AMBROSIA or PINWORM BEETLE (Scolytidae Fig.1 and Platypodidae Fig.2)
Description
These insects are forest pests which can only attack standing trees or wet logs. They attack both softwoods and hardwoods and the adult beetles bore into the wet timber feeding upon a mould fungus which grows on the damp tunnel walls. As the timber dries out and conversion takes place the fungus ceases to grow and the insects starve to death.
Recognition
Occasionally the damage caused by these insects can be seen in timbers used for joinery or structural work in houses.
The damage can be recognised by the clean-cut circular holes, which can vary in diameter form 0.5-3mm according to species of beetle, and sections of usually dark stained tunnels, free of bore dust running mainly across the grain (Fig.3). The adult beetles are rarely seen.
Dried timber showing these holes can be safely used with the knowledge that there is not risk of any spread of attack to other timbers. The presence of these holes in scattered groups would have no significant effect upon the strength of the timber for structural use. The only problem is where there are sufficient numbers to affect the appearance when clear coatings are used, but present no problems under painted surfaces when filled.
Remedial treatment
No treatment necessary as these insects die out in dried timber.
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