  Parity violating (PV) contributions due to interference between $\gamma$ and
$Z^0$ exchange are calculated for pion electroproduction off the nucleon. A
phenomenological model with effective Lagrangians is used to determine the
resulting asymmetry for the energy region between threshold and $\Delta(1232)$
resonance. The $\Delta$ resonance is treated as a Rarita-Schwinger field with
phenomenological $N \Delta$ transition currents. The background contributions
are given by the usual Born terms using the pseudovector $\pi N$ Lagrangian.
Numerical results for the asymmetry are presented.
