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Biological Control
Volume 13, Issue 2, October 1998, Pages 85-90
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doi:10.1006/bcon.1998.0652    
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Copyright © 1998 Academic Press. All rights reserved.

Regular Article

Searching Behavior ofColeomegilla maculataLarvae Feeding on Colorado Potato Beetle Eggs*1

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This article is not included in your organization's subscription. However, you may be able to access this article under your organization's agreement with Elsevier.

Joseph Munyanezaf1 and John J. Obrycki

Department of Entomology, Iowa State University, Ames, Iowa, 50011–3140, f2


Received 3 March 1998; 
accepted 27 June 1998. ;
Available online 10 April 2002.

Abstract

Coleomegilla maculataDeGeer (Coleoptera:Coccinellidae) fourth instars were placed singly into a searching arena containing either 1 or 4 potato (Solanum tuberosumL.) plants, with a total leaf area (both sides) of approximately 0.20 m2per plant. Prey were approximately 24-h-old eggs ofLeptinotarsa decemlineata(Say) (Coleoptera: Chrysomelidae). Three egg densities were used: 2 egg masses per 4 plants (i.e., 2.5 egg masses/m2of leaf area), 2 egg masses per 1 plant (i.e., 10 egg masses/m2), and 7 egg masses per 1 plant (i.e., 35 egg masses/m2). Predators were observed for 4 h. Time spent in selected behaviors (searching, feeding, resting) and location in the plant canopy during each behavior were recorded. Predators exhibited both extrinsic and area-restricted search behaviors. Predators searched a greater amount of leaf area and for longer time periods at 2.5 egg masses/m2compared to 10 or 35 egg masses/m2. Successful predators consumed approximately 8 eggs during the 4-h period and the handling time was approximately 8 min per egg.C. maculatafourth instars consumed entire eggs when they initiated feeding; subsequent eggs were partially consumed. At 10 and 35 egg masses/m2, predators successfully finding eggs spent more time resting than did predators at 2.5 egg masses/m2.

Author Keywords: Coleomegilla maculata; Leptinotarsa decemlineata;Coccinellidae; predation; searching behavior; extrinsic and area-restricted searching.

*1 C. B. HuffakerP. S. Messanger

f1 1To whom correspondence should be addressed at current address: Department of Entomology, University of Minnesota, St. Paul, MN 55123. Fax: (612) 625–5299.

f2 E-mail: jneza001@maroon.tc.umn.edu


Biological Control
Volume 13, Issue 2, October 1998, Pages 85-90
Result list | previous < 105 of 166 > next 
 
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