Ground Beetle

Ground Beetle (Scarites quadriceps)

Burrowing Ground Beetle

Inhabits soil of turf, gardens, and bare ground; strictly nocturnal, spending daylight hours in self-excavated burrows; most active in spring and fall when soil temperatures are between 55–75°F.

Scarites quadriceps adults are 0.6–1.0 inch, jet-black, heavily built, with constricted "waist" between thorax and abdomen — a hallmark of the genus Scarites. Powerful mandibles are adapted for capturing and subduing soil-dwelling prey. Both adults and larvae are predators of cutworm larvae, grub-stage beetles, root-feeding caterpillars, and other soil invertebrates. Scarites is among the most turf-active genera in the subfamily Scaritinae, with burrows often visible as clean round holes at turf-soil interface.

Native region: Scarites quadriceps occurs throughout the eastern United States including Tennessee, particularly in moist, compacted soils along stream edges and in maintained turf.

In Middle Tennessee lawns, Scarites quadriceps is a quiet but consistent predator of black cutworm and fall armyworm larvae in the thatch-soil zone. Its nocturnal habit means it rarely surfaces during daylight; small, perfectly round burrow entrances (4–6 mm diameter) in bare or thin turf areas are the primary evidence of activity. Insecticide applications targeting cutworms or armyworms in the soil layer — particularly granular chlorpyrifos or bifenthrin — reduce ground beetle populations. Where armyworm pressure is moderate, preserving Scarites populations by using targeted surface sprays rather than soil-incorporated materials allows natural predation to extend the control window.