white growth on top branches of Thornless Hawthorn

Asked June 26, 2018, 12:04 PM EDT

We have a young tree that is recently showing a whiteish clump of growth on the top branches. I don't see this under Hawthorn diseases so am wondering what it is and what to do about it.

Jefferson County Colorado trees and shrubs

1 Response

Based on your photo, this could be the Hawthorn mealy bug, a sap-sucking insect. To confirm you may bring a sample in to the Jeffco Plant Diagnostic clinic located at the Jeffco Fairgrounds ($7 fee for Jeffco residents). Here are two references to give you some guidance on evaluating the insects yourself:

Best regards,