Hi there! I have two thin weeping willows in my yard that are not full, and whose leaves are turning light green and yellow with spots. Is this a mere iron deficiency or should I be concerned about something more dire? - from a homeowner near St. Louis, Missouri who contacted me on Facebook. I tried to refer him to this site, but he said it wouldn’t take his question. Can you refer this to someone on OSU Extension ENLT? Thank you.