Stored Product Pest
White-marked Spider Beetle
Ptinus fur
Biology
A 2–4 mm brown beetle with a globular humped abdomen, long legs and long antennae that give it a spider-like outline; females carry two patches of white hair on the elytra. It is long-lived and slow-breeding, with one or two generations a year.
Behaviour
A scavenger that feeds on almost any dried organic debris — spilled grain, rodent droppings, dead insects, wool, feathers and old stored food. It is nocturnal, hides by day and plays dead when disturbed, so it is usually found by trapping rather than by sight.
Habits
Typical of neglected areas: attics, wall voids, old bird and rodent nests, museum collections and disused storerooms. Its presence often points to a hidden dead animal or nest rather than to the visible food stock. Cool damp conditions suit it well.
Control methods
- 1Locate and remove hidden bird or rodent nests and carcasses
- 2Vacuum debris from attics, voids and floor cracks
- 3Discard long-stored dried goods and old collections material
- 4Use sticky traps along walls to map the source
- 5Reduce humidity in storage areas
- 6Screen vents and seal entry points to lofts
- 7Treat voids with a labelled residual after cleanout
Tailored to White-marked Spider Beetle
IPM Procedure Checklist
Inspection
- Inspect grain, spices, pet food and dry goods for larvae and webbing
- Deploy pheromone monitors near storage and shelving
- Check spillage in seams, cracks and shelf liners
Identification
- Confirm White-marked Spider Beetle (Ptinus fur) — not a look-alike
- Note life stage and risk level: Low
- Capture clear photos and samples for the record
Action Thresholds
- Tolerate low-level activity outside sensitive zones
- Act if activity moves indoors or near food
- Review threshold seasonally with the client
Prevention
- Rotate stock FIFO; reject damaged packaging at receiving
- Store products in airtight containers
- Maintain low humidity and clean storage surfaces
Control Methods
- Locate and remove hidden bird or rodent nests and carcasses
- Vacuum debris from attics, voids and floor cracks
- Discard long-stored dried goods and old collections material
- Use sticky traps along walls to map the source
Monitoring & Evaluation
- Service monitors on schedule and trend captures
- Re-inspect for White-marked Spider Beetle activity at follow-up
- Adjust tactics based on data; report findings to client