Scale covering the branches of a lilac - Ask Extension
I'm trying to figure out what is covering the branches of our lilac bush. Our other one in a different part of the yard doesn't have this issue.
I'm...
Knowledgebase
Scale covering the branches of a lilac #866536
Asked April 30, 2024, 7:15 PM EDT
I'm trying to figure out what is covering the branches of our lilac bush. Our other one in a different part of the yard doesn't have this issue.
I'm wondering if it is a concern, and if might spread to a nearby mountain ash.
Thanks.
Ramsey County Minnesota
Expert Response
It is oystershell scale, a common insect. Scale is easiest to treat when they are young. As they mature, they develop a hard outer shell that makes treatment more difficult. I use insecticidal soap. See the following for treatment options: https://extension.umn.edu/yard-and-garden-insects/scale-insects
https://lancaster.unl.edu/oystershell-scale
https://www.canr.msu.edu/resources/oystershell_scale
https://lancaster.unl.edu/oystershell-scale
https://www.canr.msu.edu/resources/oystershell_scale
