Chlorpyrifos resistance in German cockroaches (Dictyoptera: Blattellidae) from restaurants
1991
Rust, M.K. | Reierson, D.A.
Visual inspections and trapping revealed the presence of German cockroaches, Blattella germanica (L.), in 62 of 100 randomly selected commercial food-handling establishments. From live cockroaches trapped in 55 restaurants, 3.5 strains were established and tested for chlorpyrifos resistance. Poor sanitation and the likelihood of trapping cockroaches were associated. Twenty strains had resistance ratios (RR) at LD50 > 10-fold, a value exceeding the pest management threshold level for this insecticide. Resistance ratios were not associated with numbers of cockroaches trapped, the level of sanitation, numbers of different insecticide products used, or the number of treatments per month. Significantly more categories of insecticides (e.g., carbamate, organophosphate, inorganic) were used in restaurants with RR >10 than in those with RR <10.
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