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Field trials of groundline remedial treatments on soft rot attacked CCA treated Eucalyptus poles
1983 - IRG/WP 3222
A total of 17 CCA treated Eucalyptus poles, which were found to contain 2-5 mm of soft rot in October, 1980, were reinspected in October, 1982. In 1980, 11 of the poles were given a supplemental groundline bandage treatment of either Osmoplastic or Patox, while 6 of the poles were designated as untreated controls. Two years after remedial treatment, samples were removed from the poles for microscopic observations and for chemical retention analysis. It was found that the remedial bandage treatments were effective in preventing any further advance of soft rot. Based on the positive results of this study, a treatment efficacy of five years or longer is predicted.
W S McNamara, R J Ziobro, J F Triana


Evaluation of teak sawdayst Tectona grandis L Fil as a potential source to obtain a natural wood preservative in Colombia
2004 - IRG/WP 04-30356
Plantation Teak (Tectona grandis L. Fil) has been tested as a possible source of natural wood preservatives due to the known excellent durability of old-growth teak wood. Field tests (ground proximity termite and above ground simulated decking exposures) were established in Colombia in April 2003 at two different test sites with different climates (Tropical Dry and Rain forest). Teak heartwood extracts were obtained using Soxhlet extraction with chloroform-methanol and methanol-ethanol as solvents, for two different mixtures at three different concentrations. Sapwood stakes of Patula pine (Pinus patula) and Globulos eucalyptus (Eucalyptus globulus) were vacuum pressure impregnated with these extracts, and control stakes were impregnated with CCA Type C and ACQ Type D at two nominal retentions (1 and 4kg/m3). The test sites have been found to be very active for both decay and termites. After only 9 months exposure termite attack has been observed from four species (Nasutitermes, Heterotermes, Triangularitermes, Velocitermes), and several basidiomycetes fungi have also been isolated from the test samples (Trametes, Schisophyllum, Poria). The results show that up to 100% of the samples have been subject to fungal attack, although in most samples only superficial trace attack has occurred in the exposure period. In contrast, termite attack has been rapid, primarily on the eucalyptus samples, which are suffering substantial degradation.
A Castillo, Y Cabrera, A F Preston, R Morris


Termites y otros insectos xiliofagos en bienes arquitectonicos monumentos nacionalos de Colombia
2009 - IRG/WP 08-10679
The incidence of termites and other wood destroying insects was surveyed in ten historical buildings in Colombia. The most common insects were termites (Kalotermes, Cryptotermes, Heterotermes), although numerous decay organisms were also detected, including beetles (Anobium, Lyctus, Cerambycids) and various wood decaying fungi. Structural wood elements were classified according to the degree of attack using a qualitative scale. All of the surveyed buildings showed some degree of attack in structural wood elements. The most affected elements were found in buildings located in humid and warm climates; however we also observed insects outside their ecological niches (for example termites in Bogota at 2640 m.a.s.l). The microclimate inside the building may help some insects to survive. The results suggest that most of the historical buildings need constant inspection and maintenance actions to reduce the incidence of wood-destroying.
M G Ramírez


Field testing in Colombia: Three years of evaluations and experiences
2008 - IRG/WP 08-20394
Two field test sites have been established in Colombia for the evaluation of fungal and termite resistance of treated wood. The combination of elevated temperature, high and stable humidity and high rainfall at the two test sites accelerates microbial and insect activity (Scheffer, 1971; Thornton et al, 1994; Freitag et al, 1995). Tests established include above ground termite tests, ground contact stake tests, above ground proximity decay tests, and above ground sandwich decay tests. The reasons for site selection are discussed. Selected results and experiences are presented as well as information on the utility and value of the various test methods.
Y Cabrera, A Preston


Performance of dip and pressure treated wood in termite ground proximity exposures in Hilo, HI, and Colombia
2008 - IRG/WP 08-30491
A number of preservative systems were evaluated for their ability to control termite attack when applied as both dip and pressure treatments. With dip treatments, better performance was observed with southern pine than spruce-pine-fir using the same solution strength treatment, probably as a result of the about 50% greater uptake with southern pine and associated deeper preservative penetration. Boards that were cross-cut after treatment suffered much great attack, suggesting that the shell treatment does not provide any protection to post treatment cut ends. There were also indications that the type of cover used in the termite ground proximity test may greatly influence the activity of the termites in the arrays.
P Walcheski, A Zahora