Unpeeled billets of Corsican pine were treated with the following: 5% aqueous disodium octaborate tetrahydrate (DOT) solution; 5% DOT solution with an isolate of Trichoderma viride with a low susceptibility to borate; the Trichoderma viride isolate alone. Half of the billets in each treatment group were also placed in large-diameter plastic pipes to protect the billets from the weather. All three treatments gave good control of decay. Sheltering had no effect on the efficacy of any of the treatments, despite a significant weathering and leaching being present for the duration of the eight-month trial. These results suggest that boron-based preservatives may be viable treatments for controlling pretreatment decay in the forest situation.

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