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Title: Gamma Radiation and Cold Treatments for the Disinfestation of the Mediterranean Fruit Fly in California-Grown Oranges and Lemons 
Author: Ohta, AT; Kaneshiro, KY; Kanegawa, KM; Nagamine, LR
Date: 1989-01
Publisher: University of Hawaii Press
Citation: Ohta AT, Kaneshiro KY, Kurihara JS, Kanegawa KM, Nagamine LR. 1989. Gamma radiation and cold treatments for the disinfestation of the Mediterranean fruit fly in California-grown oranges and lemons. Pac Sci 43(1): 17-26.
Abstract: Low-dose gamma radiation and cold treatments were tested for
their effectiveness in the disinfestation of the Mediterranean fruit fly, Ceratitis
capitata, from California-grown navel oranges and Calfame lemons. Cold treatments
were applied for 7, 14, or 21 days to simulate postharvest storage and/or
shipment durations and temperatures (5.5°C for oranges and 11.1°C for lemons).
Low-dose gamma radiation treatments were applied at various dosages, both
independent of and in tandem with cold treatments.
The results of egg hatchability and larval survival studies show that a synergistic
effect is observed when gamma radiation and cold treatments are used in
tandem. The data show that infested navel oranges stored for 14-21 days at
5.5°C required a radiation dose of 0.30 kGy or less to result in very low, or no,
hatch of mature medfly eggs. Furthermore, identical treatment of mature
medfly larvae resulted in no adult eclosion from pupae. Shorter durations of cold
storage, however, require considerably higher dosages to observe similar mortality
rates and may not be desirable as fruit quality may be affected at these
higher do sages .
Calfame lemons require higher dosages than oranges to ob serve similar mortality
rates at the same cold treatment durations due to the higher temperature
11.1°C) at which they are stored. The data show that irradiation at 0.30 kGy with cold storage of 21 days or irradiation at 0.50 kGy with cold storage of 14
days is sufficient to cause nearly total egg mortality.
ISSN: 0030-8870

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