Bait Station No Activity vs Feeding vs Relocate Decision Tree

Why this matters

A residential or commercial rodent program built on tamper-resistant bait stations relies on the stations reaching the foraging path of the target species. A station with no take at a 30-day check can mean three different things: there is no target population (good outcome), the station is in the wrong location (correctable), or the rodents are present and avoiding the station (a bigger problem that needs strategy change). Each branch points to a different next action and a different customer conversation. Walking the call as a single "no activity" type misses the species behavior and burns the next visit.

Symptom presentation

Pull the prior service ticket. Note the station locations placed, the bait active and formulation, the placement date, and any rodent evidence at the original visit. Confirm the species ID; house mice (Mus musculus), Norway rats (Rattus norvegicus), and roof rats (Rattus rattus) each have different foraging ranges and station-acceptance behaviors. House mice forage in a 10 to 30 foot radius and will accept new stations within days; Norway rats forage 100 to 150 feet and are neophobic, typically taking 7 to 14 days to accept a new object in the territory.

Walk the property and note current rodent evidence (fresh droppings, tracks, sightings, gnaw marks under UV). Activity on the property combined with no station feeding is the diagnostic anchor. No activity on the property and no station feeding is a success outcome, not a failure.

Quick checks on site

Inspect each station. A station that has been bumped, kicked, or dragged out of position is not in the location it was placed; the customer or property staff may have moved it. Note any station that is blocked by debris, vegetation, or a stored item that prevents rodent access.

Open the station and inspect the bait. Bait that is moldy, wet, or contaminated is not palatable; replace per the product label. Bait that has dust accumulation but no chew marks is in a station the rodents have not visited. Bait that has been chewed but not removed indicates initial sampling without commitment; the rodent is interested but the location or the formulation is not driving sustained feeding.

Pull a tracking patch (powdered talc on a tile) near each station and recheck at 24 to 48 hours. Tracks near the station with no station entry indicate the rodent is using the area but not entering; the station orientation, the bait formulation, or competing food sources are diverting interest.

Isolation tree

Start with rodent activity evidence on the property.

No rodent evidence, no station feeding: success outcome. Document and continue the program at standard intervals. Educate the customer that station maintenance and the absence of activity are the program's value.

Rodent evidence present, no station feeding: the station is missing the foraging path. Pull a tracking patch survey across the suspected harborage and runways; relocate stations to intersect the actual foraging path. Roof rats use elevated runways (along utility lines, fence tops, beams); Norway rats use ground-level runways along walls and structural edges; house mice use any vertical surface or wall edge within their 10 to 30 foot range. Match the station placement to the species behavior.

Rodent evidence present, sampling but no sustained feeding: the bait or the station type is not driving commitment. Switch the bait formulation; many rodent populations show preference for soft bait (paste, block, or pelleted) over wax block depending on local food competition. Some populations show bait shyness from prior bait exposure; switch to a different active ingredient class. First-generation anticoagulants (chlorophacinone, diphacinone), non-anticoagulants (bromethalin, cholecalciferol, zinc phosphide), and second-generation anticoagulants (commercial use only per EPA Risk Mitigation Decision) each have different palatability profiles.

Rodent evidence present, persistent station avoidance even after relocation and bait switch: target a known harborage. Place a snap trap or multi-catch trap inside or adjacent to the harborage. Some populations under heavy historical bait pressure develop persistent neophobia that defeats new bait stations; trap-based control is the IPM response.

Competing food source overwhelming station: a property with open dumpsters, pet food storage, bird feeders, or food preparation waste provides ample alternative food. The bait is competing against the customer's own food source. Document the conducive condition and provide written customer guidance per the IPM standard.

Confirming the call

Document the prior station locations, the current activity evidence, the tracking patch results, the station inspection findings, and the proposed correction. Schedule a 14-day post-correction check; station feeding at 14 days after relocation or bait switch confirms the program is working. Persistent no-activity with continued sightings at 14 days indicates a deeper population issue or an unaddressed competing food source.

Remediation by branch

True no activity: document outcome, continue standard program.

Station out of foraging path: relocate per tracking patch survey and species behavior. Document new locations in the customer record.

Sampling without commitment: switch bait formulation. Document the switch and the rationale.

Station avoidance persistent: deploy traps adjacent to harborage per the product label. Snap traps for mice; T-Rex or equivalent rat traps for rats. Multi-catch wind-up traps in commercial settings where high-population pressure exists.

Competing food source: written customer guidance documenting the conducive condition. The IPM standard adopted across state structural pest control boards requires this documentation; a program failure rooted in uncorrected conducive conditions is not a program defect.

References

1. EPA, Risk Mitigation Decision for Ten Rodenticides, 2008.
2. FIFRA, 7 USC 136j(a)(2)(G), Unlawful Acts, US EPA Office of Pesticide Programs.
3. Texas Occupations Code Chapter 1951 and 7 TAC 7.235, Texas Structural Pest Control regulations.
4. NPMA, Field Guide to Structural Pests, current edition.
5. University of California Statewide Integrated Pest Management Program, Rodent Management Guidelines, current revision.