Farm Forestry New ZealandDecay rate of Cypress stakes after two year’s exposure at the Whakarewarewa test site
By Jackie van der Waals, Ian Simpson, and Tripti Singh, June 2023.
Download SWP-T167 (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 in-ground exposure, the first Rotoehu Cupressus x ovensii stake failed giving the group an Index of Condition (I o C) of 7.3. The Riverhead Cupressus x ovensii group had an I o C of 7.5 and the Cupressus x leylandii group an I o C of 7.7.
In comparison, the CCA H4 treated radiata pine stakes have an I o C of 9.6 and the untreated radiata pine stakes an I o C of 3.0 (three stakes failed at this latest inspection).
This trial should continue and be assessed annually, with the next assessment due in April 2024.
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