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| Content Provider | Springer Nature Link |
|---|---|
| Author | Gunie, G. Laugé, G. |
| Copyright Year | 1997 |
| Abstract | Trichogramma brassicae Bezdenko (Hym., Trichogrammatidae) is a parasitoid used for controlling the European corn borer,Ostrinia nubilalis Hübner (Lep., Pyralidae). In parts of south-eastern France, the parasitoids may be placed under a shelter when they are in the prepupal stage for diapause termination, before they are released among the crops. High temperatures (31°C–32°C) can occur during this period.Prepupae were exposed to one or two high temperature shocks at 32°C in the laboratory, and the effects of these shocks were then recorded on a number of biological parameters of the parasitoids belonging to the experimental generation Go and to the progeny generation G1.The emergence rate of Go individuals was highly affected, even when the prepupae had been exposed to a single shock. This decreased the number of parasitoids, in addition to reducing the fecundity of the females. The temperature shocks also affected the emergence rate of generation G1. No changes were observed regarding the other parameters (minimum duration of final pupal development, longevity, proportion of females). A temperature shock, even a short-lasting low amplitude one, may thus have strong implications on the efficiency of the parasitoids. Trichogramma brassicae Bezdenko (Hym., Trichogrammatidae) est un parasitoïde utilisé dans la lutte contre la pyrale du maïs,Ostrinia nubilalis Hübner (Lep., Pyralidae). Dans certaines régions du Sud Est de la France, les trichogrammes, souche diapausante, sont mis sous abri au stade prénymphe, avant d’être lâchés dans les cultures. On observe alors des pics de température à 31 °C–32 °C.Un ou deux chocs de température à 32 °C ont été appliqués au laboratoire à l’âge prénymphe et leurs conséquences sur divers paramètres biologiques des parasitoïdes ont été observées (génération traitée G0 et sa descendance génération G1). Le taux d’émergence des individus de la génération G0 a été nettement affecté, même par un seul choc de température. Il en découle une diminution de l’effectif des parasitoïdes, à laquelle s’ajoute une fécondité moindre des femelles. Les chocs de température ont aussi affecté le taux d’émergence de la génération G1. Les autres paramètres (durée minimale de fin de développement, longévité, proportion de femelles), ne semblent pas modifiés. Ainsi un choc de température, même de faible amplitude et de courte durée, peut avoir des répercussions importantes sur l’efficacité des parasitoïdes. |
| Starting Page | 329 |
| Ending Page | 336 |
| Page Count | 8 |
| File Format | |
| ISSN | 00138959 |
| Journal | BioControl |
| Volume Number | 42 |
| Issue Number | 3 |
| e-ISSN | 15738248 |
| Language | French |
| Publisher | Springer Netherlands |
| Publisher Date | 1997-01-01 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | parasitoid high temperature shock biological parameters Entomology Plant Pathology Agriculture Animal Ecology Animal Biochemistry Behavioural Sciences |
| Content Type | Text |
| Resource Type | Article |
| Subject | Plant Science Ecology, Evolution, Behavior and Systematics Agricultural and Biological Sciences |
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