Your search resulted in 12 documents.
Termite resistance of Malaysian and exotic woods with plantation potential: Laboratory evaluation
1998 - IRG/WP 98-10280
The resistance of selected Malaysian woods to attack by the representative aggressive subterranean termite Coptotermes formosanus Shiraki (Isoptera: Rhinotermitidae) was evaluated in four-week, no-choice laboratory tests. This is part of an ongoing effort between the Forest Research Institute Malaysia and the University of Hawaii to document the termite resistance of Malaysian timber species of potential value in plantation forestry. Several of these tree genera also occur in Hawaii, or could potentially be of value as well in forestry efforts in the Hawaiian islands. Species included in the present report are: acacia (Acacia mangium), batai (Albizia falcataria), casuarina pine (Casuarina equisetifolia), Araucarian pine (Araucaria cunninghamii), sentang (Azadirachta excelsa), both Malaysian-grown and Burmese-grown teak (Tectona grandis), kempas (Koompassia malaccensis), tualang (Koompassia excelsa), Caribbean pine (Pinus caribaea), Scots pine (Pinus sylvestris), and rubberwood (Hevea brasiliensis). Of these, Burmese teak, kempas, tualang, and casuarina pine proved most resistant to termite attack. Malaysian teak and sentang demonstrated somewhat less, but still significant termite resistance. Sentang is a relatively pest-free tree of interest for plantation forestry, and was also quite toxic to termites. The remaining tree species were very susceptible to termite attack, and would require protection in the field and treatment of the resulting wood products. Correlation of these laboratory results with data from field studies in Malaysia will provide a comprehensive profile of the termite resistance of these timbers.
J K Grace, A A H Wong, C H M Tome
Preliminary results of investigations on screening test of chemical compounds suitable for the preservation of lignocellulosic materials against biodeterioration
1976 - IRG/WP 262
This paper investigates the possibilities of reducing the time needed for the determination of the effectiveness of chemical compounds from the point of view of their eventual application to lignocellulosic materials for preservation against decay and soft-rot.
K Lutomski, S S Neyman
Soft rot test of copper/chrome/arsenic treated heartwood of three Malaysian timbers
1991 - IRG/WP 2381
Standardized heartwood blocks of kempas (Koompassia malaccensis), keruing (Dipterocarpus sp.) and tualang (Koompassia excelsa) were impregnated with 0 to 6.3% (w/v) CCA and challenged to decay by a mixed inocula of Chaetomium globosum, Glenospora graphii, Humicola grisea, Petriella setifera and Trichurus spiralis in a containerized vermiculite-burial decay system according to draft CEN/TC 38 WG 4. A similar burial test using unsterile garden soil was included for comparison. The results of a preliminary assessment of a 12 w experiment were recorded (IRG/WP/2354). Due to low mass losses and final block moisture contents after the standard 12 w incubation, the experiments were resumed with the same samples and the above outlined culture conditions. Untreated European beech wood (Fagus sylvatica L.) was included as reference species. The experiments continued until beech samples reached 25% mass loss in soil-burial test (36 w). Final results are presented and the adaptation of draft EN soft rot test for treated tropical hardwoods are discussed.
A H H Wong, R-D Peek
Alternative timbers to Iroko (Milicia excelsa) for various end-uses: Ghana’s offer
2004 - IRG/WP 04-10518
There are hundreds of timber species indigenous to Ghana and several exotic species have been extensively planted. The timber industry in Ghana is very important to the country’s economy. Despite its small size relative to the world trade in timber products, it has the potential to be a driving force in the development of the Ghanaian economy. The industry is currently going through a period of change and restructuring which is largely brought about by the need to address the issues of a reducing resource and to use the available resource more efficiently and to greater economic benefit by promoting the lesser used species as alternatives to the over-exploited primary species and also by developing the tertiary processing sector. Iroko (Milicia excelsa) is one of the primary species currently facing extinction and Dahoma (Piptadanistrum africanus), Ekki (Lophira elata), Kusia (Nauclea diderrichii) and Papao (Afzelia bella) are lesser-used species being promoted as good alternatives to Iroko for various end uses. Properties (mechanical, biological) and volumes of these species are compared to those of Iroko.
