Oviposition behaviour ofEphedrus cerasicola [Hym.: Aphidiidae] parasitizing different instars of its aphid host |
| |
Authors: | T Hofsvang Eline B Hågvar |
| |
Institution: | (1) Department of Entomology, Norwegian Plant Protection Institute, P.O. Box 70, N-1432, Ås-NLH, Norway;(2) Department of Zoology, Agricultural University of Norway, P.O. Box 46, N-1432 Ås-NLH, Norway |
| |
Abstract: | The parasitoidEphedrus cerasicola Starý oviposited in all 4 nymphal instars and in newly moulted adults ofMyzus persicae (Sulzer). The different host categories were offered with no choice. The duration of an oviposition increased with the age of nymphs, being about 13, 18, 21, 22, and 17 s from 1 st instars to adults, respectively. Observations of number of stabbing attacks prior to oviposition, percent of the encounters not resulting in oviposition, time from first encounter to oviposition, handling time and aphid defensive behaviour also indicated that 1 st instarM. persicae are most easily parasitized. The behaviour ofE. cerasicola in encounters with unparasitized and parasitized hosts, suggested that the parasitoid could discriminate. In encounters with parasitized 1 st to 4th instar aphids,E. cerasicola used only the antennae in 80% of the encounters that resulted in discrimination. |
| |
Keywords: | Ephedrus cerasicola Aphidiidae Myzus persicae oviposition host instar diserimination |
本文献已被 SpringerLink 等数据库收录! |
|