Of 78 compounds screened in laboratory investigation to determine the effectiveness of sorptive dusts for killing and controlling cockroches, two compounds, a silica aerogel designated as SG 67–Dri-Die 67–and a silica gel called SG 77 were outstandingly effective.

The above progress report is based on Research Project No. 1642-A.

Walter Ebeling, Professor of Entomology, University of California, Los Angeles, conducted the exeriments with sorptive dusts for the control of drywood termites.