Control of insecticide resistance in a field population of houseflies,Musca domestica, by releasing susceptible flies |
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Authors: | Chobei Imai |
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Institution: | (1) Osaka City Institute of Public Health and Environmental Sciences, 8-34 Tojo-cho, Tennoji, 543 Osaka, Japan |
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Abstract: | Summary Susceptible houseflies,Musca domestica, were released at a waste disposal site to control insecticide resistance in a field housefly population. In the first experiment,
a total of 163,000 pupae of the susceptible Takatsuki strain were released in October–November 1977. LD50 values to fenitrothion and diazinon decreased to about one-sixth in April 1978, five months after the releases, of those
before the releases. For the second experiment, a susceptible colony was derived by cross and backcross between a white-eyed
substrain of the Takatsuki and a field colony. This susceptible colony consisted of whiteeyed flies with low activity and
normal-eyed flies bearing no or one white eye gene. The results of large cage experiments suggested that the normal-eyed males
of the susceptible colony had half the mating competitiveness of wild males. Approximately 31,000–46,000 susceptible pupae
were used in each of five releases from October to November 1980. The population number of each sex, estimated by a mark-release-recapture
method, increased from 12,000 in late September to 35,000–43,000 in middle November and then decreased to 5,000–8,000 in early
December. The frequency of field-collected males bearing one white eye gene and those bearing one male determining factor,
which were characteristics of the susceptible colony released, increased gradually during the period of releases. The susceptibility
of the field population to fenitrothion and diazinon was examined five times in the period from September to December 1980.
With time, the dosage-mortality regression gradually shifted towards that of the susceptible colony after starting the releases.
LD50 values to fenitrothion and diazinon decreased to about one-sixth and one-fifth, respectively, in June 1981, six months after
the second series of susceptible fly releases, of those before the releases. Ratios of the wild flies to the released fiies
were estimated to be between 4.7∶1 and 9.8∶1 in males and between 3.0∶1 and 3.9∶1 in females by taking the quality of the
released colony and the population parameters of the field houseflies into consideration. Under several assumptions, the manner
of resistant phenotype reduction was discussed, based on the dosage-mortality regressions and the ratios of released flies.
These results showed that the releases of susceptible flies were successful in suppression of insecticide resistance in the
field housefly population. |
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