Biodeterioration and hazard assessment of tipuana trees in the sidewalks of São Paulo, SP

Abstract:

In the sidewalks of São Paulo city, Brazil, 1109 tipuanas (Tipuana tipu)trees were evaluated for its biodeterioration process and hazard assessment, using biomechanical concepts. The tress were characterized taking into consideration the surroundings and target analysis, dendrometric variables and external and internal biodeterioration, using nondestructive equipment (resistograph) for the trunk prospection. The hazard assessment was estimated using a static structural model. The old aged trees did not show any sign of dieback, even though, the general aspect of their surroundings was critical by the inadequate places they were planted and inappropriate management and/or occurrence of injuries. The trees had their trunks deteriorate by xylophagous organims, mainly decaying fungi and subterranean termites, which affected the heartwood. The decaying fungi observed were classified as white rot and soft rot, being the white rot mores common in the heartwood of the trees. The infestation of the trees by the subteranean termite Coptotermes gestroi was at high levels, however, it was considered as a secondary plague-organism, because its attack was associated with the previously, decayed heartwood by Ganoderma sp or Pycnoporus sanguineus fungi. The structural model categorized 177 (16%) tipuanas as hazardous trees and its was observed statistical significance with the external presence of fungi and termites, DBH and internal biodeterioration processes.


Reference:
BRAZOLIN, Sérgio; TOMAZELLO FILHO, Mário; YOJO, Takashi; AMARAL, Raquel Dias de Aguiar Moraes. Biodeterioration and hazard assessment of tipuana trees in the sidewalks of São Paulo, SP. In: INTERNATIONAL NONDESTRUCTIVE TESTING AND EVALUATION OF WOOD SYMPOSIUM, 19., 2015, Rio de Janeiro. Proceedings… 6 p.  

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https://escriba.ipt.br/pdf_restrito/173596.pdf

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