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Published in: BioControl 6/2009

01-12-2009

Functional response of Pteromalus cerealellae (Hymenoptera: Pteromalidae) on the cowpea weevil, Callosbruchus maculatus (Coleoptera: Bruchidae), and interaction between parasitism and cowpea varietal susceptibility

Authors: George N. Mbata, Carlyle C. Brewster

Published in: BioControl | Issue 6/2009

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Abstract

Laboratory studies were carried out to determine the functional response of the parasitoid, Pteromalus cerealellae (Boucek) to cowpea weevil, Callosobruchus maculatus (F.) hosts, and the relationship between parasitism and cowpea variety susceptibility to the weevil. The attack response of P. cerealella to weevil larvae was best described by a type III functional response using an egg limitation model. The mean attack rate (a) of the parasitoid was estimated as 1.7 and the upper limit of the response was 24 weevil larvae per individual parasitoid within a 48-h period. The results also showed that cowpea varieties resistant to weevil infestation supported fewer weevil progeny and facilitated a greater suppression of the weevil by the parasitoid. The parasitoid progeny index, a measure that compares the number of the parasitoid progeny to the number of the beetle progeny was higher in cowpea weevil resistant varieties than in susceptible varieties. Additionally, the presence of P. cerealellae resulted in reduced weight losses of cowpea caused by the weevil infestation in both susceptible and resistant varieties.

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Metadata
Title
Functional response of Pteromalus cerealellae (Hymenoptera: Pteromalidae) on the cowpea weevil, Callosbruchus maculatus (Coleoptera: Bruchidae), and interaction between parasitism and cowpea varietal susceptibility
Authors
George N. Mbata
Carlyle C. Brewster
Publication date
01-12-2009
Publisher
Springer Netherlands
Published in
BioControl / Issue 6/2009
Print ISSN: 1386-6141
Electronic ISSN: 1573-8248
DOI
https://doi.org/10.1007/s10526-009-9228-7

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