Stink Bugs, Boxelder Bugs and Lady Beetles in Avon Homes

How can you tell a stink bug from a boxelder bug or a lady beetle?

Look at shape and color. The brown marmorated stink bug is a mottled brown shield a bit over half an inch long, with light bands on its antennae. Boxelder bugs are narrow and black with red lines on the back. Multicolored Asian lady beetles are rounded, tan to orange-red, with an M- or W-shaped mark behind the head.

All three arrive at the same time and in the same places, so people tend to lump them together. Telling them apart helps, because each has its own story. The stink bug comes from gardens, field edges and tree lines, boxelder bugs from seed-bearing boxelder trees and some other maples, and lady beetles from trees where they spent the summer eating aphids.

Native lady beetles and other true bugs live around Avon too, but they rarely crowd onto a house by the hundreds. If the insects on your siding match a row below and show up in fall, you are looking at an overwintering invader.

Why do certain Avon houses get hit harder than the neighbors?

Exposure decides most of it. A house with a sunny south or west wall, light-colored siding and a field, woodlot or tree line nearby collects far more fall invaders than a shaded house in the middle of a subdivision. Tall homes, older farmhouses with loose trim and homes near boxelder trees tend to see the heaviest numbers.

Avon's growth explains a lot. The city went from about 11,400 people in 2000 to 24,847 in 2020, and much of that growth came as subdivisions on former farmland. Plenty of backyards still face soybean fields, hedgerows or woodlots, which is exactly where stink bugs feed and lady beetles spend the summer.

The older part of town has its own problem. Farmhouses and early-1900s homes near the French Creek District often have wood clapboard, original window frames and attic vents with worn screens. Every one of those gaps is an opening, and barns or sheds on the same lot collect bugs that later drift to the house.

Lakeshore neighbors in Avon Lake and Bay Village see lady beetles on pale siding and boxelder bugs near maples, while homes on the field edge inland tend to collect more stink bugs.

Which gaps let fall invaders into walls and attics?

They use the same small openings that mice and drafts use. The usual entry points are gaps around window and door frames, loose siding and trim, soffits and fascia, attic and gable vents with torn screens, and holes where utility lines, dryer vents and outdoor faucets pass through the wall. Gaps barely wider than a pencil lead can be enough.

Most bugs end up where you rarely look: wall voids, attic insulation, the space above a drop ceiling. When a wall warms on a sunny winter day, some wander inward and come out around light fixtures, outlets and window casings. That is why upstairs bedrooms on the sunny side of the house are often where people find them first.

• Window frames, especially where trim meets siding
• Window air conditioners and their accordion side panels
• Gaps behind fascia boards and along soffit vents
• Ridge, gable and attic vents with torn or missing screens
• Openings around cable, phone, gas and AC lines
• Dryer and bath fan vents without a working flap
• Worn sweeps under exterior doors and gaps beside the garage door
• The joint where a chimney meets siding or roofing

What is the right way to seal up before September?

Seal in late August or early September, before bugs start gathering on warm walls. Caulk gaps around window and door trim, repair torn screens, add door sweeps, screen attic and gable vents, and fill openings around utility lines with sealant or copper mesh. Work the sunny south and west sides first, where they land most.

Exclusion is the main defense, and it outlasts any spray. Use a quality exterior caulk on fixed joints, foam or copper mesh in larger holes and new weatherstripping on doors. Never seal combustion air intakes, furnace or water heater vents, or weep holes in brick, since those need to breathe.

Second-story gaps are where many homeowners stop, because they need a tall ladder. They are also where many bugs go in, since the upper walls and soffits soak up the most afternoon sun. A technician can reach and seal those spots and treat the walls the bugs favor.

The window is tight. Once the bugs are inside the walls, sealing traps them in as much as it keeps others out, and they will come out indoors over the winter anyway. The work belongs to late summer, not to the week you notice them on the curtains.

