Effects of gamma radiation on the Mediterranean flour moth, <Emphasis Type="Italic">Ephestia kuehniella</Emphasis>, eggs and acceptability of irradiated eggs by <Emphasis Type="Italic">Trichogramma cacoeciae</Emphasis> females |
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| Authors: | M Mansour |
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| Institution: | (1) Department of Agriculture, Syrian Atomic Energy Commission (SAEC), P. O. Box 6091, Damascus, Syria |
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| Abstract: | The sensitivity of the Mediterranean flour moth, Ephestia kuehniella, eggs in different stages of development to gamma irradiation was studied and the acceptability of irradiated eggs by Trichogramma cacoeciae females was examined. Eggs ranging in age from 1–24 to 49–72 h were exposed, at 24 h intervals, to gamma radiation dosages
ranging from 25 to 400 Gy and effects of gamma radiation on egg hatch and adult emergence was investigated. In addition, the
developmental rate of immature stages (larvae and pupae), resulting from irradiated eggs, to the adult stage was examined
and the acceptance of irradiated eggs to T. cacoeciae females was evaluated. Results showed that the radio-sensitivity of E. kuehniella eggs decreased with increasing age. Egg hatch in 1–24-h-old eggs was significantly affected at 25 Gy dose and at 75 Gy dose,
no egg hatch was observed. When irradiating 25–48-h-old eggs, however, egg hatch was less than 5% at 100 Gy dose, and eggs
49–72-h-old were more resistant; 50 Gy had no significant effect on egg hatch and 300 Gy did not completely prevent it. Irradiation
also negatively affected survival to the adult stage. When 25–48-h-old eggs were irradiated, survival to the adult stage was
completely prevented at 75 Gy dose and no survival was observed beyond 100 Gy dose in 49–72-h-old eggs. In addition, the rate
of development of immature stages resulting from irradiated eggs was negatively affected. While more than 97% of control moths
emerged within 30 days, this ratio decreased to 53 and 69% in 1–24 and 25–48-h-old eggs exposed to 25 Gy dose. Furthermore,
irradiation positively affected the degree of acceptance of eggs to parasitization; irradiated eggs (≤49-h-old) were more
acceptable to T. cacoeciae than cold-treated ones. |
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