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Trees/Aspen tree problem


Some of our aspen trees have clusters of tiny scabs working their way up the trunks.  They look grayish in color, and are about the size of an aphid, but don't appear to be bugs.  Some of the tree trunks are mostly covered.  These trees are dying.  Other trees just have a few.  Do we need to remove the infected trees or is their something else we can do.  What is this?  Thanks for your help!  Annie

Sounds like the crawling stage of aspen scale or oyster scale. A picture would help a lot. Please attach a picture to the question. These can be controlled by spraying the trunk with Orthene an insecticide. If the foliage is healthy then the teed will be fine no need to remove it.  


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Jim Hyland


I am an expert in Forestry, Forest Entomology, Forest Pest Control, and Forest Health. Extensive knowledge in Identification of insects and diseases of trees. Expert on Bark beetles and other insects that attack forests. Also a Registrated Forester with extensive knowledge in the management and care of forests.


34 years as State Pest Management Chief in a Southern state. Extensive knowledge in Forestry.

BS with major in Forest Management and Entomology
Registered Forester
Certified Pesticide Appicator

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