No fruit on mature peach tree
I live in Jacksonville FL. I planted a peach tree(white flesh-not exactly sure of name) that I planted in 2000. The tree bore a large crop in 2003 and a much smaller one in 2004. Since then, the tree has had no fruit:( I have pruned the tree to the required bowl shape and also so it does not get too tall. It does produce small muted flowers every year that produce a few small fruits(marble-size) that fall off. I need help determing what I can do to produce fruit. Some of the smaller branches do have a black residue on it that I can vigorously rub off. The tree is very healthy in the summer. The leaves are currently all off the tree as it is in a dormant state. Please help.