Journal of Applied Entomology - Zeitschrift für angewandte Entomologie (1998) 122, 555-559

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S.Ya. Reznik, N.D. Voinovich and T.Ya. Umarova (1998)
Egg retention in the presence of a host in Trichogramma females
Journal of Applied Entomology - Zeitschrift für angewandte Entomologie 122 (9-10), 555-559
Abstract: Laboratory experiments with Trichogramma principium suggest that Trichogramma females may be in one of two alternative states: the parasitization state or the egg retention state. Dissections show that T. principium females at emergence have ~20 mature ovarian eggs. Females in egg retention state have practically the same mean number of mature ovarian eggs, while the distribution is different, suggesting that both oosorption and oogenesis may occur during egg retention. In parasitizing females, additional maturation starts simultaneously with the oviposition. However, ovipositing females tend to lay eggs with maturation, which is why they mostly carry few (< 5) mature ovarian eggs. The mean number of eggs laid during the first 48 h of the oviposition does not depend on whether the parasitization is delayed or not, suggesting that egg retention is connected just with oviposition behaviour rather than with the intensity of oogenesis. We conclude that 'voluntary' egg retention in the presence of a host does not differ with the state of ovaria from 'forced' egg retention under host deprivation. Supposedly, egg retention with the availability of a suitable host may be considered as a sort of short-term adult diapause-like state when not oogenesis, but oviposition is subject to hormonal regulation.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Sergey Ya. Reznik

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation

Pest and/or beneficial records:

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


Trichogramma principium (parasitoid)
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