, Volume 58, Issue 3, pp 319–329 | Cite as

Effect of low temperature on emergence, fecundity, longevity and host-feeding by Trichogramma brassicae



The occurrence of sub-optimal temperatures during development of immature parasitoids can have important consequences on adult fitness. We investigated the impact of different regimes of low temperature on emergence, differential mortality, longevity and fecundity in Trichogramma brassicae Bezdenko (Hymenoptera: Trichogrammatidae). The host-feeding behaviour of adult females was also measured as an indicator of energy reserve at emergence. Acclimation of 30 days at 10 °C or 24 days at 13 °C allowed T. brassicae immatures to develop with a lower mortality than those exposed directly at 5 °C. Longevity and fecundity of females decreased at a lower rate with acclimation at 10 °C suggesting that acclimation at 13 °C may have depleted the energy reserves of individuals more than acclimation at 10 °C. Short photoperiod exposure during the maternal generation had no effect on progeny’s fitness. We found no difference among the treatments in females’ host-feeding behaviours, in differential mortality at emergence, in female’s mobility and in F1 sex ratio.


Acclimation Energy reserve Fitness Host-feeding Temperature Trichogramma brassicae 



We thank Josiane Vaillancourt, Danielle Thibodeau and Julie Frenette for supplying insect material and for technical assistance. This research was supported in part by a scholarship from Anatis Bioprotection Inc.


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Copyright information

© International Organization for Biological Control (IOBC) 2012

Authors and Affiliations

  1. 1.Department of Natural Resource Sciences (Entomology)Macdonald Campus of McGill UniversitySte-Anne-de-BellevueCanada
  2. 2.Horticultural Research and Development CentreAgriculture and Agri-Food CanadaSt-Jean-sur-RichelieuCanada

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