Entomological Review (2013) 93, 1-8

N.P. Vaghina, S.Ya. Reznik and N.D. Voinovich (2013)
Photoperiodic responses of pupa and adult determining maternal influence on progeny diapause in two species of the genus Trichogramma (Hymenoptera, Trichogrammatidae)
Entomological Review 93 (1), 1-8
Abstract: The adult photoperiodic responses of two Trichogramma species were investigated by exposing adults during 3 days to one of the seven light: dark regimes: L: D = 4: 20, 8: 16, 12: 12, 14: 10, 16: 8, 18: 6, and 20: 4. The preimaginal stages of these individuals developed under short (L: D = 12: 12), long (L: D = 20: 4) or intermediate photoperiods (L: D = 14: 10 and L: D = 16: 8 for Trichogramma principium and T. embryophagum, respectively). The progeny of these females developed under short day L: D = 12: 12 and at two moderately diapause-inducing temperatures (13 and 14°C for T. principium, 14 and 15°C for T. embryophagum). In both Trichogramma species which developed at both temperatures, the percentage of diapausing prepupae was significantly dependent both on the photoperiodic conditions of the preimaginal development of the maternal generation and on the photoperiod which influenced the adult females. The adults showed a typical long-day photoperiodic response with a threshold day length of ca 13 h in T. principium and ca 16 h in T. embryophagum, which practically coincided with the thresholds of the pupal photoperiodic responses of these species revealed in our previous studies. However, the ultra-short photoperiods (L: D = 4: 20 and 8:16) caused a relatively stronger diapause-inducing effect on the progeny when applied to the adult females than when it was applied to the pupae. Thus, in both the Trichogramma species studied, the patterns of photoperiodic responses of pupa and adult were somewhat different although they almost coincided in the "ecologically significant" part of the photoperiodic scale.
Original Russian Text © N.P. Vaghina, S.Ya. Reznik, N.D. Voinovich, 2012, published in Zoologicheskii Zhurnal, 2012, Vol. 91, No. 8, pp. 967-974.
(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:
general biology - morphology - evolution
environment/habitat manipulation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
Trichogramma principium (parasitoid)
Trichogramma embryophagum (parasitoid)