Your article mentions fungal diseases of sycamore trees, but not how to treat them. I live on one of those older streets with large and aged sycamores and they look awful most of the year. Is there a FERTILIZER or SYSTEMIC treatment that might help these poor bedraggled trees?
Certified GKH Gardening Expert
Personally, I use wettable sulfur to control fungus issues. Rosemary oil, lavender oil, and garlic extract can help in many cases. This article will help:https://www.gardeningknowhow.com/ornamental/trees/sycamore/sycamore-tree-problems.htm