Removing menu from menu bar

[Stephen Berman]

Is it possible to remove menues from the menu bar that a mode defines,
without modifying the source code, but rather using a hook, advice, or
some other device that doesn't touch the source?  For example, if
xyz-mode defines menues xyz1 and xyz2, can I replace them by a menu xyz
without altering the source code?  I'm particularly interested in the
case where the mode defines the menues using easymenu.el.  I'd be
grateful for any suggestions, code snippets, etc.

Steve Berman