Arborists & Tree Care Services
Arborists & Tree Care Services
This domain tests tree biology and practical care: pruning, planting, risk assessment, pest diagnosis, and safety. Answers should reflect accepted arboricultural standards and Minnesota pest timing.
Pruning
- Use the three-cut method on larger limbs: undercut, top cut, then final cut at the branch collar.
- Do not flush-cut or leave long stubs; do not top trees.
- Remove no more than about one-third of live crown in a season.
- Avoid pruning oaks April–July because of oak wilt; dead wood can be removed anytime.
Planting and establishment
- Locate the root flare and plant it at grade.
- Dig a wide hole; backfill with native soil and mulch 2–3 in. without touching the trunk.
- Water through establishment and remove staking ties after one to two seasons.
Risk, pests, and safety
- Assess targets, likelihood of failure, and consequences; document findings.
- Know major pests: emerald ash borer, oak wilt, Dutch elm disease, and buckthorn.
- Call 811 before digging; use PPE and follow ANSI Z133 safety practices.
Worked example
A 4-in. limb must be removed. First make an undercut about 1/4 through the limb, a few inches out from the collar. Make a top cut slightly farther out so the limb falls without tearing bark. Then remove the stub with a final cut just outside the branch collar, leaving the collar intact. Do not cut flush into the trunk.
Traps that cost marks
- Flush cuts and stub cuts.
- Topping as a size-control method.
- Pruning oaks in spring.
- Volcano mulch against the trunk.
- Working without a utility locate or documented risk assessment.