Eastern Subterranean Termite in Mobile, AL

Scientific name: Reticulitermes flavipes. Common name: eastern subterranean termite. Family: Rhinotermitidae. Status in Mobile-Baldwin: native, ubiquitous across both counties — the species the textbooks describe.

Identification

Workers are 1/8 inch, creamy white, and indistinguishable in the field from Formosan workers without microscopy. Soldiers have a rectangular head (the diagnostic difference from Formosan’s teardrop-shaped soldier head). Alate reproductives are dark brown to black, about 3/8 inch including wings, and produce smaller, daytime swarms in late winter or early spring — much earlier in the season than Formosan.

Biology and life cycle

Colonies contain 30,000–250,000 workers at maturity — one to two orders of magnitude smaller than Formosan. Colony maturation takes 4–7 years. Foraging tunnels typically extend 100 feet or less from the colony. Workers cannot live without soil contact and require persistent moisture to survive, so every visible feeding gallery should connect back to the soil through mud tubes. Swarming season in Mobile-Baldwin is February–April, on warm afternoons after rain.

Habitat and range in Mobile-Baldwin

Established statewide in Alabama and across every parish of Louisiana, every county of Mississippi, every county of Florida. In Mobile and Baldwin counties, expect this species in any property with soil contact: slab-on-grade construction, crawlspace homes, pier-and-beam, raised cottages, manufactured homes. Eastern subs are the species most often found in pre-1970s construction in Spring Hill, Midtown, Old Dauphin Way, and downtown Mobile. Coastal Baldwin sees the species in similar density.

Risk to homeowners

Slower damage rate than Formosan: structural compromise typically develops over years, not months. That timeline gives homeowners the opportunity to find evidence and treat before catastrophic loss — provided regular inspections are happening. The risk pattern is also more predictable: eastern subs always need soil contact, so inspecting mud-tube routes along foundations, behind plantings, and inside crawlspaces catches infestations early.

Prevention

Soil grade-to-siding gap of 6 inches minimum. Functional gutters and downspouts directing water away from the foundation. No wood-to-soil contact in fencing, deck supports, or porch posts. Pressure-treated lumber on all framing within 18 inches of grade. Crawlspace vapor barriers covering 95%+ of soil. Annual exterior perimeter walk-through looking for mud tubes.

Treatment options

Both liquid barrier and bait-station approaches work well against eastern subs because both treatment vectors intercept soil-traveling foragers. Bait stations (Sentricon, Advance Termite Bait, Trelona) are particularly effective for this species because the colony is smaller and the bait reaches the queen faster. Liquid termiticides (Termidor, Premise, Taurus) create a non-detectable transfer zone in the soil. Both require ADAI WDC licensure.

When to call

Mud tubes on a foundation wall, inside a crawlspace pier, or climbing through a porch column — same-week call. Hollow-sounding baseboards with paint blistering — same-week call. Discarded wings on windowsills after a February–April afternoon — within 30 days. Call us: (251) 555-0100.

Related

See: Termite Control in Mobile, AL · WDO Inspection · Sentricon Baiting · Compare to Formosan