Cavitation in liquid helium was induced using an ultrasonic cylindrical transducer resonant at approximately 57 kHz. Interaction of the sound field with superfluid helium during cavitation runs was studied using a low‐power second‐sound signal. This signal was observed to decay when a voltage whose amplitude increased linearly with time was applied to the ultrasonic transducer. This is interpreted as being due to the growth of turbulence in the liquid. It is contended that for the sound field to induce cavitation, the liquid has to be in a state of turbulence. It is possible that there is a threshold for additional attenuation of the second‐sound signal near the onset of cavitation. Some cavitation runs were also made in the presence of a high‐power second‐sound current. Under these circumstances turbulence was generated, either by the second‐sound field or by the associated steady heat current. This turbulence lowered the cavitation threshold.Subject Classification:[43]25.60; [43]35.32, [43]35.47.