Swamp White Oak Leaves Turning Yellow - Ask Extension
Hi,
In the last couple of weeks, the leaves of our swamp white oak are turning yellow. The swamp white oak was planted two years ago and was abou...
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Swamp White Oak Leaves Turning Yellow #802424
Asked July 22, 2022, 9:20 AM EDT
Hi,
In the last couple of weeks, the leaves of our swamp white oak are turning yellow. The swamp white oak was planted two years ago and was about 8 feet tall when purchased. Are the leaves turning yellow due to a lack of water? Also, one of the pictures shows holes in the leaf and also some ants crawling around on the leaf. Is the tree stressed? Is there anything I should do?
Thanks, John
Olmsted County Minnesota
Expert Response
Leaves may turn yellow if the soil pH is too high. A soil test will confirm this. See:
https://soiltest.cfans.umn.edu/
Holes in leaves can come from a variety of pests. The following website shows you what to look for.
https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/oak/leavesholes.html
Ants are usually a sign that aphids are present. Ants are attracted to the honey like substance excreted by aphids.
https://extension.umn.edu/yard-and-garden-insects/aphids
https://soiltest.cfans.umn.edu/
Holes in leaves can come from a variety of pests. The following website shows you what to look for.
https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/oak/leavesholes.html
Ants are usually a sign that aphids are present. Ants are attracted to the honey like substance excreted by aphids.
https://extension.umn.edu/yard-and-garden-insects/aphids
