Your search resulted in 327 documents. Displaying 25 entries per page.
Effects of drying processes on termite feeding behaviour against Japanese larch wood
2001 - IRG/WP 01-10390
We investigated the effects of current drying schedules for larch lumbers on the termite feedings. Thermal analyses were also conducted to investigate degradation of wood components. Choice feeding tests showed specimens dried under high-temperature schedules were evidently susceptible against termite attacks. These schedules produced the feeding-attractants, which were suggested by the TGA result...
S Doi, Y Kurimoto, H Takiuchi, M Aoyama
Preservative treatment and field test monitoring of spruce pole stock: Pressure and diffusible chemical treatments
1990 - IRG/WP 3605
One hundred and forty four spruce (test species) and southern yellow pine (reference species) poles were variously treated by center boring, incising, or kerfing, followed by pressure treatment with CCA and/or diffusible preservatives. The diffusible preservatives included NaF/creosote, borax and ammonium bifluoride. The poles were set at a test site and evaluated for preservative distribution and...
B Goodell, A J Pendlebury
An evaluation of chemical pre-treatments for controlling kiln brown stain in radiata pine
1997 - IRG/WP 97-30124
Clear radiata pine (Pinus radiata D. Don) is widely used for fine millwork owing to its attractive light colour. However, kiln drying of radiata pine sapwood often results in the development of a brown stain causing substantial loss in revenues in New Zealand's high-value export markets. In this study chemical pre-treatments were evaluated for their ability to control the formation of kil...
B Kreber, A McDonald
The suitability of high pressure sap-displacement for the retention of UK grown spruce and pine
1990 - IRG/WP 3595
The concentration and radial distribution of copper, chrome, arsenic (CCA), and the moisture content and depth of radial checking in UK grown, field exposed spruce and pine poles treated by high pressure sap-displacement are examined. The concentration of CCA elements in samples obtained from increment cores is similar in Norway spruce, Scots pine and Corsican pine but is significantly lower in Si...
P D Evans, S D Hainey, A Bruce, G M Smith, B King
Laboratory evaluation of potential antisapstain treatments for Pinus radiata
1983 - IRG/WP 3237
Twelve formulations were tested in the laboratory using a 'mini' board test for effectiveness on Pinus radiata (D. Don) against sapstain, mould and decay fungi. Three formulations, sodium pentachlorophenoxide (NaPCP) plus borax, Haipen 50 WP, and Mitrol 375, are used commercially in New Zealand. Busan 1009 (0.5% product), IWD Product A (0.2% ai), IWD Product B (0.3% ai), Fennotox...
J A Drysdale
Feasibility of using biological control agents to arrest and prevent colonization of Douglas fir and southern pine by decay fungi
1988 - IRG/WP 1345
The use of microfungi to control basidiomycetous decay has been evaluated in Europe for many years, where it has produced mixed results against Lentinus lepideus Fries, the fungus presumed to be the major cause of decay in Scots Pine poles. In the United States, remedial decay control has been largely chemical, with little use of alternative decay control strategies. Increasing restrictions on che...
J J Morrell, C M Sexton
The Efficacy of Wood Preservative Treatments in Laboratory Soil-Bed Test
2004 - IRG/WP 04-20289
The efficacy of wood preservatives were determined in laboratory soil-bed test. Pine and alder wood samples (10 x 10 x 10 mm) were treated with CCA (1, 2%), ACQ-1900 (2, 3%), ACQ-2200 (1, 2%), Tanalith E 3491 (2, 2,8%), Wolmanit CX-8 (1, 2%). The leached and unleached samples were exposed 76 days at Simlångsdalen soil and determined mass loss.
The results of this study showed that mass losses o...
A Temiz, T Nilsson, Ü C Yildiz, E D Gezer, S Yildiz
Venezuelan net of test fields for the study of the effectiveness of treatments of non commercial timbers from natural tropical forests
2005 - IRG/WP 05-20318
A net of 13 tests fields were established in Venezuela for the study of the effectiveness of the CCA and CCB treatment in secondary or non commercial woods from natural forests, two woods from fast growth plantations wee included for promote them as treated timber mainly for fence posts uses. Partial results after two years are presented and discussed the preliminary results obtained both in field...
