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The biology of Diadromus collaris (Hymenoptera: Ichneumonidae), a pupal parasitoid of Plutella xylostella (Lepidoptera: Plutellidae), and its interactions with Oomyzus sokolowskii (Hymenoptera: Eulophidae)

Published online by Cambridge University Press:  09 March 2007

Shu-sheng Liu ,
Xin-geng Wang ,
Zu-hua Shi  and
F.B. Gebremeskel
Shu-sheng Liu*
Affiliation:
Institute of Applied Entomology, Zhejiang University, 268 Kaixuan Road, Hangzhou 310029, China
Xin-geng Wang
Affiliation:
Institute of Applied Entomology, Zhejiang University, 268 Kaixuan Road, Hangzhou 310029, China
Zu-hua Shi
Affiliation:
Institute of Applied Entomology, Zhejiang University, 268 Kaixuan Road, Hangzhou 310029, China
F.B. Gebremeskel
Affiliation:
Institute of Applied Entomology, Zhejiang University, 268 Kaixuan Road, Hangzhou 310029, China
*
*Fax: 86 571 86049815 E-mail: shshliu@zju.edu.cn
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Abstract

The ichneumonid Diadromus collaris (Gravenhorst) has been recorded in many parts of the world as an important parasitoid of the diamondback moth, Plutella xylostella (Linnaeus), a serious pest of brassica vegetable crops worldwide. Some aspects of its biology and its interactions with Oomyzus sokolowskii(Kurdjumov), another major parasitoid of the same pest, were studied in the laboratory. At 25°C, female wasps did not have mature eggs in their ovaries until about 12 h after emergence. Both males and females mated successfully 24–48 h after emergence, and females started to oviposit one to two days after emergence. Unmated females produced male progeny only; mated females produced progeny of both sexes. The development rate of the parasitoid increased linearly with temperature from 15 to 30°C, with an estimated low temperature threshold of 7.4°C and a thermal constant of 225.1 day-degrees for development from egg to adulthood. Rates of survival from larva to adulthood were about 90% between 20 and 28°C and decreased as temperature decreased or increased. No immatures survived to adulthood at 35°C. When provided with honey solution, the females lived on average 8.3, 11.5 and 7.0 days, and parasitized 26, 44 and 46 host pupae at 20, 25 and 30°C, respectively. Female wasps could be stored at 15°C for up to four weeks without detrimental effects on reproduction. Females of D. collaris attacked host pupae already parasitized by O. sokolowskii, inserting their ovipositor into the hosts at a similar frequency as into unparasitized host pupae, but they did not lay eggs inside the hosts.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 91 , Issue 6 , December 2001 , pp. 461 - 469
Copyright
Copyright © Cambridge University Press 2001

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