Aphid

6619.    These bugs are found in my backyard. They stay in cluster around the branches of a small tree, which is slowly dying due to these bugs. If you can let me know what they are and for i can effectively remove them, that would be much appreciated. Thank you! Calgary, AB. Canada

Number 6619. This is an aphid (aka plant louse), Hemiptera/Sternorrhyncha: Aphididae. These are sap feeders and some species can transmit viral diseases of plants. They can be removed with a strong stream of water from a hose, or sprayed with an insecticidal soap. Click here for more detailed information.