Knowledgebase

Pruning Golden canker from a pagoda dogwood #820829

Asked February 21, 2023, 4:32 PM EST

We have a very beautiful well formed pagoda dogwood on our newly acquired property. It was previously part of a pretty wild and neglected yard but after removing most of the other trees and shrubs we have kept this stately shrub as a centerpiece. Our arborist said it is a unique and shapely specimen. However, it does have golden canker and last year we carefully trimmed back all of the visible canker. It was summer when we discovered it so we tried to be ever so careful about pruning it in summer. We dipped the nippers in alcohol after each cut and disposed of each snippet. Now it is February and the proper time to prune in earnest. Attached are several pictures. What is the best way to approach this so as to minimize the canker's return?

Hennepin County Minnesota

Expert Response

My sympathies, I have had pagoda dogwoods for 40 years and managing golden canker for almost that long. Cutting off infected limbs and twigs as soon as they are noticed will stave off the inevitable. Once the canker reaches the main trunk the tree has perhaps 4 years before the main trunk needs to be removed. Hopefully your tree will last longer. It will respout and the replacement stems will provide the pretty flowers and food for the birds. Dogwoods also self seed readily so there are probably young trees already a couple of years old. 
Evelyn; thank you for your knowledge and advice. In the end of March I went out there and meticulously nipped every speck of evident golden canker. In between each cut I sterilized the nipper with rubbing alcohol. The pagoda looked primed and sculpted for an awesome spring flourish. ……….UNTIL…..this past weekend. We were right in the bullseye of that heavy wet snow and Saturday we woke to a beautifully flocked but cruelly stricken tree. Attached are a couple of photos. The left-most main stem with the two secondary stems branching off of that looks like it’s shot. Both of those secondary branches are split through the middle. We lost a few top branches on the right-most trunks but the trunks themselves are intact; probably because as you can see, we had previously shored them up by tethering them to the now destroyed trunk to the left. They had grown very horizontal to begin with and were in danger of toppling or breaking under just the weight of leaves and berries. These trunks will probably survive for a few more years if we keep them lashed to the dead stem. And new suckers will grow out from the base of the broken stem. We’ve been cutting them back each year. We could train one or two of them to replace this year’s loss. However, these will be suckers off the existing root mass. Not new stems with their own roots. Will these be inevitably weaker?
Question: Should we just dig out and replace this clump? It was the centerpiece of our new landscaping finished last fall so it’s a sad loss. How quickly could a new Pagoda grow? Can we get one that’s already good sized? Would a red bud be a good replacement? Our theme is a Japanese garden and I do like redbud but don’t they grow sooo slow? We’d value your advice. Any other small tree suggestions?
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On Tue, Feb 21, 2023 at 8:26 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied April 03, 2023, 6:57 PM EDT
The last heavy, wet snow was brutal and many trees in my neighborhood have lost branches. Some of the torn away branches are quite large. 
Your dogwood can be cut off at the soil and it will come back. However, because there is golden canker nearby the tree will be infected again. This happens to me when they are about 15 years old and a very nice size. Redbud actually grow at a medium rate, they just don't get very big. They achieve a height of about 15'. Crab apple, plum and cherry, service berry and amur maakia grow fast and also feed wildlife and please with lots of spring flowers. One can expect a life span of about 15-18 years, sometimes more.

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