Your search resulted in 67 documents. Displaying 25 entries per page.
Determination of fungitoxic value of preservatives in laboratory wood-block tests. Part 1: Standard procedures
1989 - IRG/WP 2326
By applying a modified agar-block method, a comparative analysis was made on the toxic value of the wood preservative CCA against the test fungus Serpula lacrymans. The procedure applied to determine the results accounted for different standards: EN (Toxic limit), ASTM (threshold retention), GOST (threshold retention and protection probability), PN (toxic doses) and JIS (value of efficiency). Desp...
J Wazny, J D Thornton
Animal blood protein as a component of new, non-toxic wood preservatives fixing organic active compounds in wood
2003 - IRG/WP 03-30312
Application of natural organic compounds and simple physico-chemical treatments in wood conservation has, as its objective, not only its protection against biological agents but, equally importantly, protection of natural environment by gradual abandonment of toxic constituents still applied commonly on a wide scale. The introduction into wood of new, non-toxic impregnation agents manufactured on ...
B Mazela, I Polus
Screening of bacteria, yeasts and Trichoderma isolates for antagonism toward stain and mould fungi on agar media and wood
1999 - IRG/WP 99-20159
A screening programme of soil bacteria for antagonism toward mould and wood stain fungi was undertaken on 8 types of agar-based media by application of several bacteria to each plate. The rapid screening method was subsequently verified by testing antagonism of the most promising bacteria on Scots pine sapwood. Most of the 64 bacterial showed antagonistic effects on certain media against individua...
C Payne, A Bruce
Chemostimulatory and chemotropic responses by fungi to preserved and unpreserved wood
1981 - IRG/WP 1134
During experiments to determine the presence of biotic connections between soil and wood at this laboratory, marked chemotropic responses to wood were demonstrated by some wood destroying micro-organism in agar culture. These were shown at some distance from bait, up to 35 mm away, and on some occasions were unaffected by the presence of toxic materials. This paper provides preliminary data on the...
G Mowe, B King
A comparison of fungal strains used in the bioassay of wood preservatives
1984 - IRG/WP 2220
Previously published data are presented relating to a number of strains of wood-destroying basidiomycetes (Coniophora puteana, Coriolus versicolor, Gloeophyllum abietinum, Gloeophyllum sepiarium, Gloeophyllum trabeum, Lentinus lepideus, Poria placenta, Fibroporia vaillantii and Serpula lacrymans) commonly used as test fungi in the bioassay of wood preservatives. The data, which has not been statis...
J Wazny, H Greaves
Preliminary agar screening studies as the first stage in the development of a biological control system against basidiomycetes in ground contact situations
1995 - IRG/WP 95-10111
Preliminary screening of Trichoderma isolates as possible biocontrol agents for protection of wood in ground contact situations against basidiomycete decay was undertaken on three types of media. Media used were 3% malt extract agar (MEA); a low nutrient synthetic media with a carbon: nitrogen ratio typical of that found in softwoods (LNM); and a similar synthetic media where the amino acid profil...
E J B Tucker, A Bruce
Utilisation of carbohydrates by stain fungi in agar culture
1998 - IRG/WP 98-10248
Stain fungi are often defined by their ability to utilise the starch and free sugars found in ray parenchyma cells, and their inability to utilise other wood constituents. However, several species of stain fungi produce bore holes in wood cell walls. This suggests that enzymatic activity capable of degrading structural polysaccharides and/or lignin is associated with the growth of the appressorium...
J Snow, P Vinden, S M Read
Accelerated testing for out of ground contact using natural biological preconditioning: Part 2
1997 - IRG/WP 97-20108
Small blocks of scots pine sapwood were treated, buried in vermiculite and exposed to natural microbial colonisation during outdoor exposure prior to laboratory decay testing. An EN 84-type leach trial was carried out on unexposed samples. Periodic microbial isolations, moisture content, permeability and weight loss tests were also conducted. The experiment ran for 12 months. The colonisation of t...
S Molnar, D J Dickinson, R J Murphy
Antagonistic effects of Dacrymyces stillatus against growth of other fungi
1991 - IRG/WP 2363
The antagonistic effects in dual cultures on malt extract agar of 5 wood decay fungi and the antagonistic effects of Dacrymyces stillatus against 1 mould fungus and 1 blue stain fungus were determined. Dacrymyces stillatus was the only fungus which exhibited clear antagonistic effects. The effects of Dacrymyces stillatus against the different test fungi varied however to a great extent. Dacrymyces...
