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 Shape and site
Appearance of
(inches) of
Wood
Condition of
Insect
Frass in
Type
exit/entry hole
Reinfest
Wood Attacked
Tunnels
Type
no
Round 1/50-1/8
ambrosia beetles
softwood & hardwood
unseasoned
none present
logs and lumber
Round 1/32-1/16
hardwood
lyctid beetles
newly seasoned fine, flour-like,
yes
loosely packed
Round or
softwood & hardwood
curculionids snout
slightly damp,
very fine powder and
yes
elongate
decayed
beetles or wood
tiny pellets, tightly
1/16-1/12
boring weevil
packed
no
bark or engraver
bark/sapwood interface
unseasoned
Round 1/16-3/32
fine to coarse, bark
softwood & hardwood
under bark only colored, tightly packed beetles
softwood & hardwood
Round 1/16-1/8
seasoned
fine powder and pellets, anobiid beetles
yes
loosely packed (pellets
may be absent and frass
tightly packed in sane
rarely
bostrichid beetles
Round 3/32-9/32
softwood & hardwood
seasoning and
fine to coarse powder,
newly seasoned
tightly packed
(bamboo)
Round-oval
long-horned beetles
no
softwood & hardwood
unseasoned
coarse to fibrous,
1/8-3/8
or round-headed borers
logs and lumber mostly absent
Oval 1/4-3/8
softwood
seasoning to
very fine powder & tiny cerambycids or
yes
seasoned
pellets, tightly packed old house borers
no
buprestids or
Oval 1/8-1/2
softwood & hardwood
seasoning
sawdust-like, tightly
flat-headed borers
packed
carpenter bee
Round 1/2
softwood
seasoned
yes
none present
unseasoned logs absent or sawdust-like, round or flat-headed
Flat oval 1/2
softwood & hardwood
no
borer, wood machined
or more or irregular
and lumber or
coarse to fibrous;
after attack
surface groove
seasoning
tightly packed
1/8-1/2 wide
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