Acta Entomologica Sinica (1998) 41, 389-395

Xingeng Wang and Shusheng Liu (1998)
[Bionomics of Diadromus collaris (Hymenoptera: Ichneumonidae), a major pupal parasitoid of Plutella xylostella]
Acta Entomologica Sinica 41 (4), 389-395
Abstract: Diadromus collaris is a major pupal parasitoid of Plutella xylostella in Hangzhou, China. This paper reports the observations of several. aspects of its biology and the effect of several insecticides on its adults. At 25°C, adult females started oviposition on 1~2 d after emergence and reached their oviposition peak on 3~7 d. On average, the total number of pupae parasitized by a mated female was 43.8 and the oviposition period was 11. 5 d. The parasitoid had five larval instars. At 25°C, the development durations for egg and each larval instar were 1~2 d, and 5~6 d for the pupa respectively. The mean development periods from egg to adult at 15°C , 17. 5°C , 20.0°C , 22.5°C , 25.0°C, 27.5°C, 30.0°C and 32.5°C were 30.6, 22.5, 17.8, 14.5, 12.1, 11. 1, 10.3 and 10. 2 d respectively. There was no significant difference in the developmental time between male and female. The temperature threshold and the summation of effective temperature for the development of whole immature stage were 7.4°C and 225.1 day degrees. A temperature range of 17°C to 30°C was favorable for the development, survival and reproduction of the parasitoid. The adults could be stored for 20~30 d at 15°C. Phoxim, methomyl and shachongshuang caused quick and high mortality to the adults, fenvalerate was moderately toxic, Bt, chlorfluazuron and abamectin appeared harmless to the adults.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Xin-Geng Wang, Shu-Sheng Liu

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Plutella xylostella		China (south)
Diadromus collaris (parasitoid)	Plutella xylostella		China (south)