Journal of Economic Entomology (2003) 96, 1724-1731

Stephanie Bloem, James E. Carpenter and J. Hendrik Hofmeyr (2003)
Radiation biology and inherited sterility in false codling moth (Lepidoptera: Tortricidae)
Journal of Economic Entomology 96 (6), 1724-1731
Abstract: False codling moth, Cryptophlebia leucotreta (Meyrick), male and female mature pupae and newly emerged adults were treated with increasing doses of gamma radiation and either inbred or out-crossed with fertile counterparts. For newly emerged adults, there was no significant relationship between dose of radiation and insect fecundity when untreated females were mated to treated males (N-female by T-male). However, fecundity of treated females mated to either untreated (T-female by N-male) or treated males (T-female by T-male) declined as the dose of radiation increased. A similar trend was observed when mature pupae were treated. The dose at which 100% sterility was achieved in treated females mated to untreated males (T-female by N-male) for both adults and pupae was 200 Gy. In contrast, newly emerged adult males treated with 350 Gy still had a residual fertility of 5.2% when mated to untreated females, and newly emerged adult males that were treated as pupae had a residual fertility of 3.3%. Inherited effects resulting from irradiation of parental (P₁) males with selected doses of radiation were recorded for the F₁ generation. Decreased F₁ fecundity and fertility, increased F₁ mortality during development, and a significant shift in the F₁ sex ratio in favor of males was observed when increasing doses of radiation were applied to the P₁ males.
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Database assignments for author(s): James E. Carpenter, J. Hendrik Hofmeyr

Research topic(s) for pests/diseases/weeds:
quarantine treatments/regulations/aspects
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Thaumatotibia leucotreta