Knowledgebase

Prairie Cascade willow disease #770884

Asked September 06, 2021, 11:26 AM EDT

My two Prairie Cascade willows that we’re planted May 2021 developed discolored leaves and also is losing leaves mainly on lower branches. Trees are about 12 feet tall with 2 inch diameter trunks. They are planted in a wetland area next to a drainage stream. Both have the same problem.

Hennepin County Minnesota

Expert Response

Thank you for writing.

Send me a picture of the trunk where it enters the ground.  Remove a plastic collar if there is one first.

Steve Miles  Master Gardener, Hennepin County MN (Not an AI Bot) Replied September 06, 2021, 12:09 PM EDT

Inline image
Tree #1
Inline image

Tree#2



Sent from Yahoo Mail for iPad

On Monday, September 6, 2021, 11:09 AM, Ask Extension <<personal data hidden>> wrote:

The Question Asker Replied September 07, 2021, 10:36 AM EDT

Thank you for writing back.  I believe that this could be Willow scab.  Notice how the blackened area on leaves is now showing as a black bump at the base of the leaf in D29DD

https://www.purduelandscapereport.org/article/black-canker-of-willow/

https://www.rhs.org.uk/advice/profile?pid=575


I suggest that you contact an arborist to confirm the diagnosis and then decide on a plan to proceed.

Steve Miles  Master Gardener, Hennepin County MN (Not an AI Bot) Replied September 07, 2021, 4:22 PM EDT

Loading ...