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EFFECTS OF GAMMA RADIATION ON FERTILITY, MATING, AND LONGEVITY OF MALES OF THE ORIENTAL FRUIT MOTH, GRAPHOLITHA MOLESTA (LEPIDOPTERA: TORTRICIDAE)1

Published online by Cambridge University Press:  31 May 2012

John A. George
John A. George
Affiliation:
Researoh Station, Canada Department of Agriculture, Vineland Station, Ontario
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Abstract

Male Grapholitha molesta (Busck) treated with 40 krad of gamma radiation in the late pupal stage reduced egg-hatch by 93.6%, and in the young adult stage by 96.4%, in eggs from untreated virgin females with which they were mated; in addition, hatched larvae failed to complete development. Induced sterility was consistently greater in treated adults as compared with treated pupae. Females in the late pupal stage were sterilized with about 10 krad.

Male longevity decreased in proportion to the radiation dosage above 30 krad when caged at a ratio of 3 ♂: 1 ♀. Longevity of untreated males decreased in proportion to the number of females available for mating.

Radiation levels of 30 krad or more decreased male mating, especially when applied to the pupal stage, in inverse proportion to dosage, as detected by caging males with three times as many females.

The number of matings per untreated male increased with the number of females available up to an average of 3.8 while the number of matings per female averaged approximately 1.6 with from one to three males per female.

Type
Articles
Information
The Canadian Entomologist , Volume 99 , Issue 8 , August 1967 , pp. 850 - 857
Copyright
Copyright © Entomological Society of Canada 1967

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References

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