Instar-specific defense of the pea aphid,Acyrthosiphon pisum: Influence on oviposition success of the parasiteAphelinus asychis (Hymenoptera: Aphelmidae) |
| |
Authors: | D Gerling B D Roitberg M Mackauer |
| |
Institution: | (1) The George S. Wise Faculty of Life Sciences, Tel Aviv University, 69978 Ramat Aviv, Israel;(2) Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, V5A 1S6 Burnaby, B.C., Canada |
| |
Abstract: | The parasite Aphelinus asychisWalker (Hymenoptera: Aphelinidae) oviposits in all four instars of the pea aphid, Acyrthosiphon pisum(Harris) (Homoptera: Aphididae). Searching females display a highly stereotyped sequence of behaviors when encountering a host. Once recognized, an aphid is examined and probed by the wasp with the everted ovipositor prior to oviposition. Oviposition success is influenced by aphid behavior that is related to aphid size and expressed through instarspecific escape and defense reactions. Being smaller and less able to defend themselves, first and early-second instars of pea aphid are more susceptible to successful parasitism than third and fourth instars, in that order. Observed patterns of preference by Aphelinus females for particular aphid species and instars reflect the outcome of behavioral interactions between the hosts and the parasites, rather than preference in the strict sense. |
| |
Keywords: | Acyrthosiphon pisum Aphelinus asychis Aphelinidae behavior defense reactions host selection oviposition parasite pea aphid |
本文献已被 SpringerLink 等数据库收录! |
|