I have two black walnut trees that have leaves with black spots. Help?
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Reb10058229
has anyone an idea what is the problem and is there anything I what I can do to help them?
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Be careful working with black walnut. They make the soil around them toxic by 5 times the size of the crown of the tree. No water bearing vegetables or fruits can grow in their vicinity without becoming a biotoxin. California has a nice website to aid in treating trees with disease: http://www.treesolutions.com/tree-management/insects-plant-diseases/
Good luck with it.
https://ask.extension.org/questions/202663