Thousands of Yucky Bugs!!!

yucky bugs
Surely you can help!?!
There are about 2000 of these living on my tree. Half of them seem to have just "hatched", half are mature. They don’t appear to be harming anything, just hanging out, migrating from the tree to the lawn and back again . Do you know what they are? Cause for concern?
Don and Elke (and Anna now too)

Dear Don, Elke and Anna
Your insect is a box elder bug (Leptocoris trivittatus) which is known to live in colonies of both adults which have wings and the nymph stage which is wingless. We at What’s That Bug? have gotten questions about this garden pest in the past. Here is an excerpt from a recent reply which should also apply to your situation.
On it says, "When present in large enough numbers Box Elder Bugs can do damage to Manitoba Maple trees. Most people call us in the fall because they are curious about the large numbers on the walls of their houses or concerned about the numbers that are getting in the houses. Washing them off the walls of the house with a blast of cold water from a hose may help. The only way to ensure that they do not get inside the house is to fill in all cracks where they could be getting in, a rather daunting and expensive task."

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