O Encinas, N Mora
A novel solvent penetration assessment technique for wood preservativation treatments using waterborne systems
1990 - IRG/WP 2346
Solvent and hence solute (a.i.) penetration during any wood preservation treatment cycle and the flow pathways taken by the solvent in the wood are crucial elements in determining the adequacy of any treatment. Inadequate solvent penetration into specimens or an inappropriate tissue throughflow pattern during impregnation will markedly affect the distribution pattern achieved by many non-diffusibl...
A J Pendlebury, J Coetzee, E Sorfa, A Botha
Termites in Uruguay; control, prevention and environment
1991 - IRG/WP 1474
When Prof. La Fage's questionaire on termites was received by 1987, few were aware of termite damage in Uruguay and infestations were not much reported. Further contacts between scientists, operators and homeowners, are now shaping the real threat of termite attack. Before letting the problem faIl in the hands of the layman, with all ist environmental risks, it seemed reasonable to: 1) re...
A Aber, G Baillod
Trials of new treatments for prevention of kiln brownstain of white pine (Pinus strobus)
1995 - IRG/WP 95-30068
White pine (Pinus strobus) often develops a surface brown oxidative stain when kiln dried. Such stain downgrades high quality lumber and is most likely to occur when fresh, unseasoned lumber is stacked during warm weather prior to kiln drying. Use of reducing agents or pH alteration has been successful, but may have some practical limitations for general use. This study attempted to prevent browns...
E L Schmidt, E Christopherson, T L Highley, M H Freeman
Studies on the permeability of Norway spruce (Picea abies)
1987 - IRG/WP 2295
It is well known that the bordered pits play a dominating role for liquid transport in softwoods. The mechanism behind pit aspiration during drying or heartwood formation seems to be well understood. The reason why the fixation of the membrane (torus) to the pit opening remains almost irreversible is, however, still unclear. A technique has been developed combining so-called "solvent exchange dryi...
I Johansson, K Nordman-Edberg
Laboratory trial to identify potential in-forest treatments to control fungal pre-infections of radiata pine logs
2000 - IRG/WP 00-30220
Development of fungal infections of radiata pine logs by wood degrading fungi commences immediately after tree felling. In general, subsequent antisapstain treatments are unable to control fungal degrade on logs where the pre-treatment log storage time exceeds 2-5 days. However, use of an in-forest treatment of logs may be advantageous to log exporters to control fungal pre-infections during the p...
D R Eden, B Kreber, R N Wakeling, J G Van der Waals, C M Chittenden
Influence of different resin treatments on the dimension stability of wood
1997 - IRG/WP 97-40090
The dimension stability of wood is considered to be an important contribution to its durability and its performance in practice. A number of different treatments have been developed to improve the dimension stability of wood. One applied method is the treatment of wood with monomers or resins. The application of appropriate impregnation conditions seemed to be essential to enhance the efficiency o...
M Sailer, A O Rapp
Performance of different treatments and finishes on wood out of ground contact. Preliminary results
1984 - IRG/WP 2221
Pinus and Eucalyptus L-joints treated with CCA, a water dispersable PCP and untreated ones were painted according to seven different finish's schedules and exposed at two sites in State of Sao Paulo. After ten months of exposure, it was possible to verify that preservative treatment improve the performance of both wood and finish. It was also possible to observe that wood substrate, prese...
S Milano
Laboratory evaluation of copper naphthenate pressure treatments against the Formosan subterranean termite
1993 - IRG/WP 93-10005
Southern pine wafers and Douglas-fir cubes pressure treated with copper naphthenate in AWPA P9 Type A oil or in toluene were evaluated for resistance to attack by the Formosan subterranean termite, Coptotermes formosanus Shiraki (Isoptera: Rhinotermitidae). Wood samples were pressure treated to target copper retentions of 0.040, 0.075, 0.095, or 0.150 pcf, conditioned to simulate field exposure, a...
J K Grace, R T Yamamoto, P E Laks
Field testing of nootkatone and tetrahydronootkatone wood treatments against Coptotermes formosanus Shiraki
2003 - IRG/WP 03-30308
A component of Alaskan yellow cedar, citrus oil, and vetiver oil, nootkatone, and its derivative, tetrahydronootkatone, were tested for their potential as wood treatments against Coptotermes formosanus. Wood treatments dipped in 1% and 5% nootkatone and tetrahydronootkatone in ethanol or vacuum impregnated (5% only) were tested in a natural setting using termite infested bald cypress trees along t...
