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| Content Provider | Springer Nature Link |
|---|---|
| Author | Rochat, J. |
| Copyright Year | 1997 |
| Abstract | A particular feature of aphid-parasitoid systems is the existence of a delay between parasitisation (sting) and the death of the host (i.e. mummification). This biological trait is generally not considered important for population stability, except if the delay is very long, and hence it is ignored in most population dynamics studies. However, many crops have relatively short durations, and these time delays may have important consequences and cannot be ignored in a dynamics model. In this study, we are looking for the key-factors that influence an aphidparasitoid system population dynamics during a cropping cycle.Specifically, a simple model based on ordinary and delay differential equations and including biologically meaningful parameters was developed for aphidparasitoid systems and used to examine: (1) effect of biological characteristics of both the aphid and the parasitoid on their dynamics, (2) the effect of parasitoid augmentation on the dynamics of the system (e.g.: date, number and importance of the releases of parasitoids), and (3) to compare observedAphis gossypii — Lysiphlebus testaceipes dynamics in a cucumber crop to the predictions of the model.Good fits between the model and the field data were obtained and suggest that this model may be a powerful tool for selecting species of parasitoid and strategies for their use in biological control augmentation programs for aphid pest management.Une particularité des systèmes hôte-parasitoïde est l’existence d’un retard entre la piqûre parasitaire et la mort de l’hôte (i.e. momification pour les pucerons). Cet aspect n’est généralement pas considéré comme décisif pour la stabilité des populations, sauf si le retard est très long, et, de ce fait, généralement ignoré dans la plupart des études de dynamique de populations. Cependant, la plupart des cultures ont une durée relativement courte, et ce retard peut avoir des conséquences importantes et ne peut être ignoré dans un modèle de dynamique. Dans cette étude, nous recherchons les facteurs clé qui agissent sur la dynamique des populations d’un système puceron-parasitoide pendant la durée d’une culture.Pour cela, un modèle simple basé sur des équations différentielles à retard, incluant des paramètres biologiques, est établi pour représenter le système puceron-parasitoïde et utilisé: (1) pour examiner l’effet des caractéristiques biologiques du puceron et du parasitoïde, (2) pour examiner celui de différentes stratégies de lâcher de parasitoïdes sur la dynamique des populations, et (3) pour comparer la dynamique du coupleAphis gossypii — Lysiphlebus testaceipes en serre de concombre avec les prédictions du modèle.Le bon ajustement du modèle aux données de terrain suggère que le modèle peut être un outil puissant pour choisir des espèces de parasitoïdes et définir des stratégies de lâcher d’auxiliaires pour les programmes de lutte biologique contre les pucerons. |
| Starting Page | 201 |
| Ending Page | 213 |
| Page Count | 13 |
| File Format | |
| ISSN | 00138959 |
| Journal | BioControl |
| Volume Number | 42 |
| Issue Number | 1-2 |
| 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 | 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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