Termite Callback Versus Warranty Versus Retreatment Decision Tree

Why this matters

Termite work carries the longest warranty exposure of any pest service and the highest single-incident liability when something fails. A subterranean termite callback that comes in during year three of a renewable bond is a different conversation, a different remedy, and a different financial entry than a callback at month four after a liquid barrier treatment. Misclassifying a soft mud tube as a real reactivation triggers an unnecessary re-treat. Misclassifying a swarmer event as cosmetic dismisses the customer's evidence of a live colony. This tree separates four outcomes that all walk in as "I have termites again": cosmetic survivor tubing with no reactivation, true reactivation inside the treated zone, breach of the treated zone with new colony introduction, and a non-termite identification mistake on the first visit.

Symptom presentation

Capture the original treatment type before the visit: liquid barrier (label-specific - Termidor, Premise, Altriset, etc.), termite bait system (Sentricon, Trelona, Advance), localized spot treatment, or pre-construction soil pretreatment. Capture the treatment date, the warranty terms (retreat only, retreat plus damage), the renewal status (current, lapsed, in grace), and the exact location of the customer-reported activity. Bring the original graph card or treatment diagram.

A bait system that triggers a station hit at month 14 of an active monitoring contract is expected program activity, not a callback. A liquid barrier site that reports mud tubing on a foundation wall three years post-treatment is the diagnostic problem this tree solves.

Quick checks

Confirm species. Subterranean Reticulitermes, Formosan Coptotermes, and drywood Incisitermes are three different products, three different scopes, and three different decision trees. Worker morphology under a 10x loupe plus location pattern (subterranean tubing from soil contact versus drywood frass pellets accumulating below an infested member) is enough to confirm in the field.

Inspect the original treatment zone integrity. For liquid barriers: foundation grade has not been raised by landscape mulch above the treated zone, no trench through the treated soil for irrigation or utility work, no new attached structure (deck, slab addition, planter box) bridging the barrier. For bait: original station count and station spacing are intact, no stations were removed by landscaper, no station was buried under added landscape material.

Probe any visible tubing. Live worker activity inside tube confirms active termites. Empty, dry, brittle tubing without workers is residual from prior activity, frequently from the pre-treatment infestation that the original liquid did not remove physically. The customer reading their own tubing as "new" is the most common false-callback driver.

Isolation tree

Branch A: Empty residual tubing, no live workers in tube, no fresh wood damage, no swarmers. Cosmetic residual from pre-treatment activity. No retreatment indicated. Knock down the tubing, document with photos, schedule a 30-day verification visit. Customer education focused on the difference between historic and active sign.

Branch B: Live workers in tube, tubing originates inside the treated zone, treatment is current and warranty is in force. True reactivation. Determine treatment type. For liquid: this is a barrier failure and a covered warranty retreatment. Common causes: subgrade tunneling at depth below the original trench (Formosan especially), discontinuous trench at a slab joint or porch return, soil disturbance after treatment. For bait: not technically a failure - bait systems are designed to feed the colony, and active feeding at a station is the system working. Reactivation in structural wood while a bait system is active means colony elimination has not been achieved and station count, station placement, or formulation needs to change.

Branch C: Live workers in tube, tubing originates outside the treated zone (new attached structure, new landscape feature, regrade above barrier). Treated-zone breach. Not a warranty failure - the original treatment did what it was paid to do, and the structural change created an untreated bridge. Quote the additional treatment scope to re-establish a continuous barrier or to extend baiting to the new feature. Document the post-treatment structural change with dated photos.

Branch D: Customer reports termite activity, inspection finds carpenter ants, drywood frass, or moisture damage. Misidentification on the first visit or a new non-subterranean issue. Drywood treatment is a separate scope (spot fumigation, whole-structure fumigation, or borate treatment per the label). Carpenter ants are not termites - reframe the visit. Moisture damage that looks like termite damage is a structural conversation, not a pesticide conversation.

Branch E: Swarmers observed indoors, no tubing found, no wood damage found. Swarmers can travel from a treated colony exit point to a window or light source without proving in-structure activity. Inspect for active tubing first. If none, swarmers may be from a treated colony in terminal decline or from an off-site colony that flew in. Do not retreat on swarmer evidence alone unless tubing or damage is found within the structure.

Confirming diagnosis

Branch B requires live workers in tubing originating from a confirmed treated-zone location, ideally photographed alongside the original treatment diagram. Pull tubing samples for species ID if Formosan is suspected (Formosan reactivation in a treated zone is a known and labeled limitation on several liquid products).

Branch C requires documentation of the post-treatment structural change. Compare current photos against the original site survey. The post-treatment new condition is the evidence.

Branch D requires species ID under loupe with documented characteristics (frass pellet shape for drywood, soldier mandible morphology for carpenter ant versus termite).

Remediation

Branch A (residual): no retreatment, photo documentation, 30-day re-inspect, no charge.

Branch B (true reactivation, liquid): warranty retreatment per the original product label retreatment instructions. Re-trench, re-rod, re-treat at full labeled rate. Document with new graph card. Liability per the bond terms.

References

• US EPA FIFRA Section 12, unlawful acts including use inconsistent with the label.
• BASF Termidor SC product label (current revision), trench rate and retreatment instructions.
• Bayer Premise 75 product label (current revision), application rate and structural treatment specifications.
• Texas Occupations Code Title 12 Chapter 1951 (Structural Pest Control Act), graph and record-keeping requirements.
• Sentricon Always Active product label (Corteva), station spacing and monitoring frequency.
• ASTM E2546-15, Standard Practice for Evaluation of Wood-Decaying Fungi and Wood-Boring Insects in Buildings.
• NPMA-33 Wood Destroying Insect Inspection Report, the federal real-estate transaction inspection form referenced by HUD and VA.