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| Content Provider | Springer Nature Link |
|---|---|
| Author | Christiansen Weniger, P. Hardie, J. |
| Copyright Year | 1997 |
| Abstract | The aphid parasitoid,Aphidius ervi Haliday, overwinters in larval diapause. The possibility that the parasitoid might prefer sexual (oviparae) rather than asexual females (virginoparae) as overwintering hosts (oviparae predominate in autumn when host numbers are generally declining) was tested by comparing these aphid morphs as potential hosts. Two host species were also examined, the pea aphid,Acyrthosiphon pisum (Harris), and the blackberry aphid,Sitobion fragariae (Walker). The parasitoids took longer to develop inS. fragariae than inA. pisum but the development of non-diapausingA. ervi was similar in sexual and asexual females. This observation, together with the greater variation in the duration of the different parasitoid stadia inS. fragariae, indicated that the parasitoid is specialized on the pea aphid.In photophases of 12 h and longer, the proportion ofA. ervi entering diapause inA. pisum oviparae was higher than in virginoparae. The critical daylength (where 50% of parasitoids entered diapause) was therefore longer in oviparae (12.6 h) than in virginoparae (11.7 h) with the inference that parasitoids developing in the oviparae would enter diapause earlier in the field. InS. fragariae, critical day-lengths were similar in both aphid morphs. The duration of diapause was unaffected by host morph and emergence in short days (10:14 L:D) occurred over a long period (c. 60 days).Le parasitoïde de pucerons,Aphidius ervi Haliday, passe l’hiver sous la forme de larves en diapause. La possibilité que le parasitoïde puisse préférer les femelles de forme sexuée (ovipares) à celles de forme asexuée (virginipares) comme hôtes d’hivernation (la forme ovipare prédomine en automne au moment où les effectifs sont en baisse), a été étudiée en comparant ces différentes formes comme hôtes potentiels. Deux espèces hôtes ont aussi été examinées,Acrytosiphon pisum (Harris) etSitobion fragariae (Walker). Les parasitoïdes ont un développement plus long dansS. fragariae que dansA. pisum mais le développement des individus sans diapause d’A. ervi est identique chez les femelles de forme sexuée et chez celles de forme asexuée. Cette observation, ainsi que la variation plus importante de la durée des différents stades du parasitoïde dansS. fragariae, indique que le parasitoïde a pour hôte préférentiel le puceron du pois,A. pisum.Avec des photophases de 12 h et plus, la proportion d’A. ervi entrant en diapause dans la forme ovipare d’A. pisum est plus élevée que dans la forme virginipare. La longueur critique du jour pour laquelle 50 % des parasitoïdes entrent en diapause est donc plus longue dans la forme ovipare (12,6 h) que dans la forme virginipare (11,7 h) avec la conséquence que, au champ, les parasitoïdes se développant dans la forme ovipare entreraient en diapause plus tôt. PourS. fragrariae, les durées critiques de jour sont semblables dans les deux formes du puceron. La durée de la diapause n’était en rien affectée par le morphe de l’hôte et l’émergence en jours courts (photopériode de 10 h) a eu lieu sur une longue póriode (environ 60 jours). |
| Starting Page | 165 |
| Ending Page | 172 |
| Page Count | 8 |
| 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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