An articulating mower deck system. The system is adapted to disable power to a blade associated with the wing deck section before the wing deck section begins to lift—；from an operating position toward a folded position—；yet does not interfere with blade operation when the wing deck section floats relative to a center deck section during normal operation of the deck. Articulating decks of modular construction are also provided, allowing assembly of multiple deck widths with a minimum of modular deck sections.
