Arborvitae

Asked May 18, 2018, 6:36 PM EDT

Our arborvitae are turning brown from the bottom up. Otherwise healthy. Any thoughts?

Lane County Oregon

1 Response

I see some fine webbing, especially in the close-up photo, so I suspect spider mites. However, I would be remiss if I didn't ask: is there a male dog in the neighborhood?

Here's a link to detailed information about spider mites:

https://pnwhandbooks.org/insect/hort/landscape/common/landscape-spider-mite

Attached is additional information about control of spider mites.