Specialty Timbers New ZealandDecay rate of Cypress stakes after two years six months exposure at the Whakarewarewa test site
By Jackie van der Waals, Ian Simpson, and Tripti Singh, October 2023.
Download ITP-TR011 (pdf)
Executive summary
Stakes of Cupressus x ovensii grown in Rotoehu and Riverhead, and Cupressus x leylandii (Leyland cypress) were installed in the Whakarewarewa outdoor test area in April 2021. Untreated radiata pine and CCA H4 treated radiata pine stakes were also included for comparative purposes.
After two years 6 months in-ground exposure, the second Rotoehu Cupressus x ovensii stake failed giving the group an Index of Condition (I o C) of 7.1. The Riverhead Cupressus x ovensii group had an I o C of 7.3 and the Cupressus x leylandii group an I o C of 7.5.
In comparison, the CCA H4 treated radiata pine stakes have an I o C of 9.3, and the untreated radiata pine stakes an I o C of 2.6 (four stakes from this group of ten have failed).
This trial will continue and will be assessed annually, with the next assessment due in April 2024.
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