S A Amartey, Zeen Huang, A Attah
The comparative resistance to fungi of the wood munika (Pinus heldreichii Christ.), fir (Abies alba Mill.) and spruce (Picea excelsa Poir.) compared with Pinus sylvestris L. and some physical and mechanical characteristics of munika
1981 - IRG/WP 1129
The munika (Pinus heldreichii Christ.) is situated primarily in the Balkans, and partially in the south of the Apenine peninsula. As an endemic species, with a very little annual increment, it has not been used enough as a timber for mechanical conversion up till now, although the oldest trees can grow to 27 m in height, with a diameter at breast height of about 60 cm. According to data of many Balkan authors, the wood of munika can be classified as a very durable wood and resistant against almost every damaging factor, because some objects, which had been made from munika heartwood, have been in use for almost 300 years. During our research on the comparative resistance to fungi of munika wood, which was performed according to the Yugoslavian standard (JUS D A1.058), it was concluded that: -- against Serpula lacrymans, the sapwood of munika was more resistant than Scots pine (Pinus sylvestris) sapwood, because the weight loss after four months, was less in the first instance (16.7% : 20%). The heartwood of munika was practically fully resistant (the weight loss was only 0.6%). -- against Coniophora puteana, the sapwood of munika had less resistance than Scots pine sapwood (the ratio of the weight losses was 39.6% : 22.4%), while the munika heartwood was also fully resistant (weight loss was 0.7%). -- comparing munika sapwood's resistance to the above-mentioned fungi, it is obvious that Coniophora puteana: can destroy it easier and faster. It follows also that it has a different comparative resistance than that of Scots pine sapwood. Against Serpula lacrymans it had about 76.8% less activity. -- the heartwood of munika was much more resistant to the test fungi, what can be seen from the percentage weight loss. Contrasted with Scots pine heartwood, the resistance of munika heartwood to Serpula lacrymans according to weight loss was about 10 times greater, and Coniophora puteana about 6.7 times greater. -- the resistance of munika heartwood compared to Scots pine heart wood, under the activity of the above-mentioned fungi was greater for approximately the same percentages 89.8% and 85.0%. From these results, we can conclude that the heartwood of munika is very resistant against the decay fungi (although this is not the case with its sapwood), and this is why this species can be classified in the group of the most resistant wood species. The research showed that the aforesaid characteristics were the result of the wood containing resin materials and aromatic oils. Its resistance to fungi, as well as data about certain physical and mechanical properties, primarily of its heartwood, have proved discoveries that munika can last as long as 200 years and in some specific instances for over 300 years.
M Petrovic, M Miric
The treatability of five Indonesian wood species with BFCA preservative
1987 - IRG/WP 3428
This paper deals with a preliminary study on the treatability of five Indonesian wood species, i.e. Altingia excelsa (AE), Rhodoleria teysmanii (CA), Litsea odorivera (LO), Schima wallichii (SW) and Cratoxylon arborescens (CA). Wood samples measuring 4 x 4 x 100 cm³ were dipped into BFCA preservative solution for about 30 seconds. Preservative penetration and the surface area of treated zone were observed after 2, 4 and 6 weeks diffusion storage. The results reveal that the average preservative penetration for CA, LO, SW, AE and RT are respectively 14.32 mm, 7.83 mm, 6.82 mm, 6.59 mm and 5.22 mm.
Nana Supriana, T K Waluyo
An aquaria test of the natural resistance against marine borers of some commercial timbers available in Australia
1996 - IRG/WP 96-10145
The natural resistance of the heartwood of 22 different timbers grown or commercially available in Australia was examined. Radiata pine sapwood both untreated, and treated with 5.4 kg/m³ CCA salt, was included for comparison. Small timber blocks were exposed for one year in tanks containing either Limnoria tripunctata or Lyrodus pedicellatus. Four softwood species tested were heavily attacked and non resistant: radiata pine sapwood, Douglas fir, Huon pine and King William Pine. The latter two species are moderately durable in ground contact. Both white and black cypress pine were lightly attacked. Most hardwoods examined that are durable on land, also performed well in the aquaria, although none were immune from marine borer attack. Blocks in aquaria with Lyrodus pedicellatus were generally more decayed by marine microorganisms than blocks placed with Limnoria tripunctata. Limnoria is able to leave its burrow, and probably grazes on surface mycelia.
L J Cookson
Soft rot test of copper/chrome/arsenic treated heartwood of three Malaysian timbers by the vermiculite-burial method. (+ correction document of 25 July 1990)
1990 - IRG/WP 2354
Heartwood of copper-chrome-arsenic (CCA) treated kempas (Koompassia malaccensis), tualang (Koompassia excelsa) and keruing (Dipterocarpus spec.) was found to be susceptible to soft rot in recent pole surveys. Standardized heartwood blocks were impregnated with 0 to 6.3% (w/v) CCA and challenged to decay for twelve weeks by a mixed inocula of Chaetomium globosum, Glenospora graphii, Humicula grisea, Petriella setifera and Trichurus spiralis in containerized vermiculite-burial decay system. Fixation of CCA in wood immediately following impregnation took place by steaming (110°C, 1 h) or by slow drying (4 w), and half of both were leached (CEN 84). A similar burial test using soil was included for comparison. Average% mass loss (ML) in treated keruing was generally <3% with no clear differentiation among CAA levels, methods of fixation with or without leaching and decay methods. A relatively gradual-to-abrupt increase in resistance with higher levels of CCA was found for kempas and tualang, where average ML of the untreated samples for each combination of fixation/leaching was between 5 and 9% (inoculated vermiculite) or 3% (unsterile soil) with negligible decay at concentrations of about 2% CCA and above. The suitability of such soft rot tests with treated heartwood is discussed.
