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Demographic studies of Oomyzus incertus (Hymenoptera: Eulophidae), a larval parasitoid of Hypera postica (Coleoptera: Curculionidae), treated with four organophosphorous insecticides

Published online by Cambridge University Press:  02 April 2012

Qodrat Sabahi  and
Khalil Talebi
Qodrat Sabahi
Affiliation:
Plant Pest and Disease Research Institute, Tehran 1454, Iran
Khalil Talebi*
Affiliation:
Plant Protection Department, Agricultural Faculty, Tehran University, Karaj 31585, Iran
*
1Corresponding author (e-mail: [email protected]).
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Extract

The alfalfa weevil, Hypera postica (Gyllenhal) (Coleoptera: Curculionidae), can severely damage the first cutting of alfalfa, Medicago sativa L. (Fabaceae), in much of Iran. The pest has been parasitized by several parasitoids including Oomyzus incertus (Ratzeburg) (Hymenoptera: Eulophidae), a gregarious larval endoparasitoid. This wasp can parasitize up to 30% of weevil larvae in alfalfa fields in northern Iran. It produces three to four generations per year, and the female prefers the fourth instar of the host for oviposition. Each female lays 2 to 22 eggs per host, which hatch within 47–60 h. The life cycle is completed in about 2 weeks, upon pupation inside the host. This species is predominantly present during the summer months in alfalfa fields (Streams and Fuester 1967).

Type
Articles
Information
The Canadian Entomologist , Volume 137 , Issue 4 , August 2005 , pp. 488 - 491
Copyright
Copyright © Entomological Society of Canada 2005

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