  We study the effect of a possible fourth heavy generation of fermions on the
Higgs sector of the standard model. We show, from the violation of elastic
unitarity, that the scale of strong interactions is well below 1 TeV even with
a Higgs mass as low as 500 GeV provided the fourth generation fermion mass is
equal or larger than the Higgs mass. The diagonal Pade approximant method is
then used to unitarize the partial wave amplitudes. It is found that, for the
fourth generation fermion masses which are comparable to or larger than the
Higgs mass, the Landau ghosts in the I=0 and I=2 channels of the reconstructed
amplitudes move too close to the physical region to be accepted.
