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Studies on the infesting behaviour of the Formosan termite, Coptotermes formosanus Shiraki and its physical control
1983 - IRG/WP 1174
An outline of termite damage to buildings in Japanese National Railways, wood-infesting behavior, attacked traces in PVC-sheathed cables by termites, detection method of termites and the physical control method of the Formosan termite are given in the present paper.
K Yamano

Effects of seed origin and site on both wood density and longitudinal fluid uptake of Sitka spruce (Picea sitchensis (Bong.) Carr.) with height in the tree grown in the United Kingdom
2002 - IRG/WP 02-40226
The variation in density and longitudinal fluid uptake was investigated in short specimens of wood taken from eight seed origins of Sitka spruce trees grown at two sites in the UK. Five trees of each seed origin at each site were sampled at three heights (1, 2 and 3 m above ground level). The density of the samples decreased with increasing height within the stem. This corresponded with increasing ring width. The change of the longitudinal fluid uptake from base to apex showed an inverse trend to density. Site had an effect on density and increased density reduced fluid uptake. Seed origin had a marked effect on density and fluid uptake but the two factors showed no correlation. Some seed origins showed a variety of desirable characteristics and recommendations are made for the selection of seed origins for further UK plantations based on growth rate, density, tree form and permeability.
I Usta, M D C Hale

Intraspecific variability of durability of Wapa courbaril (Eperua grandiflora) against Antrodia sp. and Coriolus versicolor: effect of radial and height position in the stem
2004 - IRG/WP 04-10531
The variation of a lesser-used species, Eperua grandiflora attacked by brown and white rot has been examined. Trees of this specie showed differences in their behaviour against the type of rot used and also showed evidence of intra and inter tree variation. The “tree” effect is very significant concerning natural resistance. In the same way, there is variation of durability observed according to radial and vertical position in the stem. Although the vertical effect is less significant from practises point of view.
N Amusant, J Beauchêne, M Fournier

In vivo growth study on two gymnosperms and four angiosperms for REB wood poles
1998 - IRG/WP 98-10246
Revealed that the highest growth rates and pole yield in two plantation sites in Bangladesh are significant with 2.06 cm/y in diameter, 0.97 m/y in height and 90% pole yield within 19y in Pinus caribaea; 1.96 cm/y, 0.91 m/y and 100% pole yield within 15y in Xylia dolabriformis; 1.88 cm/y, 0.91 m/y and 22% pole yield within 13y in Dipterocarpus turbinatus; 1.64 cm/y, 0.82 m/y and 28.75% pole within 13y in Hopea odorata; 1.33 cm/y, 0.44 m/y and 100% pole yield within 28y in Polyalthia longifolia and 1.07 cm/y, 0.45 m/y and 00% pole yield within 15y in Podocarpus neriifolia. The study indicated that with 1.8m x l.8m spaced monocultured well managed plantation might produce about 33% poles within first 10y, additional 33% within 15y and rest 33% within 20y from Pinus caribaea, Xylia dolabriformis and Dipterocarpus turbinatus. Similar pole yield would be expected from Hopea odorata with rotation of harvesting of 15, 20 and 25y and from Polyalthia longifolia, Podocarpus neriifolia of 20, 25 and 30y. Revealed that the rate of growth in diameter increases with the increase of space of plantation and rate of growth in hight increases with the decrease of space between trees.
A K Lahiry

The effect of stack height on the performance of preservatives used for the prevention of sapstain on seasoning wood
1997 - IRG/WP 97-10192
The performance of three anti-sapstain preservatives was investigated under field conditions in south east England. The preservatives under test were: copper-8-quinolinolate (Mitrol PQ8) trimethylalkylammoniumchloride and sodium hexanoate (Sinesto B) and chlorothalonil (Tuff Brite). The preservatives were tested on Corsican Pine grown in south east England. The field trial was set up to investigate the robustness of the field trial protocol laid down as part of a collaborative European research project. Treated boards were close stacked and were assessed at 12, 18 and 24 week intervals. The test preservatives varied in efficacy: copper-8-quinolinolate (Cu-8) performed better than the quaternary ammonium compound (Quat) and chlorothalonil. However, very little mould colonisation occurred on the chlorothalonil treated boards compared with the boards treated with the other anti-sapstain preservatives. Observations also indicated that mould fungi were more prevalent on the upper boards of the top packs and that sapstain was heaviest on the bottom boards of the packs for all treatments. The results clearly showed that the height of the stacks had an effect on the infection pathways of colonising fungi and timber closer to ground level was clearly exposed to the greatest hazard. Statistical analysis supported this observation. Comparative field trials assessing antisapstain preservative performance should be set with the test stacks in a single layer at ground level.
J R Williams, D J Dickinson, J F Webber