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30 years experiance in the ID and management of forest diseases and ID of landscape tree diseases.
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Sounds like Magnolia scale, an insect. This small insect lives in a scale and sucks the plant juices from the tree. It deposits a sticky substance called honeydew and a fungus called sooty mold grows on
With heavy rain, water works its way through the bark, especially towards the tops of the trees, to the wood underneath. As it runs down towards the base, between the bark and the trunk, it collects some
This being a river birch, there should not be a problem with the roots. You should not have a problem with root damage from a river birch--their root system is fibrous and I could find no one who has
Hardwood trees especially oaks have a tendency to sprout water shoots when planted as single open grown trees. This sprouting is the result of the sunlight hitting the trunk and the buds on the trunk
There are several things going on with your tree. First the blue and red insect is a Golden raintree bug. And the twig problem is the Black twig borer. First the twig borer. The black twig borer, Xylosandrus

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