Sooty Mold on Citrus Trees
I live in San Diego and have several citrus trees in the ground. They have a whole loy of sooty mold from ants and aphids. What specific product can I use to control them that will not affect the fruit? Of course, I would like to apply as few times per year as possible.
A whole bunch of mexican guys have recommended painting the base of the tree with some sort of white stuff to control the ants, but nobody seems to know what it is or where to get it. Does anybody know?