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Distribution, host range, and climatic constraints on Centistes gasseni (Hymenoptera: Braconidae), a South American parasitoid of cucumber beetles, Diabrotica spp. (Coleoptera: Chrysomelidae)

Published online by Cambridge University Press:  09 March 2007

G. Cabrera Walsh*
Affiliation:
South American Biological Control Laboratory, USDA/ARS/SABCL, 3130 Buenos Aires PL, Washington 20521-3130, USA
M.M. Athanas
Affiliation:
Agricultural Research Service, Insect Biocontrol Laboratory, Bldg. 011A, Rm. 107, BARC-West, Beltsville, MD 20705, USA
L.A.B. Salles
Affiliation:
Centro de Pesquisa Agropecuária de Clima Temperado, Empresa Brasileira de Pesquisa Agropecuária, Caixa postal 403,96001.970 Pelotas, RS, Brazil
R.F.W. Schroder
Affiliation:
Agricultural Research Service, Insect Biocontrol Laboratory, Bldg. 011A, Rm. 107, BARC-West, Beltsville, MD 20705, USA
*
*Fax: (54) 11 4662 0999 E-mail: [email protected]

Abstract

The genus Diabrotica includes a large number of pest species, including some of the most important crop pests of the Americas. The parasitoid Centistes gasseni Shaw is the first braconid to be described parasitizing Diabrotica in South America, and high natural infestations are reported. Field and experimental observations on the host range, distribution and biology of this parasitoid are described. Centistes gasseni was collected in southern Brazil, eastern Paraguay and northeastern Argentina, in a region comprising humid lowlands and highlands, and cool temperate to warm subtropical climates, with regular rainfall in excess of 1300 mm. Three Diabrotica species, D. limitata (Sahlberg), D. speciosa (Germar) and D. viridula (Fabricius) were found to host the parasitoid, with mean percent parasitism of 5.4, 2.0 and 1.0%, respectively. Diabrotica speciosa and D. viridula are the two most important pest Diabrotica species in South America. Laboratory experiments with field-collected beetles and parasitoid cocoons indicated that C. gasseni overwinters in adult host beetles, remaining dormant in its live host below developmental temperatures. A potential distribution of C. gasseni in North America is proposed based on its known climatic range and the distribution of the main pest species of adult overwintering North American Diabrotica.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2003

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