J Bjurman
Alkyl dimethyl benzyl ammonium chloride: toxicity to Coniophora puteana when formulated in water and organic solvent
1986 - IRG/WP 2250
Results from agar block tests using Coniophora puteana demonstrate that the biological activity of alkyl dimethyl benzyl ammonium chloride is affected by the nature of the carrier solvent in which it is applied. In contrast to some earlier work, an alkyl ammonium compound in organic solvent formulation was identified that had significantly greater activity than its aqueous equivalent. A simple sol...
D P Blow
Laboratory methods for assessing the resistance of wood plastic composites to fungal attack.
2006 - IRG/WP 06-20340
Wood plastic composites (WPC’s) have many attractive material features including dimensional stability and resistance to moisture, but the wood in these materials remains susceptible to fungal attack. Assessing WPC decay resistance in laboratory trials has proven difficult because the slow moisture sorption characteristics of this material do not allow for sufficient fungal attack over the trad...
J J Morrell
Standard Test Methods for Wood Preservatives by Laboratory Agar-Block Test
2006 - IRG/WP 06-20350
Wood is one of the most valuable and versatile resources for all sorts of constructional purposes. But timber in its various forms is subjected to several types of deterioration. This standard lays down the method for the laboratory determination of threshold value of wood preservatives against fungi. Most chemicals are initially tested for their ability to control decay fungi in agar-block tests....
P K Sarker, M A Rahman, M R Bulbul, T Das, G N M Ilias
Current state of world standardization in the toxicometric methods for testing of wood preservatives
2007 - IRG/WP 07-20354
The paper presents an outline of the history of forming standardized toxicometric methods for testing of wood preservatives in the world during last 100 years. Numerous studies resulted in three main methods which are currently used for official and basis assessment of biocides:
- agar-block method in Europe (EN 113);
- soil-block method in the USA and Pacific countries (ASTM D 1413);
- modifi...
J Wazny
Interaction between Aspergillus niger fungus and other filamentous fungi on salt-agar medium and their growth on natural wood and wood treated with fungicide
2015 - IRG/WP 15-20569
Aspergillus niger (An) is very often used alone or in mixture with other filamentous fungi of the genus in testing biocides in disinfection procedures, safety, hygiene, medical fields as well as for testing resistance of wood and wood-based materials to moulds. Softwood species as well as hardwood are overgrown with An fungus very easily, causing drop of mainly the aesthetic value of wood product....
A Fojutowski, A Kropacz, A Koziróg
Activity of Two Strobilurin Fungicides Against Three Species of Decay Fungi in Agar Plate Tests
2017 - IRG/WP 17-30704
The objective of this study was to examine the toxicity of strobilurin fungicides against wood decay fungi in order to assess their potential to act as a co-biocide for copper-based wood protection. Two strobilurin fungicides, Heritage (50% azoxystrobin active ingredient) and Insignia (20% pyraclostrobin active ingredients), and copper sulfate pentahydrate were tested against one white rot fungus...
J D Tang, T Ciaramitaro, M Tomaso-Peterson, S V Diehl
Agar block durability test of plywood made of neem (Azadiracta indica) leaves treated veneer using two white rot fungi
2017 - IRG/WP 17-40782
This study has been undertaken to investigate the durability of plywood made from non-durable wood (simul, Bombax ceiba) veneer treated by neem (Azadiracta indica, A. Juss.) leaves. The veneers were treated with cold and hot water solution of neem leaves of different concentrations (10%, 5%, 2.5%) and treatment durations (1, 2, 3 days) for cold water and 20, 40 and 60 minutes for hot water. The pl...
K Akhter, M A Hashem, S Akhter
Development of accelerated decay test for CLT using a fungus grown on agar medium
2019 - IRG/WP 19-20664
CLT is a large-scale wooden board which consists of several layers of sawn lumber stacked in altering directions. Therefore, a lot of large cross sections appear on all narrow faces of CLT. As water penetrates easily into timber from cross section, wooden material whose cross section is exposed to water in in a usage environment is susceptible to deterioration by organisms. Wood deterioration orga...
T Miyauchi, K Kambara, W Ohmura, T Mori, H Matsunaga, N Hattori