Abstract
Five species of subterranean termites have damaged structural wood in the urban system. The damage in most cases was found to be maximum during winter and showed negative linear correlationships with the climatic factors. Step-down multiple regression analyses revealed that in rod-cement-concrete houses, rainfall showed a significant negative relationship with the overall damage, and temperature showed a similar relationship with the damage to door frames and panels. When the effect of rainfall is nullified, temperature showed a significant negative relationship with the damage on door frames and panels, while RH showed a similar relationship with the damage on door frames. With the nullity of the effects of temperature, and effects of both temperature and RH, rainfall showed a significant negative relationship with the total termite damage, while with the nullity of the effects of RH and rainfall, temperature showed a significant negative relationship with the termite damage to door panels. In tile-roof houses, rainfall showed a significant negative relationship with termite damage to rafters and a positive relationship with damage to the ceiling; temperature showed a significant negative relationship with damage to rafters and a positive relationship with the overall damage, and RH showed a significant negative relationship with the damage to rafters and joists. When the effect of rainfall is nullified, RH showed a significant negative relationship with the damage to joists and total termite damage. However, with the nullity of the effect of RH, temperature showed a significant positive relationship on the total termite damage. When the effects of both rainfall and temperature are nullified, RH showed a significant negative relationship with the damage to joists, while with the nullity of the effects of RH and rainfall, temperature showed a significant positive relationship with the total damage to the structure of wood in these houses.
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