WHAT IS GOING ON WITH MY TREE? Chlorosis (yellowing of the leaves) is a condition that we often see in our area in our maples, red oaks, bald cypress, sweet gums, river birch and ornamental pear trees. Iron chlorosis is fatal to trees if it is left untreated for multiple seasons. Each year that the leaves are chlorotic, they are unable to absorb sunlight sufficiently, therefore the leaves cannot produce the glucose that the trees need to sustain the overall health and vigor o