An antisapstain trial was conducted on two sites (Alexandra and Trentham) in order to establish the concentration of a newly registered antisapstain preservative (consisting of benzalkonium chloride (BAC) & 3-iodo-2-propynyl butyl carbamate (IPBC) & disodium octoborate (boron)) needed to prevent stain of Eucalypt timber. After 20 weeks of exposure at the Trentham site, the water treated boards had a mean fungal degrade of 98.8%. Those boards treated with the BAC & IPBC & boron at 1.5, 2.25 and 3.5% had a mean degrades of 31, 10.4 and 12% respectively. Boards treated with DDAC & IPBC 1% had a mean degrade of 18.8% at 20 weeks exposure. After 8 weeks exposure at the Alexandra site, the water treated boards had a mean fungal degrade of 75%. Those boards treated with the BAC & IPBC & boron at 2.25% had a mean degrade of 10.8%. BAC & IPBC & boron at all concentrations tested at both locations was effective in preventing the stain found on the control (water treated) boards after 8 and 20 weeks exposure.

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