Identification: the key differences from German cockroach
Brown-banded cockroaches are 10–14 mm as adults — comparable to small German cockroaches — and this size overlap causes misidentification. The distinguishing features: two pale transverse bands across the base of the wings (the 'brown-banded' pattern) rather than the two longitudinal stripes on the pronotum that define German cockroaches. The banding pattern is most visible in adults when viewed from above. Males have wings that extend slightly beyond the abdomen; females have shorter wings that do not fully cover the abdomen. Both sexes are capable of short flights (unlike German cockroaches which rarely fly). Nymphs show the same banding pattern on the abdomen — parallel pale bands across the dorsal abdomen surface — distinguishable from the longitudinal stripes of German cockroach nymphs.
| Feature | Brown-banded (Supella longipalpa) | German (Blattella germanica) |
|---|---|---|
| Size | 10–14 mm | 12–15 mm |
| Key marking | Pale transverse bands across wings | 2 dark longitudinal stripes on pronotum |
| Preferred habitat | Warm dry — electronics, upper cabinets | Warm humid — kitchen low-level voids |
| Moisture preference | Low — avoids damp | High — prefers humid |
| Flight | Occasional (both sexes) | Rare |
| Distribution in room | High-level — upper cabinets, ceilings | Low-level — floor-adjacent voids |
| Ootheca placement | Glued to surfaces (walls, furniture, cabinets) | Carried by female until hatching |
Why the habitat difference matters for treatment
The single most important fact about brown-banded cockroach treatment is that the harborage sites are completely different from German cockroach harborages. German cockroach protocols place gel bait at low-level kitchen harborages — under appliances, near plumbing, at floor-level voids. Brown-banded cockroaches are not in these locations. They are in the warm interiors of television sets, computers, clocks, and other electronics; inside upper kitchen cabinets; behind picture frames and wall hangings; in ceiling-mounted light fixture bases; in high drawer corners; and in the motor housing of ceiling fans and exhaust fans. A technician treating an apartment for what they believe is a German cockroach infestation but is actually brown-banded will place all bait at floor level, see little bait consumption, and conclude that the population is small or the treatment is working — while the actual infestation continues untouched in the electronics and upper areas.
Treatment protocol for brown-banded cockroach
Brown-banded cockroach treatment uses the same gel-bait and IGR active ingredients as German cockroach treatment, but in entirely different locations. Bait placements: upper cabinet interiors and upper-corner locations, inside and behind electronics (where accessible and safe — not directly inside sealed units but in the void around them), on ceiling fixture mounting plates, behind picture frames, in high drawer corners. IGR: applied to upper cabinet voids and in electronics-adjacent areas. Sticky monitors: placed at high-level locations — inside upper cabinets against the back wall, on top of the refrigerator, behind the television. Treatment success is assessed by high-level sticky monitor capture data, not floor-level traps. Oothecae placement is also different: female brown-banded cockroaches glue oothecae to surfaces (walls, furniture, inside electronics) rather than carrying them. Ootheca removal during treatment visits is important — finding and removing glued oothecae reduces the hatching cohort burden.
Introduction routes in Metro Vancouver
Brown-banded cockroaches in Metro Vancouver most commonly arrive via used goods — second-hand furniture, used electronics, cardboard moving boxes, and in some cases via multi-unit building migration from a pre-established population in the building. They are also occasionally introduced via commercial supply chains in hospitality and retail settings. The relatively low Metro Vancouver frequency of brown-banded cockroaches (compared to German cockroaches) makes them easy to miss in a first inspection — a technician expecting German cockroaches will look at floor-level harborages and may not find evidence.