Found greasy spot on my Myers Lemon. I'm in coastal SC. With winter coming on what should I do, if anything? This is a young tree about 3' planted last March. Just showed up a week ago.
Also it looks like a magnesium deficiency, green V at base of leaf. Both only on the Myers.
Thanks

The primary problem caused by greasy spot is defoliation, and yield reduction. . The first thing to do is rake up all the dead fallen leaves under and near the tree, as the greasy spot pathogen develops on the fallen leaf debris. Copper fungicides work well against greasy spot. - Millet (1,149-)

Should I spray now? How much?

combahee,The long period required for development of the epipytic growth and infection make greasy spot a relatively easy disease to control, and spray timing is flexible. Timing of application s is not critical. In high rainfall areas, the disease cycle continues year around. Spray applications are also done to protect each major flush. When spraying with a copper fungicide follow label directions for application rates. (taken from the Compendium of Citrus Diseases) - Millet (1,149-)