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Typical signs of infestation
One or two beetles
found in your house, do not necessarily indicate an active infestation. They may
come from outside. It is not often that a homeowner actually finds adult old
house borers in a structure. |
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Sounds
The clicking or
rasping
sound
of the larvae feeding with wood can be heard from infested timbers, especially
during spring and summer months when temperatures are high. That annoying voice
can be heard through all year within closed heated rooms. |
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Exit holes
Old house borers
leave an oval exit hole (0.6 - 1 cm), often with ragged edges. Powderpost
beetles normally leave smaller round exit holes (0.1 - 1 cm). The presence of
emergence holes indicates that some beetles completed their life cycle in the
wood. Exit holes provide hints about the type of beetle and current activity.
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Frass
Frass looks like
fine sawdust. It is usually packed together with excrement inside timbers. If
wood is infested, pale-coloured frass of active larvae may fall from the exit
holes, forming small piles on the surface below the wood. If frass piles are
swept away and more appear in a week or more, the infestation is still active.
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