  In minimal SUSY-GUT models with $M_{SUSY}\ltap 1$ TeV, the renormalization
group equations have a solution dominated by the infrared fixed point of the
top Yukawa coupling. This fixed point predicts $m_t=(200\; {\rm GeV})\sin \beta
$; combined with the LEP results it excludes $m_t\ltap 130$ GeV. For $m_t$ in
the range 130-160 GeV, we discuss the sensitivity of the $m_t$ fixed point
result to GUT threshold corrections and point out the implications for Higgs
boson searches. The lightest scalar $h$ has mass 60-85 GeV and will be
detectable at LEPII. At SSC/LHC, each of the five scalars $h$, $H$, $A$,
$H^{\pm }$ may be detectable, but not all of them together; in one parameter
region none will be detectable.