R-D Peek, A H H Wong
The influence of timber species and preservative treatment on spore germination of some wood-destroying Basidiomycetes
1988 - IRG/WP 2300
Basidiospores from six wood decay fungi exhibited varying germination rates on untreated softwood and hardwood blocks. Germination inhibition of all test fungi was recorded on pine sapwood. No preference for a certain timber species by a particular fungus was evident. Whereas almost complete inhibition of germination occurred on wood treated with a quarternary-ammonium based wood preservative, most fungi germinated successfully on wood treated with a boron based preservative. Further work is necessary to determine whether a reliable preservative screening using spore germination tests as criteria can be developed.
B M Hegarty, G Buchwald
Efficacy of Neem (Azadirachta indica) Leaves Against Wood Decay Fungi
2008 - IRG/WP 08-30450
Many plant-derived substances have fungitoxic, pecticidal and insecticidal ability. Neem leaves are very popular in this respect since the ancient time. The present study is to investigate the fungitoxic activities of neem leaves extractives against wood decay fungi. Three different solvents, i.e. acetone, methyl alcohol, ethyl alcohol, were used to isolate the extract of neem leaves. The extractives were then used to see the inhibition acitivity over the test fungi in laboratory and natural condition. Both results proved that 3% concentration of acetone extract is best for inhibiting the growth of test fungus. Acetone and methanolic extract was also effective against that decay fungus. From this investigation, it is established that neem extract is potential source of biological preservative of wood and it can be used in any wood related commercial purposes.
A Humayan Kabir, M A Rahman, M Firoz Alam
Quercetin - a potential compound of Azadirachta indica A. Juss. (Neem) leaves exhibiting activity against wood decaying fungi and termites
2008 - IRG/WP 08-30463
Azadirachta indica A.Juss. is widely recognized for its medicinal, insecticidal, pesticidal and anti-microbial property. Methanol extract of neem leaves revealed marked anti-fungal activity when subjected to malt-agar and soil block bioassay against wood destroying brown (Oligoporus placentus) and white rot (Trametes versicolor). The extract also revealed marked termicidal property when subjected to wood destroying termites i.e. Microcerotermes beesoni Synder in laboratory and against Odentotermes obesus Rambur in termite mound. Column chromatography of methanol extract resulted in isolation of compound exhibiting potential activity against fungi. The compound obtained was identified as flavanoid and structure elucidation was done by UV-Visible, IR, Mass, 1H & 13C NMR. The compound was identified as quercetin. It was further tested at 5µg concentration exhibiting 100% growth retardation of the test fungi.
S Dhyani, S Tripathi
Potenzy of Azadirachta indica heart wood extracts as wood bio-preservative against termite attack
2020 - IRG/WP 20-10972
Extractives in wood are one of the main reasons for wood resistance against bio-degradation. The chemical compositions of extractives from matured Azadirachta indica that are known to be very resistant against bio-degradation were studied to assess their role as wood preservative. Ethanol and toluene were used in the extraction of these compounds from the heartwood of Azadirahcta indica. Chemical analysis of the extracts was done using Gas Chromatography-Mass Spectrometry (GC-MS) after derivatization using N,O bis (trimethyl silyl) acetamide. The main groups of compounds identified from both extracts are fatty acids, hydrocarbons, sterols, sterol ketones, phenolics, sterol esters and waxes. The extracts obtained were used to treat sapwood of four different wood species that are known to be susceptible to bio-degradation at 12% (weight/weight) retention level. Treated samples were taken to timber graveyard for 12 months. It was observed that the extracts from Azadirachta indica used improved the resistance of these susceptible wood species to termite attack at the timber graveyard more than 70% when compared to the controls and also it was observed that removal of extractives from Azadirahcta indica significantly decreased their resistance to termite attack. Conclusively, the extractives from Azadirachta indica wood contribute greatly to the protection of susceptible wood species against termite attack.
L O Aguda, O B Olajide, O Y Aguda