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Performance of surface-treated hardwoods and softwoods out of ground contact
1990 - IRG/WP 3592
A number of fungicides were tested as brush treatments for protection of southern pine, Douglas-fir, maple, and red oak against decay above ground. Cross-brace and L-joint test units were treated just before assembly and exposed from 3-10 years. Untreated Douglas-fir cross-brace units were not decayed at either the Mississippi or Madison, WI, site. Untreated red oak cross-brace units were not decayed at the Madison site. The two hardwood species were more difficult to protect from decay than the softwood species. Decay development in maple cross-brace units was considerably slowed by several of the treatments but none of the treatments provided complete protection from decay during the 9 or 10 years exposure in Mississippi. Most of the treatments did not reduce decay development in red oak cross-brace units. Many treatments protected pine cross-brace units. The L-joints were exposed for only 3-4 years, but appear more difficult to protect from decay than the cross-brace units.
T L Highley


Thirty-four year test of on-site preservative treatments to control decay in wood above ground
1993 - IRG/WP 93-30015
This research was initiated in 1958 to investigate efficacy of various preservatives and treating methods for new lumber going into exterior structures of buildings. Post-rail units (2x4 inches) constructed of Southern Pine sapwood, Douglas-fir heartwood, and mill run western hemlock were dip- or brush-treated before or after assembly. Units were trested with pentachlorophenol in various petroleum solvents or with copper napthenate in mineral spirits. Both painted and unpainted units were exposed on a test fence in Madison, WI. Most of the painted untreated pine units (controls) failed by 34 years. Surprisingly, painting completely protected the untreated Douglas-fir units from decay and afforded substantial protection to untreated hemlock. Significant decay in painted units was present only in lightly treated pine units (2-second dip after assembly or brush treated). Copper napthenate (1% copper) was markedly less effective than the penta treatments on unpainted pine and hemlock units. There was no evidence that type of oil carrier or incorporation of a water repellent improved effectiveness of treatment. Three or 15-minute dips in penta were equally effective. Penta-grease applied to unit ends only was effective.
T L Highley, T C Scheffer


Practical testing of wood preservatives to prevent weathering damage and infection by micro-organisms on spruce and pine
1989 - IRG/WP 3530
Brush application, is generally used to prevent wooden window frames from decay caused by influence of weathering and fungi. Accordingly 10 boards of pine (Pinus sylvestris) and spruce (Picea abies) were treated with 10 commercially used wood preservatives. The efficiency of fungicides by using chiptest and blue stain test (EN 152), the effectiveness against weathering as well as the course of colonization of microfungi were measured on boards, that had been hurted by sawing. Results after one year's exposure showed that neither the normally required amount of 250 ml/m² nor the effective depth of penetration of the fungizidal equipment had been realized by using brush application. The smaller the permeability of the coating system, the more likely ideal conditions for the growth of fungi (e.g. basidiomycetes) are provided, answering hurtings of the coating and moisture contents of more than 30%. The variety of fungi (on pine 32 and on spruce 17 species) can be a result of anatomical differences and distinguished compounds of the wood species. After 24, respectively 36 weeks of exposure the frequent occurrance of basidiomycetous yeasts (Cryptococcus albidus, Rhodotorula mucilaginosa), blue stain fungi (Aureobasidium pullulans, Hormonema dematioides), Epicoccum nigrum, Alternaria alternata and Phoma species was noted.
R Gründlinger, O Janotta, H Melzer, K Messner


Translation of titles of papers listed in Document No: IRG/WP/311
1972 - IRG/WP 312
BAVENDAMM W and W EHLERS: Investigation under conditions similar to those obtained in practice on the impregnation of structural timber by means of brushing and spraying. Holz als Roh- und Werkstoff, 12 (1954) 183 185. BAVENDAMM W and H ANOZYKOWSKI: Investigations under conditions similar to those obtained in practice on the impregnation of structural timber by means of short period dipping and open tank treatment. Holz als Roh- und Werkstoff, 14 (1956) 218 222. BAVEDAMM W: The absorption of preservative by structural timber using manual methods, Holzschutz im Bauwesen, Berlin, W Ernst and Son (1957). BAVENDAMM W and H WILLEITNER: Investigations on the practical application of the bored holes method for the impregnation of structural timber, Holz als Roh- und Werkstoff, 15 (1957) 411 416. BAVENDAMM W and W SCZESNY: Investigations on the practical application of the hot-and-cold open tank process for the impregnation of structural wood, Holz als Roh-und Werkstoff, 15 (1957) 381 384. BAVENDAMM W and U SIUTS: Investigations on the practical application of the bored holes pressure method for the impregnation of structural timber, Holz als Roh- und Werkstoff, 16 (1958) 430 435. BAVENDAMM W and W SCHNEIDER: Investigations on the practical application by brush and open tank for the impregnation of structural timber with bifluorides, Holz als Roh- und Werkstoff, 17 (1959) 284 291. BAVENDAMM W, H WILLEITNER and P KAUNE: Experiments on the treatability of pine and spruce of different cross-sections, Holz als Roh- und Werkstoff, 23 (1965) 363 368.
Anonymous


A study on insect pests and preservation of fire-damaged timbers in Da Xing An Ling forest region
1991 - IRG/WP 1499
Investigated insect pest of timbers of Da Xing An Ling forest region by means of sampling inspection. Meanwhile we had researched insects pest situation, regularity occurred and biological nature for fire damaged timbers attacked in the log yard. The results showed that the mainly insect species are small black-marmorated longicorn (Monochamus sutor L). We had eagaged in various small tests of timber preservation such as: underwater storage, brushing, spraying and fumigation. The results showed that the fumigant treatment was successful. By means of medium-sized tests of fumigant treatment many times. We had obtained the ideal fumigant and the amount of treatment as well as period of treatment.
Lu Wenda, Li Jian, Shao Jing Wen, Liu Yixing, Cui Yongzhi