Don't want to lose this redbud. What is going on? - Ask Extension
I noticed the tree was just a little yellow at the top, but now it's worse. It has been a well-rained-on August, so I do not think it is dry. A gard...
Knowledgebase
Don't want to lose this redbud. What is going on? #846711
Asked August 21, 2023, 6:47 PM EDT
I noticed the tree was just a little yellow at the top, but now it's worse. It has been a well-rained-on August, so I do not think it is dry. A garden nearby died off for the most part as well. Is it a fungus? Can it be sprayed? I should let you be the docs and quit guessing. Thanks for your help, this was the best growing thing in the whole yard and don't want to watch it die.
Washtenaw County Michigan
Expert Response
Hello Joseph,
So sorry about your tree!
Redbuds are susceptible to Verticillium wilt (especially in wet sites) and Botryosphaeria canker which would produce dieback on the branches.
The first external signs that a tree has a Verticillium Wilt infection is the yellowing and then browning of leaves at the ends of some branches. Initially the yellowing and browning of the leaves is spotty throughout the tree and does not follow a uniform pattern. As the fungus begins to block the vascular system, the browning of leaves becomes more acute and more wide-spread. New leaves generally are either non-existent, undersized or yellowed.
Botryosphaeria canker, a common disease among redbuds, is a fungal disease that enters twigs and branches, feeds on the living tissue below the bark, and spreads around the stem. Once it encircles the branch, the water supply beyond that point is cut off to the leaves. The branch will suddenly wilt and die. Redbuds that are under drought stress will more easily succumb to Botryosphaeria canker than a well-watered tree.
However, don’t panic yet!
Many of our trees this year have been stressed due to weather and are experiencing symptoms of yellowing and dieback. It is possible that this may be occurring.
For a definitive diagnosis, please send a sample to the MSU lab. Here is a link to that site with instructions. https://www.canr.msu.edu/pestid/
So sorry about your tree!
Redbuds are susceptible to Verticillium wilt (especially in wet sites) and Botryosphaeria canker which would produce dieback on the branches.
The first external signs that a tree has a Verticillium Wilt infection is the yellowing and then browning of leaves at the ends of some branches. Initially the yellowing and browning of the leaves is spotty throughout the tree and does not follow a uniform pattern. As the fungus begins to block the vascular system, the browning of leaves becomes more acute and more wide-spread. New leaves generally are either non-existent, undersized or yellowed.
Botryosphaeria canker, a common disease among redbuds, is a fungal disease that enters twigs and branches, feeds on the living tissue below the bark, and spreads around the stem. Once it encircles the branch, the water supply beyond that point is cut off to the leaves. The branch will suddenly wilt and die. Redbuds that are under drought stress will more easily succumb to Botryosphaeria canker than a well-watered tree.
However, don’t panic yet!
Many of our trees this year have been stressed due to weather and are experiencing symptoms of yellowing and dieback. It is possible that this may be occurring.
For a definitive diagnosis, please send a sample to the MSU lab. Here is a link to that site with instructions. https://www.canr.msu.edu/pestid/
