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1 August 2007 Baseline Responses of Alphitobius diaperinus (Coleoptera: Tenebrionidae) to Spinosad, and Susceptibility of Broiler Populations in Eastern and Southern Australia
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Abstract

Spinosad was proposed as a potential chemical for control of lesser mealworm, Alphitobius diaperinus (Panzer) (Coleoptera: Tenebrionidae), in Australian broiler houses after the detection of strong cyfluthrin resistance in many beetle populations. In 2004–2006, spinosad susceptibility of 13 beetle populations from eastern and southern Australian broiler houses and a cyfluthrin/fenitrothion-resistant reference population was determined using topical application, and was compared with the susceptibility of an insecticide-susceptible reference population. Comparisons of dose–response curves and baseline data showed that all populations, including the insecticide-susceptible population, were roughly equivalent in their response to spinosad, indicating no preexisting spinosad resistance. Two field populations, including the resistant reference population, which had confirmed cyfluthrin/fenitrothion-resistance, showed no cross-resistance to spinosad. There was no significant correlation between beetle weight and LC99.9. A discriminating concentration of 3% spinosad was set to separate resistant and susceptible individuals. Considering the levels of spinosad resistance that have been recorded in other insect pests, the sustained future usefulness of spinosad as a broiler house treatment will rely on effective integrated beetle management programs combined with carefully planned chemical use strategies.

Trevor A. Lambkin and Steven J. Rice "Baseline Responses of Alphitobius diaperinus (Coleoptera: Tenebrionidae) to Spinosad, and Susceptibility of Broiler Populations in Eastern and Southern Australia," Journal of Economic Entomology 100(4), 1423-1427, (1 August 2007). https://doi.org/10.1603/0022-0493(2007)100[1423:BROADC]2.0.CO;2
Received: 25 October 2006; Accepted: 14 February 2007; Published: 1 August 2007
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