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WOOD BORING WEEVILS - Pentarthrum huttoni, Euophryum confine

Timbers attacked

Any wood that is decayed.

Damage

Tunnels run along the grain just below surface, often exposed. Coarse bore dust, 'gritty' feel.
Emergence holes are round but with ragged edges. Damage caused by both larvae and adults, both of which may be found in infested wood.

Life cycle (7-9 months)

i. Adult: Live up to 16 months and feed on wood with larvae
ii. Eggs: White, laid on or just below surface
iii. Larva: Curved shape, white. Bore extensively along grain. Present for 8-9 months
iv. Pupa: Develops just below surface

Notes

Where weevil damage occurs it is a secondary problem; fungal decay is the primary concern.