They can be up to 1/2-inch long and they range from gray to black with red criss-crossing stripes on the wings. Nymphs have bright red abdomens.
A number of insects have discovered that heated buildings are ideal for surviving the cold of winter. Such pests include box elder bugs, cluster flies, and lady beetles. As the weather cools in late summer and early fall, the sun warms the southern and western walls of buildings. The warmth attracts these insects to buildings where they crawl inside cracks and stay there for the winter. This would be fine, but during warm winter days, some insects "wake up" and end up on the inside of the building. The box elder bugs feed on maple and box elder trees and usually infest buildings where these types of trees are nearby.
The best way to control such pests is by prevention as described below. If it's too late and they are already inside, it takes a professional to find and treat the right areas to minimize the numbers of pests seen inside. If your home has experienced a problem with over wintering pests, take the following steps next summer to prevent a recurrence, seal as many cracks and holes on the outside of the home as possible, especially on the south and west walls where the sun heats the home during the late summer and fall and be sure that all foundation and attic vents have tight-fitting screens.
Check the soffit vents and any gable vents or turbine vents on the roof. This treatment should be completed in mid- to late August.
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