Barklice found on Fence

Subject: Swarms of Bugs on my Fence in Kentucky.
Location: Louisville, Kentucky
June 25, 2015 9:44 am
I woke up this morning and saw several swarms of the attached bugs on my fence in Louisville, KY. Any ideas what this is?
Signature: Rick L


Dear Rick,
These benign Barklice or Tree Cattle are generally found feeding on lichens and fungus on trees, and because of their numbers, they alarm gardeners.  They are perfectly harmless.  Finding them on a fence is unusual, but if you used untreated wood, fungus and lichen might be growing on the fence.

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