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Effects of Two Temperature Storage Regimes on the Efficacy of 3 Commercial Gel Baits against the German Cockroach, Blattella germanica L. (Dictyoptera: Blattellidae)



Effects of Two Temperature Storage Regimes on the Efficacy of 3 Commercial Gel Baits against the German Cockroach, Blattella germanica L. (Dictyoptera: Blattellidae)



Iranian Journal of Public Health 39(3): 102-108



To compare the effectiveness of 3 commercial gel bait formulations containing fipronil (Goliath(©) Cockroach Gel 0.05% AI), chlorpyrifos-A (Clean Bait(©) Gel, 2% AI), and chloropyrifos-B (Serpa(©) Gel 2% AI) against German cockroaches (Blattella germanica) when stored at 23(°)C and 30(°) C after treatment. Laboratory bioassays consisted of placing groups of fifteen cockroaches (a random combination of adult, mixed sex and large nymphs-stage 6) into a 5 L cylindrical plastic container with one drop of product (avg 0.10 g ± 0.01 g) applied to a 76 mm x 26 mm glass microscope slide affixed to the bottom of each container (one product tested per container). Cumulative mortality was assessed at 6 h, 1, 2, 3, 4, and 5 d after application. To determine the further effects of storage temperature after treatment on residual activity of the gels, a drop of each product was applied to separate glass microscope slides and stored at either 23(°) C (warm) or 30(°) C (hot) under dark conditions for 0, 1, 7, 14, 30, 45, 60 and 90 d after application. Freshly applied baits (day 0) containing fipronil provided complete cockroach mortality (100%) within 5 d whereas chloryrifos-A and chlorpyrifos-B provided ≈72% and 88% mortality, respectively. Generally, cockroach mortality was greater when gels were stored at 30(°)C compared with 23(°) C. The fipronil gel formulation proved to be as efficacious as the chlorpyrifos gels and in some instances surpased the latter formulations depending on storage time and temperature by providing ≈90% mortality at 90 d post treatment.

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Accession: 052850987

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PMID: 23113028


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