Know Your Pest

Start with where and when you found it, not just what it looks like — those two facts narrow it faster than color does. Something at a sunny upstairs window in February is almost certainly an overwintering fall invader. Something fast in a damp basement is usually a moisture pest. Something in the pantry came in with the food. Then use the group pages above to confirm. If you are still unsure, photograph it against something for scale and send it to 866-BUGBOSS — identification is free and it is genuinely the most common call we take.

Far fewer than the internet suggests, because most national pest content is written for warmer states. Out here the work concentrates on fall invaders — cluster flies, boxelder bugs, Asian lady beetles and stink bugs — plus rodents moving in from fields every autumn, carpenter ants in wet wood, stinging insects from July through September, ticks and mosquitoes through summer, and wildlife in attics and outbuildings year-round. Termites, in contrast, are a marginal concern in this part of the state and are widely oversold.

Most of what people find is a nuisance, and every profile says so plainly where that is the case. Cluster flies, boxelder bugs, lady beetles, millipedes, sowbugs and springtails cannot bite, sting, breed indoors or damage anything. The ones that genuinely warrant urgency are stinging insects around anyone with an allergy, rodents where wiring is being chewed, ticks because of Lyme, bats and raccoons for health reasons, and carpenter ants because of what the moisture behind them is doing to the structure.

Several of these genuinely resolve themselves, and we would rather tell you that than sell you a program. Overwintering insects die off by spring and cannot multiply indoors. Wood cockroaches and most millipede and sowbug invasions are outdoor animals that cannot establish inside. Wasp colonies die at hard frost. What does not resolve on its own is anything breeding indoors — rodents, German cockroaches, bed bugs, pantry pests — plus wildlife in a structure and carpenter ants, because the moisture feeding them is still there.

Because timing is most of the outcome for the pests that define work in this region. A fall invader treatment applied in late August or early September, before the insects mass on the siding, works well; the identical treatment applied in late October, after they are in the wall, does very little. Bat exclusion has a legally significant closed season. Wasp nests are trivial in May and dangerous in August. The season line on each profile is there because acting at the wrong time is the most common reason people conclude that treatment does not work.

It is written for one place. The building stock here — century-old farmhouses with balloon framing, pole barns, seasonal cabins, mill-era rentals — determines how pests get in and what stops them, and a page written for a national audience cannot account for any of it. Every profile is reviewed by Brian Zahringer, a certified Wisconsin Commercial Pesticide Applicator (#103689), and says plainly where you do not need to hire anybody.