  The predictions of an isospin model are compared with the branching ratios of
the 5 and 6 pion decays of the tau lepton. In both cases, the isospin model
suggests that the tau favours decays in which there is an omega resonance.
Recent measurements of such tau decays confirm this hypothesis. If the decay of
the tau to 7 pions also proceeds through an intermediate omega, then the
isospin model predicts that the branching ratio of the tau to seven charged
pions should be small when compared with other 7 pion decays. New limits on
this mode appear to support this argument.
