Giant willow aphid

6603.    We have 100s of these in our backyard – Do you know what they are? Will they leave? Barrie, ON. Canada

 

Number 6603. This looks like a giant willow aphid, Tuberolachnus salignus (Hemiptera/Sternorrhyncha: Aphididae; subfamily Lachninae). Click here for details on their life history.