The mold mite, Tyrophagus putrescentiae (Schrank), is a stored product pest of economic significance that commonly infests many types of food and animal feed products. There is limited information regarding pest management tactics, including residual acaricides for managing this pest in retail store habitats. The purpose of this study was to assess the potential of commercially available acaricides that could provide a protective barrier near susceptible food packages destined for consumer use. Mite mortality at 24 and 48 h was measured after exposing mites to acaricide residues applied to a nonporous surface. Two additional factors included in the study were humidity and the presence of an adjuvant to facilitate spread of acaricide on nonporous surfaces. Increasing humidity levels generally decreased acaricide efficacy. Use of the adjuvant itself did not appear to affect efficacy, but the type of application (wet or slurry, or dry) of dust acaricides significantly affected efficacy. The potential for residual acaricides to act as abarrier (within 24–48 h) against dispersal of this mite was discussed.
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Vol. 106 • No. 4