Do these bugs damage the house or the food?
The OSU fact sheet says they cause no structural or food damage. Their effect is in the number of bugs in the living space and the mess that crushing them makes.
The distinction matters for how the problem is handled. A structural problem calls for a structural response, and a nuisance problem calls for sealing and removal. Boxelder and leaf-footed bugs fall into the second group, so the work is aimed at closing the route and clearing the bugs, not at treating the building’s structure.
A homeowner who sees bugs inside may worry about food. The OSU account says there is no food damage, but the bugs should not be left to crawl over food surfaces, and any food left out should be covered.
Why should bugs be vacuumed and not crushed?
OSU says crushing a boxelder or leaf-footed bug can leave an odour and fecal stains on curtains and walls. Vacuuming removes the bugs without that mess, and the bag is sealed and removed.
A crushed bug leaves a fluid that stains light fabric and can leave a smell that lingers in a room. The stain is usually on curtains, pale walls and upholstery. A vacuum removes the bug and keeps the stain away from the surface.
The vacuum bag or canister should be emptied outdoors and sealed. A bug in a loose bag can climb out in a warm room, which defeats the purpose of the vacuum.
When is a residual worth adding?
A residual is used where bugs keep gathering on the building after the gaps are closed. It is placed according to the label, usually on the sunny walls or along the foundation, and it is not a substitute for sealing.
A residual works on the insects that touch or pass over the treated surface. It does not close a gap, and a bug that enters through an untreated crack will not be stopped by it. That is why the sealing comes first, and the residual is considered only once the gaps have been dealt with.
The placement is recorded in the report, so the next check can see whether it is still working after rain and sun. A residual that has weathered away is replaced on the schedule the technician sets.
What can a homeowner do this week?
Walk the outside of the house on a bright day with a flashlight, mark each door and window gap, check the soffit vents for torn screens, and vacuum the bugs inside without crushing them.
The walk takes less than an hour for most houses. Hold the light on the outside of each frame and look for brightness on the inside. A piece of painter’s tape marks each spot, and the marks make the sealing faster when the materials are ready.
Keep the curtains closed in the room where bugs are found, and wash the curtains if they are stained. Those steps reduce the mess while the sealing is being done, and they make the next check easier to read.
What does a homeowner do if the bugs come back in the spring?
Spring activity usually means a gap that was missed in the autumn or a door left open on a warm day. The homeowner notes the date and the room, and the technician checks the route before any new step is taken.
A few bugs in a room in April are most often bugs that spent the winter inside a wall and came out when the house warmed. Vacuum them, note where they were, and keep the route in mind for the autumn sealing.
A steady number in the same room through the spring points to a gap that is still open. The technician checks that spot on the next visit, and the sealing list is updated for the coming autumn.
