Abstract: A cross arm apparatus for providing structural support in agricultural and other applications. The cross arm comprises a folded section adjacent one edge, a bent, angled or beveled section adjacent a another edge, and a generally planar section or region extending between the folded section and angled section. Slotted catch holes in the ends of the cross arm provide for releasibly attaching wires to the cross arm. Notches and holes in the cross arm allow the cross arm to be attached to other structural elements such a vertical supports or additional cross arms. The cross arm can be assembled with a vertical support and additional cross arms to provide a variety of trellis structures.