How do you get rid of the ones already in the living room?

Vacuum them up and empty the bag or canister outside, or knock them into a jar of soapy water. Do not crush stink bugs or lady beetles, which releases odor and stains, and skip indoor bug bombs; they do not reach bugs hiding in walls. The bugs do not breed indoors, so steady removal works until spring.

A dedicated shop vacuum, or an old stocking stretched inside the hose, keeps the smell out of your household vacuum. Light traps sold for stink bugs catch some wanderers in an attic or spare room, but they do nothing about the gaps that let them in.

Expect a few on warm days from January through April. That is normal and does not mean a treatment failed or a new group arrived. They are leaving their winter hiding spots and heading toward light.

Indoor spraying is rarely the answer. It adds product to living spaces without reaching the bugs inside the walls. If the numbers are heavy, call (855) 974-4733 and a technician can trace where they are coming in.

Can fall invaders hurt people, pets or the house?

Not in any serious way. None of the three damages wood, wiring or insulation, and none breeds indoors over winter. Stink bugs smell when disturbed, boxelder bugs can spot fabric, and lady beetles may pinch skin and leave yellow, smelly stains. Some people report allergy symptoms around heavy lady beetle numbers, so mention it to your doctor if you react.

Gardeners see a different side. The brown marmorated stink bug feeds on the fruits, seeds, stems and leaves of a wide range of plants, so backyard tomatoes, peppers, apples and sweet corn can end up with dimpled or corky spots. Orchards and vegetable growers around Ohio watch it closely.

The multicolored Asian lady beetle was brought to North America on purpose, as a predator of aphids on trees, and it still does that job every summer. The trouble is only its habit of crowding onto buildings in fall.

Fall invaders are not the same as spotted lanternfly, a planthopper that feeds on tree sap and is under an Ohio quarantine. If you are seeing gray, spotted insects with red hind wings on tree trunks, read the spotted lanternfly guide for Lorain County.

What happens on a fall invader visit in Avon, and what is the price?

A technician inspects the sunny walls, roofline and attic, seals the gaps a homeowner cannot easily reach, and applies a labeled exterior treatment where bugs gather. Around Avon, stink bug, boxelder bug and lady beetle exclusion plus exterior treatment is estimated at $200–$500, timed for late summer to fall and approved before work begins.

Price depends on height, size and how much sealing the house needs. A one-story ranch with tight trim lands near the low end. A two-story colonial or a farmhouse with lots of trim, gable vents and a barn nearby sits closer to the top.

Products are applied according to their labels, and the technician explains pet and family precautions, such as how long to keep pets away from treated walls. You get a written service report listing what was found, what was applied and where.

In heavy years, some households pair fall exclusion with a quarterly plan so the late-summer visit is already on the calendar. See stink bug and fall invader control or the Avon pest control cost guide for the full price table.

Does yard work around the house cut next year's numbers?

A little, but far less than sealing. Trimming branches that touch the roof, keeping firewood and stored lumber away from the walls, and pulling volunteer boxelder seedlings removes some landing and hiding spots. Outdoor lights near doors also draw stink bugs on fall evenings, so switching to dimmer or yellow bulbs can help.

Cutting down a seed-bearing boxelder is sometimes suggested for boxelder bugs, since they feed on its seeds. On its own it rarely solves the problem in Avon, where boxelders and maples grow along creeks, ditches and the tree lines between subdivisions. Treat it as a bonus, not a fix.

Gardens matter for stink bugs. Picking up dropped fruit and pulling spent tomato and pepper plants in early fall removes food that keeps them close to the house. Harvest on nearby soybean fields can also push a wave of bugs toward the nearest sunny wall, so field-edge homes should have their sealing finished before the combines roll.

Lady beetles add one wrinkle. If hundreds are already clustered in an attic or a wall cavity, vacuum out what you can reach before closing the gaps, so fewer are left inside to wander out in February.