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2012年49 No.6
Effect of host egg age and contact time on the parasitic capacity ofTelenomus remus (Hymenoptera: Scelionidae)
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Key Words： Telenomus remus，Spodoptera exigua，egg age，contact time，parasitism capacity
Abstract： The effects of Spodoptera exigua (Hübner) egg age and duration of host-parasite contact on parasitism rate，progeny emergence rate and sex ratio of Telenomus remus Nixon were evaluated under laboratory conditions of (26 ± 1)℃，RH(70 ± 5)% and photoperiod 12 h∶ 12 h． Parasitism rate，progeny emergence rate and sex ratio of T． remus on 6 h-oldfirst-day eggs of S． exigua after 24 h contact were 56． 97% 89． 11% and 87． 63% ，respectively，compared to 54． 47% ，95． 37% and 88． 72% respectively on 6 h-old second-day eggs． There was no significant difference in parasitism rate andprogeny sex ratio between first-day and second-day eggs，but progeny emergence rate was significant higher on second-day
eggs． These results suggest that 6 h-old second-day eggs of S． exigua are the most suitable hosts for mass production of T．remus，and that 24 h of contact is enough to ensure a high rate of parasitism．