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The decay $D^0 \to \pi^+ \pi^- \pi^0$ appears to be dominated by $\rho \pi$states in a configuration of zero total isotopic spin. The spin $J$, parity$P$, and charge-conjugation eigenvalue $C$ of this final state are therefore$J^{PC} = 0^{--}$, which cannot be formed of a quark $q$ and antiquark $\barq$. If a resonance near $M(D^0)$ dominates the final state, it must be a {\ithybrid} composed of a quark-antiquark pair and a constituent gluon, or a {\ittetraquark} $q q \bar q \bar q$. A test for this resonance in electroproductionis proposed.

Test for exotic isoscalar resonance dominating $D^0 \to \pi^+ \pi^- \pi^0$ decays