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An infestation of woodworm is hard to spot at first glance, but there are some tell-tale signs. The most obvious is the tiny, miniscule holes in the woodwork: they’re easy enough to miss if you don’t look closely. These will be in an irregular pattern and clumped together. Around the holes you may also see what looks like sawdust: this is called frass and is the by-product of woodworm infestation.