Drywood termites in Southern California re-infest fumigated homes within 18 months because neighbor-to-neighbor aerial transfer is uncontrollable and whole-structure fumigation costs $3,000-8,000 per occurrence with no preventive option

Drywood termites (Cryptotermes brevis and Incisitermes minor) in coastal Southern California — Los Angeles, San Diego, Orange County — do not require soil contact or moisture, instead living entirely inside wood structural members, furniture, and trim. So what? Unlike subterranean termites that can be blocked with soil barriers and bait stations, drywood termites fly directly to target structures during swarming events (typically September-November in SoCal), land on exposed wood surfaces, bore entry holes smaller than a pencil lead, and seal themselves inside, making their establishment completely invisible and unpreventable without hermetically sealing every wood surface on the building exterior. So what? By the time homeowners notice frass (fecal pellets) — the primary visible indicator — a drywood termite colony has been feeding for 3-5 years and has typically caused $5,000-20,000 in structural damage to rafters, wall studs, or window frames. So what? The only proven whole-structure treatment is sulfuryl fluoride (Vikane) fumigation, which requires the entire home to be tented for 48-72 hours, all occupants, pets, and plants removed, all food and medicine sealed or removed, at a cost of $3,000-8,000 depending on square footage — and this treatment has zero residual effect, meaning the home can be re-infested by the next swarming season 12-18 months later. So what? In dense SoCal neighborhoods where homes are 5-15 feet apart (typical lot coverage in Santa Monica, Long Beach, central San Diego), fumigating one home while adjacent infested homes remain untreated guarantees re-infestation because alates (swarming reproductive termites) from untreated neighbors fly to the freshly fumigated structure. So what? The problem persists structurally because there is no preventive treatment for drywood termites, no systemic bait equivalent to subterranean termite bait stations, no building code requirement for coordinated neighborhood treatment, and the architectural style of Southern California (exposed wood eaves, rafter tails, wood siding, and wood window frames) presents maximum attack surface. The $3,000-8,000 fumigation cost every 3-5 years functions as an unavoidable, uninsurable tax on SoCal homeownership with no engineering solution on the horizon.