Arborists use a variety of knots for different purposes, ranging from climbing to rigging and securing tools. Some knots are favored for their strength, ease of tying and untying, or ability to hold under tension.
Here are a few commonly used knots in arboriculture…
- Bowline – Known for its reliability, the bowline creates a fixed loop at the end of a rope. It’s useful for creating an anchor point around a tree or branch that won’t tighten under load. Arborists often use it for attaching themselves or their equipment to a secure point.
- Running Bowline – A variation of the bowline that creates a noose which can tighten around a branch. This is particularly useful for removing limbs, as it secures the limb before cutting and allows for controlled lowering.
- Figure-Eight Knots – This family of knots, including the figure-eight on a bight, figure-eight follow-through, and figure-eight stopper, is used for creating secure loops and stopping ropes from running out of retaining devices. They are known for their strength and ease of inspection.
- Double Fisherman’s Knot (Grapevine Knot) – Often used for joining two ropes together or creating a prusik loop. It’s very strong and compact, making it a favorite for climbing applications where rope length needs to be adjusted or extended.
- Prusik Knot – A friction hitch that allows the climber to ascend or descend a rope with control. It’s adjustable and grips the rope tightly when weighted, but can slide when unweighted. This knot is for climbers using the Moving Rope System (MRS) or Single Rope Technique (SRT).
- Clove Hitch – Used for quickly securing a rope to a tree or branch. It’s easy to tie and untie, even under load, making it useful for temporary anchorage or when working with tools in the tree.
- Alpine Butterfly Knot – Allows the creation of a secure loop in the middle of a rope without needing access to either end. It’s useful for creating attachment points for tools or as a mid-line anchor point.
- Blake’s Hitch – A friction hitch commonly used for climbing, similar to the Prusik knot but often preferred for its smoother operation in moving up and down the rope.
These knots are tools for the arborist, each selected based on the specific task at hand, whether it’s climbing, rigging, or securing equipment. Mastery of these knots, along with an understanding of their applications and limitations, is crucial for safe and efficient tree care operations.
