Insect

Plaster Beetle

Cartodere constricta

Low Risk

Biology

Cartodere constricta is a minute brown scavenger beetle 1–2 mm long with an elongate ridged body. It feeds exclusively on moulds and mildew, completing development in a few weeks under damp conditions.

Behaviour

It appears in newly built or water-damaged buildings where plaster, drywall, and framing remain damp enough to support mould. Adults wander onto windowsills and light fixtures in large numbers.

Habits

Mass appearances indicate hidden moisture: leaking pipes, condensation in wall voids, flood residue, or unseasoned lumber. Populations collapse once the substrate dries out.

Control methods

1Find and repair the underlying moisture or leak source
2Dry affected voids with dehumidifiers and forced ventilation
3Remove and replace mould-damaged drywall and insulation
4Improve crawlspace ventilation and add a vapour barrier
5Vacuum visible beetles from sills and fixtures
6Avoid insecticides; drying the structure ends the infestation

Tailored to Plaster Beetle

IPM Procedure Checklist

View full procedure

Step 1

Inspection

Inspect harborage near food, water and warmth
Check cracks, voids and appliance interiors
Place sticky monitors at suspected hot-spots

Step 2

Identification

Confirm Plaster Beetle (Cartodere constricta) — not a look-alike
Note life stage and risk level: Low
Capture clear photos and samples for the record

Step 3

Action Thresholds

Tolerate low-level activity outside sensitive zones
Act if activity moves indoors or near food
Review threshold seasonally with the client

Step 4

Prevention

Seal cracks, plumbing penetrations and wall voids
Eliminate moisture sources and standing water
Improve sanitation: sealed food storage, grease removal

Step 5

Control Methods

Find and repair the underlying moisture or leak source
Dry affected voids with dehumidifiers and forced ventilation
Remove and replace mould-damaged drywall and insulation
Improve crawlspace ventilation and add a vapour barrier

Step 6

Monitoring & Evaluation

Service monitors on schedule and trend captures
Re-inspect for Plaster Beetle activity at follow-up
Adjust tactics based on data; report findings to client