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Laboratory and Field Performance of an Imidacloprid Gel Bait Against German Cockroaches (Dictyoptera: Blattellidae)

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An experimental 2.15% imidacloprid gel bait containing ≈44% water was evaluated in laboratory and field studies against the German cockroach, Blattella germanica (L.). In continuous exposure tests, toxicity and presumably bait consumption varied with cockroach stage, deprivation of competitive food, and temperature. The LT50 values for cockroaches provided with competitive food ranged from ≈0.9 h for adult females to 190 h for small nymphs. The LT50s for cockroaches not provided competitive food ranged from ≈1.7 h for adult females to ≈31 h for adult males. The LT50s decreased exponentially with temperature between 10 and 30°C. Even though the bait was significantly more repellent (≈38%) than an untreated control (≈14%) when tested in Ebeling choice boxes, performance index values were positive and increased to nearly 100 (indicating high mortality and low repellency) after 14 d. When applied at 15–45 g per kitchen, the bait significantly reduced German cockroach trap catch in infested homes during a 4-wk period. There was a ≈50% reduction after 1 wk and ≈80% reduction 4 wk after treatment.

Keywords: Blattella germanica; Ebeling choice box; field performance; imidacloprid; insecticidal bait; toxicity

Document Type: Research Article

DOI: http://dx.doi.org/10.1603/0022-0493-93.1.112

Publication date: February 1, 2000

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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