Morris G. Cline
http://rycomusa.com/aspp2000/public/P40/0084.html
There has been some confusion in the use of the terms "apical dominance" and "apical control." In the strict sense, apical dominance is the control exerted by the shoot apex over the outgrowth of lateral buds lower on the shoot. In 1967, Brown suggested in woody plants that apical dominance should only be applied to the current year's twig growth. He introduced the term "apical control" to describe the influence of apical portions of a tree crown over perennial branching and general tree form. This term has been widely accepted and employed with considerable latitude for woody species. Apical control refers generally to the suppression of one elongating branch by a higher more vigorously growing branch. In contrast, apical dominance is concerned primarily whether or not an inhibited lateral bud (under the influence of the growing shoot apex) will begin to grow out. Both terms refer to correlative phenomena involving signals operating over long distances to suppress branch growth, the latter, at a very early stage and the former, at a later stage.