Most of those who participate in tree climbing are practising tree surgeons and the format is similar in concept to the pentathlon in track and field, with five disciplines giving competitors a cumulative points score.
The top-scoring climbers then go on to contest a "climb off" (known as the Masters event) in a particularly challenging tree to decide the final placings.
It is a cut-throat sport which requires skill, courage and extreme fitness and, importantly, the ability to respond to high-pressure situations.
Three-times world women's champion Chrissy Spence of Gisborne will be attending the championships but in a non-competitive role.
She signalled her retirement after winning at Parramatta and will be part of the judging panel in Masterton.
Australian Joe Harris is expected to make a bold showing in the men's event, having placed second at the last world championships behind Kiwi Scott Forrest, who could also be among the starters this weekend.