4b4845dc_imber_Surveys___Causes_of_Damp__Tunnels
[Common Name] Powder post beetle [Latin Name] Lyctus Brunneus [Type] Small insect [Wood Targeted] Sapwood of wide pored Hardwood e.g. Oak, >3% starch [Spreads] Flight, only to <10 year old timbers [Damage to wood] Severe tunnelling, mainly along grain to start, surface left [Frass (bore dust)] Lots of frass can be shaken out, smooth flour like [Emergence holes] 1~2mm [Tunnels] 
Round, joining tunnels, along grain to start
Aquarius Timber Preservation | Damp Timber Surveys | Causes of Damp
Tunnels