Knowledgebase
Discolored leaves #877184
Asked July 14, 2024, 5:17 PM EDT
Ramsey County Minnesota
Expert Response
It is not likely your newly planted fruit trees will have the issue as your lilac.
In addition, your hollyhock likely has rust. This is evident in the photo with the orange, dust-like substance on the leaves. https://extension.umn.edu/plant-diseases/rust-flower-garden Rust must be treated in its very early stages. Once established it is not treatable. When the plant is done growing clean up all debris and throw in trash.
Leaf Spot Diseases
https://extension.umn.edu/plant-diseases/leaf-spot-diseases-trees-and-shrubs#leaf-spots-and-shoot-blight-or-canker-1156510
How to Prune a Lilac
https://video.maine.edu/media/How+to+Prune+a+Lilac+Bush/1_1w8x1rwv
Dear David,
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YOUR QUESTION #0147102:
Discolored leaves
My lilacs look awful with dry brown leaves. Nearby are hollyhocks that also are looking diseased. What is this? Same thing? I’m concerned about 4 new trees I planted nearby this year. 3 northstar cherries and a crabapple. Don’t want them getting sick. Thanks.Ask Extension offers one-to-one expert answers from Cooperative Extension/University staff and volunteers within participating Land-Grant institutions across the United States.
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Verticillium wilt is caused by a fungus. It impacts branches by inhibiting the ability for moisture to flow throughout the shrub/tree. Testing in your branches is the best way to determine if the shrub has verticillium wilt. Below is a link with information about this fungus as well as information about the plant disease testing.
Verticillium Wilt
https://hort.extension.wisc.edu/articles/verticillium-wilt-of-trees-and-shrubs/
Plant disease clinic
https://pdc.umn.edu/