Traditionally in Australia, regular applications of insecticide to the floors and lower walls of broiler houses after cleanout periods have been used in an attempt to control lesser mealworm, Alphitobius diaperinus (Panzer). The Australian chicken meat industry has been concerned in recent years with the failure to control A. diaperinus in its broiler houses by using this method and with large beetle populations breaching farm biosecurity. Resistance to fenitrothion was suspected to be responsible for these recent control failures. In response, beetles from 13 poultry facilities were compared with an insecticide-susceptible reference population by using a topical application method. Generally, strong resistance to fenitrothion (up to 79 times that of the susceptible at the LC50) occurred in populations of A. diaperinus in long-established broiler growing areas of southeastern Queensland, where fenitrothion had been used continuously for up to 20 yr. In newly established broiler growing areas, where considerably less fenitrothion had been used (i.e., ≈5 yr), much weaker or no resistance occurred. In addition, dose–mortality data generated for the susceptible reference beetle population over a range of fenitrothion concentrations showed that 0.15% fenitrothion at a LC99.9 level could be used as a convenient topical dose concentration to discriminate between susceptible and resistant individuals. Using this method, the susceptibility of 27 field populations of A. diaperinus was determined. Of this total, 23 populations did not exhibit complete mortality against the discriminating concentration (mortality range 0–98.7%). Application of fenitrothion in Australian broiler houses for control of A. diaperinus has now ceased.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 98 • No. 3