  The bulk viscosity, $\zeta$ and its ratio with the shear viscosity,
$\zeta/\eta$ have been studied in an anisotropically expanding pure glue plasma
in the presence of turbulent color fields. It has been shown that the
anisotropy in the momentum distribution function of gluons, which has been
determined from a linearized transport equation eventually leads to the bulk
viscosity. For the isotropic (equilibrium) state, a recently proposed
quasi-particle model of pure SU(3) lattice QCD equation of state has been
employed where the interactions are encoded in the effective fugacity. It has
been argued that the interactions present in the equation of state,
significantly contribute to the bulk viscosity. Its ratio with the shear
viscosity is significant even at $1.5 T_c$. Thus, one needs to take in account
the effects of the bulk viscosity while studying the hydrodynamic expansion of
QGP in RHIC and LHC.
