Building furniture made from massive wood is becoming more and more popular. Intrinsic resistance and structural protection of the wood do not always help against the attack of Hylotrupes bajulus (Hylotrupes bajulus L.). Its attack can be prevented by chemical wood protection with biocides, which are on the other hand harmful to the environment. Therefore, during the past years the non-chemical way to protect the thermal modification is coming into usage. Thermally modified wood resistance to Hylotrupes bajulus was tested according to the standard SIST EN 46. Samples were thermally modified at the temperature 170, 190, 210 and 230 °C. It was found out that the sapwood samples of Norway spruce and Scotch pine regarding the volume of damage caused by larvae do not differentiate. We found out that samples of Norway spruce and Scots pine do not differ one from another as far as maggots' attacks are concerned. Control samples of both types of wood didn't show any protection whatsoever. There is also no perfect protection in samples which were thermally modified at the temperature of 170 °C. Boosting the temperature from 190 to 230 °C the wood resistance to attack of Hylotrupes bajulus is total. Thermally modified wood resistance depends on the modification temperature; the higher the temperature the higher the resistance level.
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