Ohio State University’s Plant Pest Diagnostic Clinic identified an eastern subterranean termite sent from Dayton in April 2024, and it cites a risk rating of moderate to heavy for Ohio’s subterranean termites. This guide sets out what that supports for a Columbus home, what it does not show, and what an inspection checks.
Key takeaways
- OSU’s clinic identified one eastern subterranean termite sample from Dayton in April 2024.
- The clinic cites a risk rating of moderate to heavy for Ohio, from a 1994 study.
- The clinic says swarming insects indoors mean colonies are inside the building.
- One sample does not state how many colonies exist, or where they are in Columbus.
- An inspection of the building, not the sample, decides what is present.
- A treatment follows the finding, and a licensed applicator carries it out.
What did the 2024 OSU sample actually show?
The OSU clinic identified an eastern subterranean termite from a specimen sent from Dayton, in April 2024, based on body colour, swarm time and location. That is one identification from one specimen.
A clinic identification is a useful public record, because it shows the eastern subterranean species has been recorded in the state recently. It does not say how many colonies exist, how far they have spread or whether any particular Columbus house is affected. Those questions need a building-level inspection.
The clinic’s method is worth noting. The identification used the insect’s body colour, the time of the swarm and the location where it was found, which are the kinds of observation a homeowner can also make and report.
What does the moderate-to-heavy rating mean?
The clinic cites a rating of Ohio’s subterranean termite risk as moderate to heavy, drawn from a 1994 study by Beal and colleagues. The rating is a state-level judgement from an older source, and it is not a house-level finding.
A risk rating tells a homeowner where to look, not what is there. Moderate to heavy means the subterranean termite is a real concern across the state, and it justifies an inspection on a building with wood close to the soil. It does not mean a particular house has termites.
The rating is also an older source. The clinic cites a 1994 study, and a homeowner should read it as the state picture at that time, supported by the more recent identification. An inspector will bring the current picture to the building.
What do swarms tell a homeowner?
The clinic says swarming insects indoors mean colonies are inside the building. That is the most practical point for a homeowner who finds winged insects on a windowsill or a floor.
A swarm is the reproductive stage of a colony, and the winged insects leave the colony to start new ones. Finding them indoors means the colony has an opening into the building, which is why the clinic’s point is so direct.
The swarm does not show the size of the colony or its exact location. The response visit starts from where the wings are found, and the inspection then reads the foundation, the sill and the wood nearby.
What should an inspection of a Columbus house check?
An inspection checks wood in contact with soil, the sill and the joists, the foundation cracks, the basement or crawl space and any mud tube or swarm sign. Moisture is read where the wood looks suspect.
The check starts outside, with the grade, the downspouts and any wood on soil, such as steps, posts and fence attachments. The foundation is read for cracks and for the joints around pipes and cables. Each finding is recorded by location.
Inside, the basement or crawl space is the main place to check. The sill is probed where it looks soft, the joists are checked for damage and the moisture is read at the lowest points. Any mud tube on the foundation face is followed to the wood it reaches.
What does a report need to say?
A report should state what was checked, what was found and where, what could not be reached and what is recommended. It should not claim an infestation the inspection did not find.
A useful report is specific: the basement wall on the north side was read, the sill was probed at three points, one tube was found on the north pier and it was followed to a sill section that was sound. A report that says only that the house is clean is not a finding and should be queried.
The recommendations are kept apart from the findings. A finding is what was seen; a recommendation is what the inspector advises. Keeping them apart lets the homeowner decide what to do first.
What should a homeowner do?
Keep wood off the soil, remove waste wood, seal the foundation cracks and manage the water, as the prevention advice says. Book an inspection when a sign appears, and use a licensed applicator if a treatment is found to be needed.
Prevention is the first step, because it reduces the conditions termites need and costs little. The inspection is the second step, taken when a sign appears or when the building has a known condition such as wood on soil. A treatment is the third step, decided on the inspection and carried out by a licensed applicator.
