Life history of the pupal parasitoid Diadromus subtilicornis (Gravenhorst) (Hymenoptera: Ichneumonidae) as influenced by temperature, photoperiod, and availability of food and hosts

Tran Tan Viet, Keiji Takasu

Research output: Contribution to journalArticlepeer-review

Abstract

Laboratory experiments were conducted to determine lif ehistor ycharacteristics ef
Diadromus subtilicornis, a pupal parasitoid of diamondback moth, using the two parasitoid strains collected from Morioka and Akashi ,Japan . Developmental time from oviposition to emergence decreased with increasing temperature with either 16L : 8D or 12L : 12D. Longevity of both sexes decreased with increasintg temperature. Females live dlonge rthan males at the same temperatures and photoperiods. Females reared at 25 ℃ with 16L : 8D had no mature eggs at day O. The number of mature eggs per female increased up to 5 by day 5, and then decreased after day 15 although they had no access to hosts ,Tlies ercsults indica ttehat they resorb mature eggs and avert egg maturation when deprived of hosts for a ]ong period. When given hosts and honey solution with l6L : 8D, females lived shorter and produced fewer progeny at 30℃ than either 20℃ or 2S℃ . When given hosts daily only after day 20 or day 3S at 2S℃ with 16L : 8D, females produced fewer progeny than females given hosts daily since adult emergence. Longevity of 35-day host-deprived demales was longer than that of undeprived female sand of 20-day host-depriyed females, indicating extension of longevity due to reproductive suppressioll. Considering the plasticiotfy their Iife history combined with their long lifespans and capacity to attack a few hosts a day for an extended period, D. subtilicornis could be used for prevention of buildup of diamondback moth populations in early summer in Japan.
Original languageEnglish
Pages (from-to)255-264
Number of pages10
JournalEntomological Science
Volume3
Issue number2
DOIs
Publication statusPublished - Apr 1 2000

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