required for a ground worker assisting a chainsaw operation under ANSI Z133 includes, at minimum:

• AHead, eye, and hearing protection plus leg protection when operating a chainsaw on the gr…
• BOnly gloves
• CA reflective vest alone
• DNo PPE if the worker stays 3 meters away

A municipal arborist must decide how to handle a large heritage oak with significant trunk decay but high community value over a moderately occupied picnic area. The most balanced risk-informed approach is to:

• ARemove it immediately to eliminate liability
• BQuantify the risk, present mitigation options (e.g., restrict access, reduce crown, incre…
• CIgnore it because the tree is valued
• DCable the entire tree without assessment

Which tool is most appropriate for an advanced (Level 3) assessment to estimate the extent of internal trunk decay?

• AA clinometer
• BA resistance-recording drill (resistograph) or sonic tomograph
• CA diameter tape
• DA refractometer

When prioritizing storm-damage cleanup across a city, which tree-related situation should generally receive the highest immediate response priority?

• AA leaning tree in a vacant lot
• BA tree blocking access for emergency vehicles or contacting an occupied structure
• CMinor deadwood in a park
• DCosmetic bark damage on a boulevard tree

A 'restricted' or 'limited' risk assessment scope statement in a municipal report is important because it:

• AGuarantees no tree will ever fail
• BClarifies what was and was not evaluated, the time frame, and conditions, defining the as…
• CTransfers all liability to the homeowner
• DEliminates the need for reassessment

Deadwood in the crown of a street tree over a busy sidewalk is primarily a concern because it affects:

• AThe overall aesthetic value only
• BThe likelihood of failure of branch parts that could strike pedestrians (targets)
• CThe tree's photosynthetic rate
• DThe soil pH around the tree

Which statement about wind load and tree failure is correct for risk assessment?

• AWind load is irrelevant to tree failure
• BGreater exposed crown area and a recently changed wind exposure increase failure likeliho…
• CRemoving all foliage is the standard way to reduce wind load on healthy street trees
• DWind load only affects conifers

For a municipal tree program, the most effective way to manage risk across thousands of trees with limited staff is to:

• AAssess every tree at the advanced (Level 3) level annually
• BUse a systematic program: limited visual surveys to flag suspects, then basic/advanced as…
• COnly inspect trees after a complaint is filed
• DRemove all mature trees to reduce exposure

A crack that extends through the bark and into the wood of a main stem, especially when paired with decay, is significant in risk assessment because it indicates:

• ANormal seasonal bark shedding
• BA potential plane of weakness that can reduce load-bearing capacity and increase failure…
• CImproved compartmentalization
• DHigher drought tolerance

Why is it important for a municipality to keep records of tree risk assessments and completed mitigation work?

• ARecords are only needed for budgeting
• BThey provide evidence of a proactive, reasonable standard of care that supports defense a…
• CRecords guarantee immunity from all lawsuits
• DThey are required to obtain a building permit

Construction near an established street tree most commonly causes failure or decline through:

• APainting the trunk
• BRoot severance and soil compaction within the critical root zone
• CAdding a tree grate
• DLight pruning of low branches

Which environmental sign at the base of a tree most strongly suggests recent root-plate movement and elevated failure risk?

• AA flush of epicormic shoots
• BSoil heaving, cracking, or a mound on the side opposite a lean
• CA new layer of mulch
• DLichen growth on the bark

In communicating tree risk to elected officials, the assessor should express risk primarily as:

• AA guarantee of safety
• BA categorized risk rating (e.g., low, moderate, high, extreme) with the basis and recomme…
• CA single yes/no answer
• DThe dollar value of the tree only

A traffic-control plan and proper work-zone setup for a municipal tree crew working on a busy street is mandated mainly to protect:

• AOnly the trees
• BThe crew and the traveling public from vehicle-related hazards
• CThe city's social media image
• DThe chainsaw from damage

Which factor is part of estimating the 'consequences' of a tree failure rather than its 'likelihood'?

