Actually, if you keep them in the freezer for longer than a week, you
can also kill the eggs and larvae. A very useful paper to check is:
Strang, T.J.K. 1992. A review of published temperatures for the
control of pest insects in museums. Collection Forum 8(2):41-67
Collection Forum is the journal of the Society for the Preservation
of Natural History Collections (SPNHC).
John Simmons
Natural History Museum
University of Kansas