Insecticide Sprays, 1993

Abstract

Abstract Kitchens in single family dwellings located in Harnett, Johnston, Sampson and Wake counties, NC served as test sites. Five kitchens with a minimum of 100 living German cockroaches sighted during a preliminary visual survey were assigned to each formulation. Preapplication visual tallies of living cockroaches in kitchens compared to tallies at specified intervals after treatment indicated efficacy. Formulations, supplied by Whitmire Research Laboratories, Inc., St. Louis, were applied from self-pressurized, aerosol-type containers into cracks and crevices. Nontest rooms in the dwellings were treated with the formulation as needed at each visit to minimize possible migration of German cockroaches into treated areas. Insecticide reapplications were made at 2, 4 and 8 wk only in kitchens and other rooms where any living cockroaches were observed during postapplication tallies. The amount of insecticide applied during the initial application and reapplications and the size, temperature, and relative humidity of the kitchens were recorded. Analyses were based on % reduction of cockroaches (pre- vs post-treatment tallies for a kitchen). Since the area of individual kitchen floor and wall spaces varied, the active ingredient applied per kitchen was converted to a 50 m2 basis for comparative purposes. The active ingredient applied in the initial applications for all formulations ranged from 0.01 to 6.3 g and from 0.0 to 3.7 g for the reapplications, respectively. Smaller quantities of insecticide were used for the reapplications because of partial cockroach control from the initial applications.