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Using X-ray micro-CT to evaluate density loss in anobiid infested wood
2019 - IRG/WP 19-10956
Considering the relevance of wood borers in construction, the present study had as main objective the evaluation of the impact of anobiid damage on timber elements by establishing an empirical correlation between lost material percentage (LM%, consumed by beetles) and apparent density (original – OTD and residual – RTD). Since the beetles’ attack produces a diffuse damage with a set of tunnels in random directions and sizes, this makes quantification more difficult. In this context, micro-computed tomography (µ-XCT) is essential to enable better assessment of material degradation state as a function of lost material percentage/loss of density. The results showed a high correlation (r2 = 0.85) between RTD and LM% and a medium correlation (r2 = 0.60) between OTD and LM%. The various steps required during the µ-XCT study from the scanning procedure to the final quantitative results are also presented in this study enabling its use as guidelines for future studies.
J L Parracha, M F Pereira, A Maurício, P Faria, L Nunes
Analysis of larval development and feeding of an Anobiid beetle using X-ray computed tomography
2020 - IRG/WP 20-10961
Priobium sp., an anobiid beetle, can attack wood used for historic constructions in Japan. Its life history and feeding biology, especially larval development and behavior, are poorly understood because the beetles are hidden inside wood most of the time. We used X-ray computed tomography (CT) to regularly scan wood blocks infested with the larvae of the Priobium sp. and observed the process of their movement and development inside. The wood blocks were scanned at intervals of approximately 10 days from July 2019, and the analysis was based on the CT data until February 2020. The CT images clearly captured the silhouettes of the larvae, as well as parts of wood and frass. By registering the CT volume data obtained on different scanning dates, the movement of individual larvae could be traced. The larvae, in most cases, seemed to move about within the frass packed inside the wood blocks, instead of newly tunneling into undamaged parts of the blocks. By measuring the position coordinates of the larvae, their displacement in the scanning intervals was quantified. The larvae became inactive when the temperature dropped to around 10 °C. The body length of the larvae kept fluctuating, but no apparent growth was observed throughout the experiment.
H Watanabe, R Kigawa, Y Fujiwara, Y Fujii