Eastern Subterranean Termites in Indianapolis and Central Indiana

Which termites live in central Indiana?

The eastern subterranean termite, Reticulitermes flavipes, is the species that damages homes around Indianapolis. Colonies live in moist soil, often well below the surface, and workers travel up to wood through shelter tubes built from soil. They eat the softer layers of the wood first, leaving a layered pattern packed with dirt behind.

Workers are pale, soft and about the size of a grain of rice, and they avoid light and dry air. That is why you rarely see them: they stay inside soil, mud tubes and the wood they are eating. The EPA notes that most people do not know they have termites until they see a swarm or find damage during a remodel.

Purdue Extension's termite control guidance rests on one idea: break the connection between the soil and the wood. Every treatment method and prevention tip in this guide comes back to that.

Older houses are not the only targets. Newer slab homes in Greenwood, Fishers and Franklin Township get termites too, often through slab cracks, expansion joints or plumbing openings, with the mud tubes hidden behind drywall or flooring.

When do termites swarm in Indianapolis?

Swarms around Indianapolis happen mainly from March through May, usually on a warm day and often right after a rain. A mature colony sends out winged reproductives that fly briefly, shed their wings and try to start new colonies. Many homeowners first learn they have termites from a swarm near a basement window or patio door.

A swarm outdoors from an old stump, a landscape timber or a woodpile shows termites are nearby, which is normal in central Indiana soil. A swarm inside the house is different. Swarmers that emerge in a basement or along a window sill came from a colony with access to the structure, and that calls for an inspection.

Swarmers do not chew wood or sting, and they die quickly indoors. Vacuum them up, but first save a few in a sealed bag or on clear tape so the technician can confirm what they are. Piles of shed wings on a sill are worth keeping too.

Purdue's spring news coverage notes that winged ants swarm in the same weeks, which is why so many April calls start with one question: termites or ants?

How can you tell termite swarmers from flying ants?

Look at the waist, antennae and wings. A termite swarmer has a thick, straight body, straight beaded antennae and four wings of equal length that extend well past its body. A winged ant has a pinched waist, elbowed antennae and front wings noticeably longer than its hind wings.

Carpenter ants are the usual lookalike in Irvington and the near-east-side historic districts, where big shade trees and moisture-softened porch wood give them places to nest. They hollow out wood but do not eat it, and they push out coarse sawdust instead of mud. See carpenter ant control if your swarmers turn out to be ants.

What are the signs of termites in an older house?

The clearest sign is a mud tube, a pencil-width tunnel of soil running up a foundation wall, pier or basement post. Other signs include wood that sounds hollow or crumbles when probed, blistered or rippled paint, discarded wings on sills, and soil packed into damaged wood. Porches, sill plates and basement framing are the places to start.

Old limestone and brick foundations make inspections harder. Mortar joints, rubble fill and cracks give termites hidden routes to the sill plate, and plaster or paneling in a finished basement can cover a tube for years. The EPA suggests probing exposed wood with a flathead screwdriver to find soft or hollow spots.

Porches deserve a close look on Craftsman bungalows and Victorians. Wood steps resting on soil, lattice touching mulch and porch posts set into concrete are classic entry points. Firewood stacked against the house and landscape timbers along the foundation add more.

Crawlspaces under the frame cottages of Cottage Home and Fountain Square deserve the same attention. Low clearance, damp soil and framing that sits close to the ground make them hard to inspect and easy for termites to reach, so a quick look from the access door is rarely enough.

• Basement sill plates and the ends of floor joists
• Porch steps, posts and lattice where wood meets soil
• Door and window frames on the lowest floor
• Framing around plumbing under bathrooms and kitchens
• Expansion joints and cracks in garage slabs and stoops
• Stumps, landscape timbers and firewood near the house

How are termites treated, and what does it cost?

There are two main methods. A liquid termiticide is applied to the soil along the foundation, often by trenching outside and drilling slabs or basement floors, to form a treated zone. A bait system places monitored stations in the soil that workers feed on and carry back to the colony. Both take a trained applicator.

The EPA notes that a soil-applied barrier is the most common way to treat an active infestation, and that termiticides must show they protect structures before they can be sold. Liquid work costs more on houses with full basements, crawlspaces or slabs that need drilling, which describes much of the older housing on the east side.

Baits cost more over the years because monitoring continues, but they mean less drilling through finished floors. Your technician explains the options, the products and the price, and you approve the plan before any termite treatment begins. The Indianapolis pest control cost guide puts these numbers next to every other service.

Doing it yourself is hard to get right. Treating soil along a basement wall or under a slab takes equipment, a lot of product and careful placement, which is why the EPA says termiticide application is in most cases a job for a trained professional.

Do you need a termite inspection to buy or sell a home?

Many lenders and buyers ask for one. A wood-destroying insect (WDI) report for your lender or buyer records visible evidence of termites and similar pests on the day of the inspection. Nationally, HUD and VA sales use the NPMA-33 form unless a state requires its own, so ask your lender which form it needs.

In Indiana, inspecting a building for termites and other wood-destroying organisms for hire falls under Office of Indiana State Chemist certification in category 7b, Termite Control, or category 12, Wood Destroying Pest Inspection. Category 12 is inspection only and does not allow applying pesticides for hire.

The report covers what the inspector can see and reach. Finished basements, boxes stacked against walls and enclosed porches limit what can be checked, and the report should say so. If activity turns up, booking the inspection early may leave time to schedule treatment before closing. See termite inspection for what the visit includes; the report is estimated at $75–$150.

How can you lower termite risk around your house?

Keep soil, water and wood apart. Make sure gutters and downspouts carry water away from the foundation, keep mulch thin and a few inches back from siding, stack firewood away from the house, and fix wood that touches soil, such as porch steps and lattice. Then have the house inspected periodically, even without a swarm.

Moisture is the other half of the problem. A leaking downspout beside a limestone foundation, a crawlspace that stays damp all summer or a clogged box gutter dripping onto a porch post can keep wood soft enough for termites to move in quickly.

Trees and shrubs planted tight against the house hold moisture and hide mud tubes, so the EPA advises keeping plantings back from the structure. In a locally protected historic district such as Irvington, check with the IHPC before changing visible exterior features like porch skirting or steps.

Plan on a fresh inspection after any project that disturbs soil along the foundation, adds a porch or deck, or covers basement walls with new finishes. Keep the written service report from each visit, too; it shows a future buyer's inspector what was checked and when.