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Signs of EHB
The most obvious signs of EHB are:
- Adult beetles are brownish-black and may have white patches on their back. Behind the head there are two raised, black, shiny knobs. Adults are about 1-2cm long with antennae about half that length.
- Larvae (grubs) in tunnels or galleries in the wood are a creamy white colour with a rippled body and enlarged head. Larvae can grow up to 4cm in length.
- Frass, a mixture of wood dust and droppings, can sometimes be found on the floor below infested timber where adult beetles have emerged from holes.
- Boring larvae eat tunnels through the timber which are frequently tightly packed with frass. These galleries rarely break through the timber surface and are seldom detected; however, long blister-like swellings under the surface may be evident.
- Soft scraping sounds may be heard as the borer eats through the timber. Galleries (tunnels) and larvae may be evident in untreated pine timber that has been planed, sawn, or split.
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