Abstract
The response to radiation of a wild-type strain of Mediterranean fruit fly, Ceratitis capitata (Wiedemann), and different generations of the genetic sexing strain, T:Y(wp+) 30C, isolated at the International Atomic Energy Agency Laboratories, Seibersdorf, Austria, was studied. Sexual competitiveness of males of these strains was compared after each had received from 70 to 105 Gy of radiation. Males of the genetic sexing strain were sterilized at a lower dose of radiation than the wild-type strain. Flight ability in two generations of the genetic sexing strains was negatively correlated with dose of radiation. Flight ability and sexual competitiveness of the wild-type strain was higher than the flight ability and competitiveness of the genetic sexing strain. Sexual competitiveness of irradiated males of the genetic sexing strain was 5-10 x times lower than the wild strain at 105 Gy but indicated some improvement at the 70 Gy dose. Efforts to increase the competitiveness of males of this strain or develop new and more competitive genetic strains are warranted.
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