ScienceDirect - Biological Control : Effect of Coleus Size and Variegation on Attack Rates, Searching Strategy, and Selected Life History Characteristics of Cryptolaemus montrouzieri (Coleoptera: Coccinellidae)

Biological Control
Volume 18, Issue 3, July 2000, Pages 225-234

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doi:10.1006/bcon.2000.0831

Regular Article

Effect of Coleus Size and Variegation on Attack Rates, Searching Strategy, and Selected Life History Characteristics of Cryptolaemus montrouzieri (Coleoptera: Coccinellidae)

References and further reading may be available for this article. To view references and further reading you must purchase this article.

Juliana F. Garcia ¹ and Robert J. O'Neil

Department of Entomology, Purdue University, West Lafayette, Indiana, 47907-1158

Received 30 June 1999;

accepted 15 February 2000. ;

Available online 26 March 2002.

Abstract

Twenty-four-hour attack rates and the search strategy of third instar Cryptolaemus montrouzieri Mulsant (Coleoptera: Coccinellidae) attacking 1 to 16 third instar Planococcus citri Risso (Homoptera: Pseudococcidae) were measured on green and yellow-variegated Solenostemon scutellarioides (L.) Codd (= Coleus blumei (Bentham)) (Labiatae) plants of different sizes. Selected life history characteristics of C. montrouzieri fed different amounts of P. citri as prey from third instar to adults were also examined. On average, predators attacked 1 to 4 mealybugs, depending on the number of mealybugs and plant size. There was no effect of plant color on attack rates. Attack rates were positively related to prey density, whereas the estimated area searched by predators was inversely related to prey density. Analyses suggest that leaf area was the plant characteristic that most affected attack rates. Predators fed few prey had a decrease in body weight and survival. The implications for the use of C. montrouzieri in biological control are discussed.

Author Keywords: mealybug destroyer; citrus mealybug; tritrophic interactions; functional response; Cryptolaemus montrouzieri; Planococcus citri; Solenostemon scutellarioides; Coleus blumei.

¹ Current address: Department of Entomology, University of California, Riverside, CA 92521.

Biological Control
Volume 18, Issue 3, July 2000, Pages 225-234

Result list | previous < 95 of 166 > next

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