Chemical wood preservative Borosol 9, consisting of boric acid - alkanolamine complex, is a new wood preservative with proven efficacy against wood decay fungi. However, we were interested in its efficacy against larvae of house longhorn beetle (Hylotrupes bajulus). Thus, experiment according to the EN 46 procedure was performed. Specimens made of Norway spruce wood (Picea abies) were brushed twice with 10 % Borosol 9 solution. The results showed that most of the larvae were able to tunnel into the treated specimens, but none of them were found alive after the test period of 12 weeks. On the other hand, all control untreated samples were damaged by H. bajulus larvae activity and 98 % of larvae survived. Results indicate that Borosol 9 has an efficient insecticidal activity and acts protective against wood boring insects.

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