Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8881607 | Journal of Stored Products Research | 2018 | 6 Pages |
Abstract
Phosphine (PH3) is used as an in-transit phytosanitary treatment (10-d fumigation period) for pine (Pinus radiata D.Don) logs exported from New Zealand to China. The ability of PH3 to penetrate through the bark of the logs is not well known. We designed equipment to accurately quantify PH3 penetration into the bark of wooden blocks (100â¯Ãâ¯100â¯Ãâ¯50â¯mm; nâ¯=â¯12) cut from the upper and lower trunk of recently harvested pine trees fumigated at 15 or 25â¯Â°C. Fumigations simulated commercial conditions consisting of two phases; phase I with 2.0â¯gâ¯mâ3 of PH3 for the first 5 days (1-120â¯h) and 1.5â¯gâ¯mâ3 of PH3 in phase II for the next 5 days (121-240â¯h). During the 10-d schedule, we achieved the required commercial CT (concentrationâ¯Ãâ¯time) of â¥48,000â¯ppmâ¯h at both temperatures. Bark thickness (i.e., trunk location) did not significantly affect fumigant penetration. Phosphine penetration through the bark of the wooden blocks was greatest after each application, then the penetrated concentrations diminished over time. Greater penetration occurred at 15â¯Â°C than at 25â¯Â°C. Further studies are required to better understand the dynamics of PH3 penetration particularly at lower temperatures and through insect-infested blocks.
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Authors
Matthew Hall, Pranoy Pal, Thamarath Pranamornkith, Anthony Adlam, Adriana Najar-Rodriguez, Alistair Hall, Don Brash,