Some of the leaves on some of the branches of the trunk are a light green (almost yellow) and not dark green as the other leaves on the tree. What can I do to correct this. It is a 4 clump River Birch approximately 30 years old and sits in clay.
End of April, I applied Bayer Tree and Shrub Protect and Feed, as I do every year.
How can I help the tree. I just love it and don't want to lose it.
THANK YOU - Jean