Positive/negative ion plasmas, composed of Ba+, SF6−, and residual electrons, were observed to display characteristics of strong turbulence. Experiments on the UCI Q machine linked the presence of negative ions (and the depletion of electrons) with large density fluctuations (&dgr;n/n&bartil;1), large‐amplitude, low‐frequency electrostatic noise (f≤20 kHz), and rapid transport of ions across magnetic field lines (D⊥&bartil;104cm2/sec). Ion velocity distributions were heated parallel to and cooled perpendicular to the confining magnetic field. The partial pressure of gaseous SF6was shown to serve as a regulator of plasma turbulence. Turbulence levels could be smoothly varied from quiescent states (&dgr;n/n&bartil;0.01) to strongly turbulent states (&dgr;n/n&bartil;1).