ScienceDirect - Biological Control : Functional Response ofColeomegilla maculata(Coleoptera: Coccinellidae) to Colorado Potato Beetle Eggs (Coleoptera: Chrysomelidae)*1

Biological Control
Volume 8, Issue 3, March 1997, Pages 215-224

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doi:10.1006/bcon.1997.0509

Regular Article

Functional Response ofColeomegilla maculata(Coleoptera: Coccinellidae) to Colorado Potato Beetle Eggs (Coleoptera: Chrysomelidae)^*1

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 Munyaneza and John J. Obrycki

Department of Entomology, Iowa State University, Ames, Iowa, 50011, ^f1

Received 8 November 1996;

accepted 17 January 1997. ;

Available online 19 April 2002.

Abstract

A comparative study of the functional response ofColeomegilla maculataDeGeer (Coleoptera: Coccinellidae) fourth instars was conducted under laboratory, greenhouse, and field conditions. In the laboratory, individual larvae were placed in 9-cm petri dishes for 24 h, with 1, 3, 5, or 7 Colorado potato beetle (Leptinotarsa decemlineata[Say]) (Coleoptera: Chrysomelidae) egg masses. Each egg mass was standardized at 15 eggs. In the greenhouse and field,C. maculatalarvae were provided with an equivalent of 0.5 to 35L. decemlineataegg masses/m²of potato leaf. Fourth instars ofC. maculataexhibited a type II functional response toL. decemlineataeggs under laboratory, greenhouse, and field conditions. Predator search efficiency was inversely related with prey density. The maximum mean attack rate (8.7 eggs) byC. maculatalarvae in the field was about half the mean attack rate in the laboratory (17.6 eggs) and greenhouse (20.1 eggs). The difference in prey density between the laboratory and field seems to have been a major contributing factor in determining the rate of predation, whereas differences in environmental conditions (e.g., temperature and possible alternate food) may explain the differences observed in the predation rate in the greenhouse and field.

Author Keywords: Coleomegilla maculata; Leptinotarsa decemlineata; Solanum tuberosum; Colorado potato beetle; predation; functional response

*1 C. B. Huffaker, Ed.

^f1 E-mail: jneza@iastate.edu

Biological Control
Volume 8, Issue 3, March 1997, Pages 215-224

Result list | previous < 115 of 166 > next

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