“We have a concrete block home. Termites cannot get into concrete.”
Each individual pellet is elongated and hexagonal in cross-section, with rounded ends. The shape comes from the termite’s digestive anatomy, and it is consistent across all drywood species.
Pellets are typically about 1 millimeter long. Roughly the size of coarse salt grains or fine coffee grounds.
Ranges from pale tan to dark brown, matching the color of the wood being eaten. Frass from a colony in light pine looks lighter than frass from a colony in darker hardwood.
Dry and granular. Pellets do not stick together into clumps the way wet sawdust does.
Accumulates in small piles beneath or near the infested wood. Common spots include the floor along baseboards, windowsills, attic floors beneath rafters, the tops of picture frames, and the base of wooden furniture.
A drywood colony kicks frass out through small holes in the wood called kick-out holes. The pile of frass grows gradually over weeks and months, often returning after cleanup if the colony is still active.
Pencil-thin to finger-thick tunnels built along foundations, block walls, support posts, plumbing penetrations, and interior wall surfaces. The tubes are made of soil, saliva, and termite waste, and they connect the soil colony to the wood the termites are eating.
A more advanced form of subterranean nesting material, particularly associated with Formosan and Asian subterranean termites. Carton is a spongy, layered material that can appear in wall voids, attics, and crawl spaces.
During swarm season, reproductive subterranean termites leave the colony, fly briefly, and drop their wings. A scatter of translucent wings near windows, doors, or light fixtures in spring is a classic subterranean termite sign.
Subterranean termite damage often shows along the grain, with layers of the wood hollowed out and galleries packed with mud and debris. Drywood damage, by contrast, leaves cleaner galleries without soil inside.
If you are finding small dry pellets, you are looking at drywood termites. If you are finding dirt-like tubes or packed mud in wood, you are looking at subterranean termites.Mixed material that includes shredded wood fibers, sawdust-like particles, insect body parts, and occasionally dead ants. The presence of insect parts is a strong indicator of carpenter ants specifically.
More fibrous and less uniform than termite frass. Does not have the clean hexagonal pellet shape of drywood termite droppings.
Typically matches the wood but often appears mixed with dark fragments from dead ants or darker wood.
Accumulates below active nesting sites, which are often in damp or damaged wood. Windowsills, door frames, porch columns, and outdoor wood structures are common carpenter ant locations in South Florida.
If you see small dark insect legs or head fragments mixed into what looks like sawdust, you are looking at carpenter ant frass, not termite frass.Actual sawdust from mechanical damage, woodworking, or drilling is usually easier to rule out.
Irregular shavings, curls, or fine powder depending on the source. No consistent pellet shape.
There is almost always an obvious cause nearby, such as a recent drill hole, construction work, a wood floor that has been sanded, or a piece of furniture being refinished.
Varies from fine powder to coarse shavings, depending on the tool or process that produced it.
Usually spread across a work surface or scattered from a specific tool location, rather than accumulating in small defined piles below an otherwise intact wood surface.
If you find a pile of debris and there is no plausible mechanical source, it is not sawdust. It is some form of insect activity.
Requires inspection to locate all active galleries and a treatment approach matched to the extent of infestation. Small localized infestations may be treated with spot treatments or wood injections. Widespread infestations typically require whole-structure fumigation.
Requires a soil treatment strategy that targets the colony in the ground. Liquid termiticide barriers and baiting systems are the standard approaches. Whole-structure fumigation does not work for subterranean termites because the colony lives in the soil, not the structure.
Requires locating the nest and treating it directly. Carpenter ant treatment is different from termite treatment and uses different products and techniques.
No treatment needed, assuming the mechanical source can be confirmed.
Treating the wrong problem wastes money and leaves the real issue active and growing. This is the single most common reason South Florida homeowners end up with serious structural damage after years of trying consumer products on what they assumed was a minor issue.If the debris is from an active infestation, you will see more of it within days or weeks. Note the location and check back.
Photos help a professional identify the type of debris and estimate the scope.
A small amount in a sealed bag is enough for identification. Include any insect parts or wings you can find nearby.
Drywood kick-out holes are small, often less than a millimeter in diameter. Look for tiny pinpoint holes in the wood, trim, or molding directly above the debris.
One pile of frass rarely exists alone. Additional accumulations nearby help map the extent of the activity.
An experienced inspector can identify the species in minutes and quantify the scope in a single visit. The cost of the inspection is a tiny fraction of the cost of an untreated infestation.
Palm Beach County, the Treasure Coast, and South Florida broadly have the highest density of termite activity of any region in the continental United States.
UF/IFAS research tracks multiple termite species active across South Florida, with both native subterranean and invasive Asian subterranean and Formosan termites documented throughout Palm Beach County and the Treasure Coast. Drywood termites are similarly well established and active in the region year-round.
Carpenter ants are also common in South Florida, particularly in structures with moisture issues or older wood components.
The practical reality is that any South Florida home is likely to encounter at least one of these over a decade of ownership, and many will encounter more than one. Accurate identification is part of responsible homeownership in this region.
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464 NW Peacock Blvd, Unit 106 Port St Lucie, FL 34986 (772) 783-4300
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UF/IFAS Fort Lauderdale Research and Education Center — drywood termite frass as a reliable visual indicator of active infestation in Florida structures
UF/IFAS research — multiple termite species active across South Florida with documented distribution across Palm Beach County and the Treasure Coast
UF/IFAS EDIS publication — carpenter ant identification and management in Florida structures
