Burr Oak dropping leaves - Ask Extension
1) Our nice burr oak is dropping leaves . Most are slightly eaten on edges . My guess is scale // ??
Can I spray —- with what?? Thank ...
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Burr Oak dropping leaves #648204
Asked June 09, 2020, 10:22 AM EDT
1) Our nice burr oak is dropping leaves . Most are slightly eaten on edges . My guess is scale // ??
Can I spray —- with what?? Thank you !!
2) sorry second question — About 25 year old white pine is ‘’browning ‘’ it’s needles . I don’t see any bugs/ rust ,,etc.. Anything I can do ??
Washington County Minnesota
Expert Response
Thank you for writing.
I am sorry the pictures are just not clear enough.
One possibility center picture is Oak Leaf Gall https://hortnews.extension.iastate.edu/2010/8-25/oakgalls.html#:~:text=These%20growths%20are%20known%20as,by%20small%20wasps%20or%20midges.
Oak wilt is the worst case scenario. https://extension.umn.edu/plant-diseases/oak-wilt-minnesota#how-is-the-oak-wilt-fungus-spread%3F-1258961
This pamphlet on Oak Diseases may give you a better idea. http://www.myminnesotawoods.umn.edu/wp-content/uploads/2015/03/HowToRecognizeCommonDiseasesOaks.pdf
In any case a large oak is valuable. Consider calling a qualified arborist. https://extension.umn.edu/planting-and-growing-guides/how-hire-tree-care-professional
In the case of the pine, I need a close up of the needles and two small branching points. Blister rust would be the most common https://extension.umn.edu/plant-diseases/white-pine-blister-rust but Cytospora Canker, commonly thought of as a Colorado spruce disease also affects white pine. https://extension.umn.edu/plant-diseases/cytospora-canker
I am sorry the pictures are just not clear enough.
One possibility center picture is Oak Leaf Gall https://hortnews.extension.iastate.edu/2010/8-25/oakgalls.html#:~:text=These%20growths%20are%20known%20as,by%20small%20wasps%20or%20midges.
Oak wilt is the worst case scenario. https://extension.umn.edu/plant-diseases/oak-wilt-minnesota#how-is-the-oak-wilt-fungus-spread%3F-1258961
This pamphlet on Oak Diseases may give you a better idea. http://www.myminnesotawoods.umn.edu/wp-content/uploads/2015/03/HowToRecognizeCommonDiseasesOaks.pdf
In any case a large oak is valuable. Consider calling a qualified arborist. https://extension.umn.edu/planting-and-growing-guides/how-hire-tree-care-professional
In the case of the pine, I need a close up of the needles and two small branching points. Blister rust would be the most common https://extension.umn.edu/plant-diseases/white-pine-blister-rust but Cytospora Canker, commonly thought of as a Colorado spruce disease also affects white pine. https://extension.umn.edu/plant-diseases/cytospora-canker
Thank you very much for your response .. Sorry for poor pics.... Tree is very healthy — except for recent leaf issues .. Took some ,,I hope ,, better photos..
not sure what is happening to the nice pine —- bummer
Again, Thxs so much for your time and expertise ...
Jack St. Ores
Baytown
not sure what is happening to the nice pine —- bummer
Again, Thxs so much for your time and expertise ...
Jack St. Ores
Baytown
Thank you very much for your response .. Sorry for poor pics.... Tree is very healthy — except for recent leaf issues .. Took some ,,I hope ,, better photos..
not sure what is happening to the nice pine —- bummer
Again, Thxs so much for your time and expertise ...
Jack St. Ores
Baytown
not sure what is happening to the nice pine —- bummer
Again, Thxs so much for your time and expertise ...
Jack St. Ores
Baytown
Fascinating.
The oak problem appears to be a twig gall--see those bumpy things at the twig just before it gets to the leaf. http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/other/galls/gouty-horned-and-other-twig-galls.aspx
I can not find anything on management but the literature suggests the tree will survive. I suggest you call an arborist per info given in my first post.
With regard to the pine--should a picture of the needles and twig branching from 6 inches away.
The oak problem appears to be a twig gall--see those bumpy things at the twig just before it gets to the leaf. http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/other/galls/gouty-horned-and-other-twig-galls.aspx
I can not find anything on management but the literature suggests the tree will survive. I suggest you call an arborist per info given in my first post.
With regard to the pine--should a picture of the needles and twig branching from 6 inches away.
Steve,,
thanks again... In another life ,,was deep into biology —- education / work . So , find your support very helpful .. We live in a wonderful area — 8 acres ,, pond / small lake = Almost a wildlife preserve . My wife is an officer in local Stillwater garden club —- they volunteer gardens in area ,, like by the hospital.
I understand some type or ‘’oil ‘’ spay in the Fall helps with this gall — will investigate ..Have 7 100+ year old white oaks I need to protect ....
Be safe
thanks again... In another life ,,was deep into biology —- education / work . So , find your support very helpful .. We live in a wonderful area — 8 acres ,, pond / small lake = Almost a wildlife preserve . My wife is an officer in local Stillwater garden club —- they volunteer gardens in area ,, like by the hospital.
I understand some type or ‘’oil ‘’ spay in the Fall helps with this gall — will investigate ..Have 7 100+ year old white oaks I need to protect ....
Be safe
You as well.
It was peaceful out there today
It was peaceful out there today
