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1 February 2000 Laboratory and Field Performance of an Imidacloprid Gel Bait Against German Cockroaches (Dictyoptera: Blattellidae)
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Abstract

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.

A. G. Appel and M. J. Tanley "Laboratory and Field Performance of an Imidacloprid Gel Bait Against German Cockroaches (Dictyoptera: Blattellidae)," Journal of Economic Entomology 93(1), 112-118, (1 February 2000). https://doi.org/10.1603/0022-0493-93.1.112
Received: 17 June 1999; Accepted: 1 September 1999; Published: 1 February 2000
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