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Arachnid
Harvestman
Leiobunum vittatum
Low Risk
Biology
Leiobunum vittatum is an opilionid, not a true spider. It has a single oval body segment and extremely long, thread-like legs. Adults are 3–5 mm in body length but much larger in leg span. They lack venom and silk glands entirely.
Behaviour
Harvestmen are nocturnal scavengers and opportunistic predators of small insects, mites, and decaying matter. They gather in damp, sheltered areas and are often seen in groups. They do not bite or sting and are harmless to people.
Habits
They become noticeable in basements, crawlspaces, garages, and gardens during late summer and fall. Their long legs and clustering behaviour can alarm residents, but they are incidental invaders that do not damage structures or fabrics.
Control methods
- 1Reduce humidity and improve ventilation in basements and crawlspaces
- 2Seal gaps around doors, windows, and foundations
- 3Remove leaf litter, mulch, and debris near the structure
- 4Vacuum or relocate individual harvestmen indoors
- 5No chemical treatment is usually necessary
- 6Educate occupants that they are harmless scavengers
Tailored to Harvestman
IPM Procedure Checklist
Step 1
Inspection
- Survey interior and exterior for evidence and conducive conditions
- Document findings with photos and a site map
- Place monitors to confirm activity
Step 2
Identification
- Confirm Harvestman (Leiobunum vittatum) — 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
- Exclude entry points and harborage
- Improve sanitation and moisture control
- Modify habitat around the structure
Step 5
Control Methods
- Reduce humidity and improve ventilation in basements and crawlspaces
- Seal gaps around doors, windows, and foundations
- Remove leaf litter, mulch, and debris near the structure
- Vacuum or relocate individual harvestmen indoors
Step 6
Monitoring & Evaluation
- Service monitors on schedule and trend captures
- Re-inspect for Harvestman activity at follow-up
- Adjust tactics based on data; report findings to client