Why am I seeing a lot of boxelder bugs in the Spring in the Okanagan?
In late March to early April, adults leave their winter sites to return to their host trees. The boxelder beetles thrive on maple and seed-bearing boxelder trees during the warmer months when they lay their eggs and feed on leaves, flowers and seeds. They also feed on plum and apple tree fruit. In the fall boxelder bugs become gather on the sunny side of rocks, trees and buildings. They move to nearby buildings or homes for the winter. Generally, these pests hide in small cracks and crevices in walls to insulate themselves from the cold winter temperatures.

Are they dangerous?
Boxelder bugs are not known to bite, but their piercing-sucking mouth can occasionally puncture skin, causing a slight irritation and producing a red spot similar to a mosquito bite. When crushed or handled roughly, boxelder bugs may leave a reddish orange stain from their fecal material that can result in discoloration of curtains, drapes, clothing, etc.