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On the occurrence of the Australian Lyctus parallelocollis Blackburn in Israel and how to distinguish from Lyctus brunneus (Steph.)
1978 - IRG/WP 194
In June 1976 attacked plywood was sent from Tel Aviv for determination of the insects concerned. An unknown Lyctus species and the asiatic Heterobostrychus aequalis (Waterhouse) were responsible for the damage. Further material sent by Dr. J. Halperin, Forestry Division, Ilanoth, in September 1976 and beetles of his field collection in 1977 revealed this Lyctus sp. to be a rather widely distributed and important wood-destroying insect in Israel. By isolating larvae from the plywood and breeding a sufficient number of insects could be obtained for further investigations. By cooperation with Ing. Agr. F.H. Santoro, Buenos Aires, and Dr. R. Demoiseau, Brussels, the Lyctus was compared and identified. By the help of Dr. Demoiseau and Mr. C.D. Howick, C.S.I.R.O., Melbourne, the original literature became available.
S Cymorek


The resistance of fifteen Indonesian tropical wood species to the powder post beetle Heterobostrychus aequalis
1990 - IRG/WP 1429
A preliminary laboratory test on the resistance of 15 tropical wood species to Heterobostrychus aequalis has been carried out using small samples of 7.5 x 5 x 1.5 cm³. The results reveal that Pinus merkusii and Agathis borneensis are very susceptible to Heterobostrychus aequalis. Other 13 species vary between susceptible to resistance There is no signifisant relation between starch content and the infestation of Heterobostrychus aequalis in the fifteen wood species.
Jasni, Nana Supriana


Visualization of Feeding Process of Larvae of the Wood-boring Beetles Using X-ray Computer Tomography
2019 - IRG/WP 19-10953
X-ray computer tomography (CT) was applied to observe the movement of the larvae of the wood-boring beetles Lyctus brunneus, Lyctus africanus, and Heterobostrychus aequalis inside the infested wood specimens. The larvae bred with artificial diet were inserted into the hole of wood specimens of rubber wood Hevea spp. or Japanese oak Quercus crispula. The wood specimens with larvae were scanned using the microfocus X-ray CT system every 3 to 7 days. In the CT images, with the voxel size of 61.9 μm, the figures of the larvae and other stages of the beetles were clearly visible and were distinguished from wood, tunnels, and frass. It was also possible to trace the movement of larvae, mostly along the fiber direction. However, all of the larvae of H. aequalis had hardly bored and had pupated or died near the inner surface of the specimen, in this study. The CT images were also used to evaluate the amount of wood bored by a larva. The larva was traced until pupation and the time courses of tunnel length and volume were estimated by measuring the changes in the length and volume of the tunnel in pixels. Thus mean tunnel length and volume of larvae of L. brunneus or L. africanus are estimated to by 1.89 mm and 6.64 mm3, or 1.38 mm and 3.12 mm3 per day, respectively.
Y Yanase, H Watanabe, I Fujimoto, T Yoshimura, Y Fujii