AI Article Synopsis
- Resistance to cyfluthrin insecticide was found in nearly all populations of the lesser mealworm, Alphitobius diaperinus, tested across 11 broiler farms in eastern Australia, particularly in southeastern Queensland where its use was frequent.
- A discriminating concentration of 0.0007% cyfluthrin was utilized from 2001 to 2005 to compare 18 field populations; 11 showed varying degrees of resistance, correlating with the number of previous cyfluthrin applications.
- Despite some populations exhibiting low susceptibility, overall resistance levels have increased over time, raising concerns about the continued application of cyfluthrin for managing lesser mealworm infestations.
Article Abstract
Resistance to cyfluthrin in broiler farm populations of lesser mealworm, Alphitobius diaperinus (Panzer) (Coleoptera: Tenebrionidae), in eastern Australia was suspected to have contributed to recent control failures. In 2000-2001, beetles from 11 broiler farms were tested for resistance by comparing them to an insecticide-susceptible reference population by using topical application. Resistance was detected in almost all beetle populations (up to 22 times the susceptible at the LC50), especially in southeastern Queensland where more cyfluthrin applications had been made. Two from outside southeastern Queensland were found to be susceptible. Dose-mortality data generated from the reference population over a range of cyfluthrin concentrations showed that 0.0007% cyfluthrin at a LC99.9 level could be used as a convenient dose to discriminate between susceptible and resistant populations. Using this discriminating concentration, from 2001 to 2005, the susceptibilities of 18 field populations were determined. Of these, 11 did not exhibit complete mortality at the discriminating concentration (mortality range 2.8-97.7%), and in general, cyfluthrin resistance was directly related to the numbers of cyfluthrin applications. As in the full study, populations outside of southeastern Queensland were found to have lower levels of resistance or were susceptible. One population from an intensively farmed broiler area in southeastern Queensland exhibited low mortality despite having no known exposure to cyfluthrin. Comparisons of LC50 values of three broiler populations and a susceptible population, collected in 2000 and 2001 and recollected in 2004 and 2005 indicated that values from the three broiler populations had increased over this time for all populations. The continued use of cyfluthrin for control of A. diaperinus in eastern Australia is currently under consideration.
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| http://dx.doi.org/10.1603/0022-0493-99.3.908 | DOI Listing |
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