• AThe presence of trunk decay
• BThe severity of potential injury or property damage if the part strikes the target
• CThe degree of trunk lean
• DThe amount of included bark

Under ANSI A300 Part 1, removing a branch back to the branch collar without cutting into the collar is important because it:

• ASpeeds up nutrient flow to the roots
• BPreserves the tree's natural ability to compartmentalize the wound and resist decay
• CMakes the tree grow faster
• DIs required only for conifers

Which pruning practice is discouraged by ANSI A300 because it removes inner foliage and concentrates weight at branch ends?

• ACrown cleaning
• BLion-tailing
• CCrown raising
• DStructural pruning

For young street trees, the most cost-effective long-term municipal practice to reduce future risk and maintenance is:

• ATopping at planting to control height
• BStructural (formative) pruning to establish a single dominant leader and good branch spac…
• CNo pruning until the tree is mature
• DAnnual heavy crown reduction

Topping a mature tree is considered an unacceptable practice mainly because it:

• AProduces too much shade
• BRemoves large amounts of the crown, causes decay at heading cuts, and stimulates weakly a…
• CImproves the tree's structure
• DIs too expensive to perform

When planting a containerized street tree, the root flare should be positioned:

• AWell below grade to anchor the tree
• BAt or slightly above finished grade
• CAt least 30 cm below grade
• DDoes not matter as long as it is watered

A 2-to-4-inch layer of organic mulch around a newly planted street tree should be applied so that it:

• AIs piled against the trunk in a 'volcano'
• BIs kept several inches away from the trunk in a wide, flat ring
• CCompletely covers the root flare
• DIs replaced with crushed stone touching the bark

The single most important maintenance practice for survival of newly planted municipal trees during the establishment period is:

• AHeavy nitrogen fertilization at planting
• BRegular, appropriate irrigation
• CAnnual crown reduction
• DTrunk wrapping year-round

Selecting trees of varied genera and species across a municipal planting program primarily protects the urban forest against:

• AHigh planting costs
• BCatastrophic loss from a single pest or disease, such as Dutch elm disease or emerald ash…
• CExcessive shade
• DSlow growth rates

The '10-20-30' species-diversity guideline for urban forests recommends no more than:

• A10% of any species, 20% of any genus, 30% of any family
• B10 trees per block, 20 per street, 30 per park
• C10% conifers, 20% deciduous, 30% evergreen
• D10-year, 20-year, and 30-year planting cycles

'Right tree, right place' for street tree selection most directly means matching the tree to:

• AThe cheapest available nursery stock
• BThe site conditions and constraints, including mature size, soil, and overhead/undergroun…
• CThe mayor's favorite species
• DWhatever is in bloom that month

Under power distribution lines, the most appropriate municipal street-tree choice is generally:

• AA large shade tree such as a pin oak
• BA small-maturing tree (e.g., a small ornamental) that will not grow into the conductors
• CA fast-growing poplar
• DA tall columnar conifer

Soil compaction in urban planting sites harms trees primarily by:

• ARaising soil pH to toxic levels
• BReducing pore space, limiting oxygen and water movement to roots
• CIncreasing organic matter too quickly
• DAttracting beneficial mycorrhizae

Providing adequate soil volume (rooting space) for street trees is important because soil volume largely determines:

• AThe color of fall foliage
• BThe mature size, health, and longevity the tree can achieve
• CThe bark texture
• DWhether the tree flowers

Which approach best addresses sidewalk damage caused by surface roots of mature street trees while preserving the tree?

• ACutting all surface roots flush to the trunk
• BUsing root-friendly solutions such as flexible/ramped pavement, root paths, or reposition…
• CRemoving the tree in every case
• DApplying herbicide to the root zone

An Integrated Pest Management (IPM) program for municipal trees emphasizes:

• ACalendar-based blanket pesticide spraying
• BMonitoring, thresholds, and using least-toxic controls only when justified
• CRemoving all host trees preemptively
• DRelying solely on broad-spectrum insecticides

Emerald ash borer (EAB) management in a municipal ash population typically involves all EXCEPT:

• AInventorying and monitoring ash trees
• BTreating high-value ash with systemic insecticides
• CPhased removal and replacement of declining ash
• DTopping all ash trees to slow the borer

Per ANSI A300, the amount of live foliage that should generally NOT be exceeded when pruning a mature, healthy tree in a single operation is about:

• A5%
• B25%
• C60%
• D90%