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| Content Provider | Springer Nature Link |
|---|---|
| Author | Langer, A. Stilmant, D. Verbois, D. Hance, Th. |
| Copyright Year | 1997 |
| Abstract | Activity of antagonists in winter and early spring as well as in late summer and autumn plays an important role in the control of cereal aphid populations. Indeed, parasitoids active early in the year are important to avoid high aphid densities. Late summer and autumn correspond to the transition period between two wheat cultures, and parasitoid activity would thus reduce aphid infestation. During these critical periods, other crops like rye-grass and red clover containing alternative hosts could play the role of parasitoid reservoirs. During 1996, parasitoid activity was measured by trap planting in wheat, rye-grass, red clover and fallow grassland. In each plot, early spring was characterized by an important parasitoid activity, while aphids remained at a low level. Later in spring, activity decreased, and aphid development began even during this period. During the summer, when aphids reached their population peak, parasitoid activity rose again. Percentage of parasitism of aphids sampled was only important during summer in red clover and rye-grass. In wheat and fallow grassland, percentage of parasitism remained at a low level. The role of synchronization between parasitoid activity and aphid development is discussed.Pour être efficace dans le contrôle des populations de pucerons, l’activité des antagonistes ne doit pas seulement être importante durant la bonne saison. En effet, une activité précoce des parasitoïdes est nécessaire pour obtenir un pourcentage de parasitisme élevé en été.Par ailleurs, la fin de l’été et l’automne marquent la transition entre deux cultures de froment successives, et une activité des parasitoïdes pourrait ansi réduire l’infestation des nouveaux champs par les pucerons. Dans le même contexte, les jachères et les friches peuvent héberger des pucerons pouvant servir d’hôte alternatif aux parasitoïdes des pucerons de céréales. Ces zones pourraient donc intervenir en tant que réservoirs de parasitoïdes durant ces périodes critiques.De janvier à août 1996, cette activité des parasitoïdes a été mesurée par des « plantes pièges » dans des champs de froment, de ray-grass, de tèfle ainsi que dans une friche. Partout, l’activité était élevée en début de printemps. Fin mai et début juin, elle a diminué et c’est à ce moment-là que les pucerons se sont développés. Lorsque les populations de pucerons leur maximum en été, l’activité des parasitoïdes reprenaient. Le pourcentage de parasitisme des pucerons récoltés était seulement important dans le trèfle et dans le ray-grass, et ceci en fin d’été. Dans les cultures de froment et dans la friche, le pourcentage demeurait très faible. La synchronisation entre l’activité des parasitoïdes et le dévelopement des pucerons est discutée. |
| Starting Page | 185 |
| Ending Page | 191 |
| Page Count | 7 |
| 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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