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Evaluation of Potential Insecticides for Controlling German Cockroaches, 1986


 Field tests were conducted to determine the relative effectiveness of self-pressurized sprays containing 1 of 2 concentrations of cyfluthrin or 1 concentration of an avermectins bait or dusttype baits of avermectins, boric acid, or fenoxycarb. MaxForce™ (hydramethylnon) bait and a self-pressurized spray of 0.5% chlorpyrifos, both labeled for cockroach control, were used as standards. Dry baits were applied with a Getz™ or Controlbulb™ duster. MaxForce was used as sold to homeowners; the self-pressurized formulations were applied as supplied by Whitmire Research Laboratories, St. Louis, Mo. All formulations were applied to cracks and crevices, except the MaxForce bait stations, which were attached to kitchen surfaces as directed by the label. Single-family houses located in Sampson County, N.C., served as test sites. Only houses with a minimum of 25 cockroaches sighted in a preliminary survey of the kitchen were used. Visual counts in the kitchen before the initial application and at specified intervals afterward determined the percent reduction in cockroach populations. The amount of insecticide for kitchen applications was recorded. No additional MaxForce stations were placed in the MaxForce test houses after the initial application. Other rooms in all test houses were treated, but cockroach numbers and amount of insecticide applied were not measured. Each formulation was replicated 5 times. Analyses were calculated on percent reduction of cockroaches (pre- versus postcounts for a house) using a general linear models procedure and the Goodnight [1982] Waller-Duncan K-ratio t test for variables. The combined wall and floor surfaces in the kitchens ranged from 35 to 90 m2 with a mean of 55 m2. The active ingredient applied in the initial application and during reapplications ranged from 0.007 to 4.2 g and from 0.0 to 1.4 g, respectively, for 50 m2 of kitchen floor and wall surfaces. Smaller quantities of insecticide were used for the reapplications because partial cockroach control had resulted in most of the dwellings.