A homeowner should not treat an active colony with a product bought from a shop. The licence for paid pesticide application in Ohio is issued through the Department of Agriculture, and the applicator should show the category covering termite work.
What about a house that was treated before?
A house with a past treatment needs its records checked, because a treatment can have been placed in one part of the building and not another. The inspector reads the record and checks the points it does not cover.
A past treatment record shows where product was placed, when and by whom. It does not show whether the activity has stopped. The inspector compares the record with the current signs and reports any mismatch.
A homeowner who has a past report should bring it to the inspection. The new report can then state what has changed since the last one, which is more useful than a fresh report with no reference.
How does a termite inspection differ from a general visit?
A general visit looks for many pests across the building. A termite inspection focuses on wood in contact with soil, the foundation and the signs subterranean termites leave, and it reports on the wood by location.
The questions differ. A general visit asks where the pest is and how to remove it. A termite inspection asks whether the wood is sound, whether moisture is reaching it and whether the insects are active in it. Those answers are reported in terms a builder or a lender can read.
A homeowner who needs a report for a sale or a renovation should say so when booking. The inspector then sets the scope and the report to match what the requester needs.
What should a homeowner do about moisture?
Moisture at the foundation is one of the conditions a termite inspector looks for, and it is one a homeowner can change. Extending downspouts, regrading and keeping mulch below the siding are simple steps.
Standing water against a foundation keeps the soil damp where insects can move. A downspout that discharges at the wall adds water, and a grade that slopes toward the house does the same. The inspector records these as conditions, separate from any finding of damage.
The fix is usually simple and inexpensive. The report says which change to make first, and the homeowner can make it before the next season.
What to do with an older treatment record
A house with a past treatment needs its record checked, because a treatment may have been placed in one part of the building and not another. The inspector reads the record and checks the points it does not cover.
A past treatment record shows where product was placed, when and by whom. It does not show whether the activity has stopped. The inspector compares the record with the current signs and reports any mismatch.
A homeowner with a past report should bring it to the inspection, so the new report can say what has changed since the last one. That is more useful than a fresh report with no reference.
What does a Columbus homeowner ask the inspector?
Ask what was checked, where the moisture was read, which parts could not be reached and what the next step is. Ask for the findings in writing with their locations, and for the basis of any recommendation.
A question about the wood should get a location and a reading. A question about a crack should get its length, its direction and whether it goes through the wall. An inspector who can answer those is describing the building, and one who cannot should be asked to return with the detail.
Ask for the licence details at the same time, and check them with the Ohio Department of Agriculture before any treatment is agreed. The inspection and the treatment are separate steps with separate reports, and the homeowner should keep both.
Frequently asked questions
Does the 2024 sample mean termites are in my house?
No. The sample came from Dayton and identified one species from one specimen. An inspection of your house decides what is present.
Where can I read the OSU clinic’s page?
The clinic’s pages are published through Ohio State University Extension. This guide uses the points described above, and a homeowner can read the originals for the detail.
Is moderate to heavy the same as high?
It is the rating the clinic cites for Ohio. This guide does not convert it into any other scale, and it does not claim a house-level rate.
Should I wait to see if signs get worse?
No. A sign that is seen should be inspected promptly, because waiting can let damage grow in the wood and the inspection is the quicker way to know.
Does the Ohio risk rating apply to my street?
The rating is a state-level judgement. It does not describe any street. An inspection of the building is the way to find out what is there.
Should I dig around the foundation to look for termites?
Not as a first step. Digging can disturb the soil, damage a sound wall or a service line and destroy evidence the inspector needs. The inspection reads the surface first, and any digging is agreed with the homeowner.
Sources
- Ohio State University Plant Pest Diagnostic Clinic, eastern subterranean termite identification, April 2024 (ohioline.osu.edu)
- Ohio State University Extension, termite risk for Ohio (ohioline.osu.edu)
This guide is general information for Franklin County homeowners, not a substitute for an on-site inspection. Prices are estimates. See our disclaimer.