The derivation of the ponderomotive force due to neutrinos by Hardy and Mel
rose [Phys. Rev. D 54, 6491 (1996)] is based on a flawed analysis of the po
nderomotive force concept. Their conclusions also contain an erroneous phys
ical assumption related to the neutrino emission in supernovae. A correct a
nalysis shows the importance of the ponderomotive force due to neutrinos in
type II supernovae explosions. [S0556-2821(99)04416-1].