Burr Oak - Ask Extension
Would like to know what is wrong with my Burr Oak.
Knowledgebase
Burr Oak #872213
Asked June 08, 2024, 4:41 PM EDT
Would like to know what is wrong with my Burr Oak.
Arapahoe County Colorado
Expert Response
Hello there and thank you for using Ask Extension.
Based upon your photo, it appears to be the beginning stages of oak leaf blister. Here is some information about it.
https://planttalk.colostate.edu/topics/insects-diseases/1449-oak-leaf-blister/
For most oak trees, it is not anything to worry about. However, if a large part of your tree is infected, you should consider having it sprayed next spring before bud break. There is nothing you can do about it at this time. The fungus is active and there is no control for it during the summer.
Oak leaf blister can increase the stress on the tree which would leave it vulnerable to other pests. To avoid this, water your tree appropriately, prune it when needed, and be on the lookout for other pests that may attack it.
Here's an additional fact sheet on winter watering. It is important to water your tree, in fact your entire landscape, in the fall/winter if we have a dry spell. Landscape plants need 1 inch of water per month during the fall/winter. If we have a month where less than 1 inch of melted snow falls, you should add supplemental watering. Here's the fact sheet.
https://extension.colostate.edu/topic-areas/yard-garden/fall-and-winter-watering-7-211/
Let me know if you have further questions.
Based upon your photo, it appears to be the beginning stages of oak leaf blister. Here is some information about it.
https://planttalk.colostate.edu/topics/insects-diseases/1449-oak-leaf-blister/
For most oak trees, it is not anything to worry about. However, if a large part of your tree is infected, you should consider having it sprayed next spring before bud break. There is nothing you can do about it at this time. The fungus is active and there is no control for it during the summer.
Oak leaf blister can increase the stress on the tree which would leave it vulnerable to other pests. To avoid this, water your tree appropriately, prune it when needed, and be on the lookout for other pests that may attack it.
Here's an additional fact sheet on winter watering. It is important to water your tree, in fact your entire landscape, in the fall/winter if we have a dry spell. Landscape plants need 1 inch of water per month during the fall/winter. If we have a month where less than 1 inch of melted snow falls, you should add supplemental watering. Here's the fact sheet.
https://extension.colostate.edu/topic-areas/yard-garden/fall-and-winter-watering-7-211/
Let me know if you have further questions.
Hi Jeff, Just wanted to thank you for the reply and the information. It is much appreciated!
Cindy Henderson
