Boxwood Blight - Ask Extension
Hi - do you have an expert and/or advice to hel;p me determine if my dead and dying boxwood plants are infected with "boxwood blight?" There...
Knowledgebase
Boxwood Blight #787985
Asked April 25, 2022, 2:26 PM EDT
Hi - do you have an expert and/or advice to hel;p me determine if my dead and dying boxwood plants are infected with "boxwood blight?" There are other possibilities, including too much shade, overwatering.
Thank you and PS I do live in Oregon
Multnomah County Oregon
Expert Response
Thank you for your question, Barton. There are 4 known diseases of boxwood in the PNW. Although blight has been detected,this doesn't appear to be your plants' problem. I see none of the black spots it has. https://pnwhandbooks.org/plantdisease/host-disease/boxwood-buxus-spp-box-blight
What is more likely, depending upon soil conditions. is this: https://pnwhandbooks.org/plantdisease/host-disease/boxwood-buxus-spp-phytophthora-root-crown-rot
Since the defoliation appears to be so extreme, I suggest that you submit a sample of the plant tissue and soil to the OSU Plant Disease Clinic: https://bpp.oregonstate.edu/plant-clinic
I hope they can help. Good luck!
What is more likely, depending upon soil conditions. is this: https://pnwhandbooks.org/plantdisease/host-disease/boxwood-buxus-spp-phytophthora-root-crown-rot
Since the defoliation appears to be so extreme, I suggest that you submit a sample of the plant tissue and soil to the OSU Plant Disease Clinic: https://bpp.oregonstate.edu/plant-clinic
I hope they can help. Good luck!
