  We study the QCD phase diagram at finite temperature and baryon chemical
potential by relating the behavior of the light-quark condensate to the
threshold energy for the onset of perturbative QCD. These parameters are
connected to the chiral symmetry restoration and the deconfinement phase
transition, respectively. This relation is obtained in the framework of finite
energy QCD sum rules at finite temperature and density, with input from
Schwinger-Dyson methods to determine the light-quark condensate. Results
indicate that both critical temperatures are basically the same within some 3%
accuracy. We also obtain bounds for the position of the critical end point,
mu_{B c} >~ 300 MeV and T_c <~ 185 MeV.
