AI Article Synopsis
- Spinosad was tested as a control method for the lesser mealworm in Australian broiler houses, especially after many populations showed resistance to cyfluthrin.
- Over the period from 2004 to 2006, spinosad susceptibility was analyzed in multiple beetle populations, revealing that none displayed prior resistance, and two resistant populations to other insecticides showed no cross-resistance to spinosad.
- For long-term effectiveness of spinosad, it’s crucial to implement integrated management strategies and strategic chemical application to prevent the development of resistance.
Article 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 LC9.9. 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.
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| http://dx.doi.org/10.1603/0022-0493(2007)100[1423:broadc]2.0.co;2 | DOI Listing |
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