  The observation of $\pi_1(1600) \to \pi \rho$ is shown in the flux-tube model
to be compatible with this state being a hybrid meson with branching ratio to
this channel $\sim 30%$. The $\pi \rho$ widths of other hybrids are related by
rather general arguments. These results enable cross sections for
photoproduction of hybrids to be predicted.
