ScienceDirect - Biological Control : Seasonal Changes in Habitat Preference by Coleomegilla maculata: Implications for Colorado Potato Beetle Management in Potato

Biological Control
Volume 17, Issue 2, February 2000, Pages 164-173

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doi:10.1006/bcon.1999.0781

Regular Article

Seasonal Changes in Habitat Preference by Coleomegilla maculata: Implications for Colorado Potato Beetle Management in Potato

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

Brian A. Nault ¹ and George G. Kennedy

Department of Entomology, Box 7630, North Carolina State University, Raleigh, North Carolina, 27695

Received 20 April 1999;

accepted 10 August 1999. ;

Available online 26 March 2002.

Abstract

Seasonal abundance, dispersal, and overwintering of the 12-spotted ladybird beetle, Coleomegilla maculata (DeGeer), in the mid-Atlantic states were investigated to assess the potential to manipulate the habitat of this predator to increase its impact on Colorado potato beetle, Leptinotarsa decemlineata (Say), management in commercial potato plantings. C. maculata populations were highest in corn fields through August, and overwintering aggregations were found most commonly in habitats adjacent to these fields. Although adult and larval populations of C. maculata were synchronized with first-generation potato beetle eggs and small larvae, they were concentrated in wheat rather than potato fields because most of the potato plants had not yet emerged when C. maculata adults dispersed from their overwintering sites. The subsequent generation of C. maculata tended to aggregate in corn rather than potato in late May and early June. Therefore, given the current mixture of crops as well as climatic and marketing limitations on planting date for potatoes, the potential for habitat manipulation to increase the impact of C. maculata on Colorado potato beetle management in potato in the mid-Atlantic states appears to be limited.

Author Keywords: Coleomegilla maculata; Leptinotarsa decemlineata; overwintering; dispersal; seasonal abundance.

¹ Present address: Eastern Shore Agricultural Research and Extension Center, Virginia Polytechnic Institute and State University, 33446 Research Drive, Painter, VA 23420.

Biological Control
Volume 17, Issue 2, February 2000, Pages 164-173

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