K E Nix, G Henderson, R Laine
Preservative treatment of Gollah cane (Daemonorops jenkinsiana) by soaking method
2001 - IRG/WP 01-40197
The feasibility of preservative treatment of gollah cane (Daemonorops jenkinsiana (Griff.) Mart.) by soaking method was tested in the present study. Cane samples of 1m, 2m and 3m long were soaked with 10% borax and boric acid solution. The study revealed that adequate dry salt retention (DSR) in the above samples could be obtained in 3 days, 4 days and 5 days of soaking, respectively. Within these...
M Younus-uzzaman, K Akhter, M H Chowdhury
The treatment of Douglas fir fence posts: specification and compliance using new European standards
1999 - IRG/WP 99-20178
New European standards for the preservative pre-treatment of timber require the results of the treatment process to be specified and subsequently verified by examination of the treated timber for penetration and retention of the preservative. For penetration, the standards are restrictive in that there are only a limited number of options available to the specifier. Thus for ground contact service...
R J Orsler, H Derbyshire
A field trial of water repellents as anti-sapstain treatment additives
1987 - IRG/WP 3417
The assessment of water repellents as anti-sapstain treatment additives has been included in a recent FRI research programme investigating improved surface protection of New Zealand Pinus radiata. Laboratory work has shown variation in water repellent effectiveness with chemical type and subsequently a field trial was established to examine the performance of selected water repellent/anti-sapstain...
J A Drysdale, D V Plackett
Disproportionate absorption of different constituents of CCA salts
1988 - IRG/WP 3484
Results of preliminary experiments carried out to study selective absorption of different constituents of CCA salts and sludge formation in commercial treatment, using Terminalia myriocarpa and Pinus kesia timbers, are reported in this paper. The objective of these experiments is to evolve simple and practical methods to prevent/minimise sludge formation and differential absorption of the constitu...
V R Sonti, S Sonti, B Chatterjee
Effect of some resin treatments on fungal degradation reactions
1999 - IRG/WP 99-10318
The effect of impregnation of wood with vegetable oil, tall oil and two water soluble on fungal degradation reactions was assessed by hydrolysis and enzyme activity measurements. The experiments were carried out by using isolated enzyme preparations and a living brown-rot fungus Poria placenta. The results indicate that the inhibitory effect of treatments was clearly directec towards the enzymatic...
A-C Ritschkoff, M Rättö, A J Nurmi, H Kokko, A O Rapp, H Militz
Failure of overhead power transmission and telecommunication poles in Tanzania: Causes, preventive and remedial measures
1988 - IRG/WP 3465
Unless measures are considered urgently to combat massive pole failures occuring in service, it is likely that wooden poles may soon become unpopular. Consequently, pole users may be forced to use costlier alternatives such as underground cables and concrete or steel poles. In trying to countercheck this trend, this paper names the main agents of pole failure, discusses different models of pole fa...
K K Murira
Pentachlorophenol and tributyltin oxide - the performance of treated Pinus radiata after 12 years' exposure
1986 - IRG/WP 3361
Pinus radiata samples were impregnated with a range of light organic solvent preservatives and copper/chrome/arsenic salt and exposed with no surface coating both in and above ground for 12 years. Inspection of the test samples revealed that some formulations of light organic solvent preservatives will give good fungal protection and reduce splitting in Pinus radiata exposed externally without a s...
R S Johnstone
Detoxification of methylene bisthiocyanate by bacteria isolated from freshly felled, anti-sapstain treated timber
1993 - IRG/WP 93-10017
The microbial defacement of freshly-felled timber treated with organic biocides continues to be a major problem in stored lumber. As part of a study to investigate the depletion in chemical activity of methylene-bis-thiocyanate (MBT) in green timber, bacteria were isolated from freshly-felled boards of Corsican pine (Pinus nigra var. maritima Arnold) previously treated with different biocides. The...
R J Wallace, R A Eaton, G R Williams