Question
About two months ago I planted the tree. The leaves were a very deep green. The plant has several fruit about the size of a golf ball. The fruit appear to be growing. The trunk of the tree is about 1 1/2 inch in diameter. Some of the leaves are now displaying a dull yellow color mixed in with the green. About 1/2 of the trees leaves are affected in this way. I water once a week now, I was watering twice a week. Do you have a solution? Thank you

Answer
Hi Gerry,

Yellowing Leaves
Yellow leaves can be a result of several things. It could be a result of lack of fertilizer and minerals, a watering problem, or insect damage. When diagnosing a problem, take into account how often you water, when and how often you fertilize, and when the last time you inspected your tree for insects. If the older leaves are turning yellow and the other leaves are a pale green, then you may need to add nitrogen. If the leaves are yellowing, but the veins on the leaves are green, then your citrus most likely needs iron. If the outer leaves are yellowing and some of the branches are dying back, the citrus may be getting too much water. Inspect the soil to see how moist the soil is. Leaves that are being damaged by insects will also turn yellow. Inspect the leaves, especially the backside of the leaves to look for insects. Mites are hard to detect and look like small dots on the backside of the leaves. Make sure you have nothing like mulch, grass, plants, etc. under your tree as it needs to dry out in between waterings.  The roots are high in the soil.  Minimum watering should be 3 1/2 inches per week.  kathy