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SECTION 1: Wood-Destroying Organisms – Inspection and Identification
Questions in this section assess knowledge of subterranean termites, drywood
termites, dampwood termites, carpenter ants, powderpost beetles, old house borers,
wood decay fungi, damage patterns, infestation signs, inspection techniques, moisture
conditions, and proper identification.
Question 1
A technician observes mud tubes on a basement foundation wall. The tubes are
approximately 1/4 to 1/2 inch wide, constructed of soil and fecal material, and contain
live insects with beaded antennae and broad waists. What organism is responsible?
A. Carpenter ants
B. Drywood termites
C. Subterranean termites
D. Old house borers
Correct Answer: C
Rationale: Subterranean termites construct mud tubes from soil, fecal material, and
saliva to maintain moisture while traveling between soil and wood. Beaded antennae
and broad waists are characteristic of termites. Carpenter ants have elbowed antennae
and narrow waists and do not build mud tubes. Drywood termites do not require soil
contact and do not build mud tubes. Old house borers are beetles that do not construct
mud tubes.
,Question 2
Drywood termite swarmers are most likely distinguished from subterranean termite
swarmers by which characteristic?
A. Drywood swarmers have wings of unequal length
B. Drywood swarmers do not require soil contact and may emerge directly from wood
C. Drywood swarmers are always black in color
D. Drywood swarmers are smaller than 1/16 inch
Correct Answer: B
Rationale: Drywood termites infest dry wood and do not require soil contact; swarmers
emerge directly from infested wood. Both drywood and subterranean swarmers have
two pairs of equal-length wings. Color and size are not reliable distinguishing
characteristics.
Question 3
A technician finds wood damage in a crawlspace. The galleries are smooth and clean
with no soil present, and sawdust-like frass is scattered on the ground below. No
insects are visible. What is the most likely cause?
A. Subterranean termites
B. Drywood termites
C. Carpenter ants
D. Powderpost beetles
Correct Answer: C
Rationale: Carpenter ant galleries are smooth and clean (not soil-lined), and they expel
sawdust-like frass. Subterranean termite galleries contain soil. Drywood termite frass
consists of distinct, six-sided pellets. Powderpost beetle frass is fine and powdery, and
exit holes are present.
Question 4
, A technician finds fine, talcum-powder-like frass and small round exit holes
approximately 1/32 to 1/8 inch in diameter in hardwood flooring. What is the likely pest?
A. Old house borer
B. Powderpost beetle
C. Carpenter ant
D. Subterranean termite
Correct Answer: B
Rationale: Powderpost beetles infest hardwoods and produce fine, powdery frass along
with small round exit holes. Old house borers produce coarser frass and larger oval exit
holes (1/4 to 3/8 inch). Carpenter ants produce sawdust-like frass. Subterranean
termites do not create exit holes or powdery frass.
Question 5
A technician observes wood in a crawlspace that is dark brown, shrunken, and cracked
into cubical pieces. The wood breaks easily along these cracks. What type of decay is
present?
A. White rot
B. Brown rot
C. Soft rot
D. Dry rot
Correct Answer: B
Rationale: Brown rot fungi break down cellulose, leaving lignin, which causes wood to
turn brown, shrink, and crack into cubical pieces. White rot causes wood to become
fibrous and lighter in color. Soft rot causes gradual softening without characteristic
cubical cracking. Dry rot is a misnomer for certain brown rot fungi, but the specific
symptoms described indicate brown rot.
Question 6