  Type II radio bursts are observed in the Sun in association with many coronal
mass ejections (CME's. In view of this association, there has been an
expectation that, by scaling from solar flares to the flares which are observed
on M dwarfs, radio emission analogous to solar Type II bursts should be
detectable in association with M dwarf flares. However, several surveys have
revealed that this expectation does not seem to be fulfilled. Here we
hypothesize that the presence of larger global field strengths in low-mass
stars, suggested by recent magneto-convective modeling, gives rise to such
large Alfven speeds in the corona that it becomes difficult to satisfy the
conditions for the generation of Type II radio bursts. As a result, CME's
propagating in the corona/wind of a flare stars are expected to be
"radio-quiet" as regards Type II bursts. In view of this, we suggest that, in
the context of Type II bursts, scaling from solar to stellar flares is of
limited effectiveness.
