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A multi-approach study to delineate interactions between carabid beetles and soybean aphids.
MedLine Citation:
PMID:  23339789     Owner:  NLM     Status:  In-Data-Review    
In recent years, the soybean aphid, Aphis glycines Matsumura, has become the most important exotic pest of soybean, Glycine max (L.) Merrill, in North America. Given the significant yield losses that are reported, considerable effort has been expended to characterize the natural enemy community associated with this pest. Several indigenous and naturalized predators have been identified as potential biological control agents, and these include carabid beetles, an abundant and important family of aphid predators. The objectives of this study were to assess the incidence of field predation by Pterostichus melanarius (Illiger), the most common carabid species in Québec soybeans, using molecular gut-content analysis, and to quantify its impact on A. glycines populations through laboratory and field cage experiments. Throughout the growing season between 16.8% (during low aphid density) and 33.7% (at times of high aphid density) of P. melanarius tested positive for aphid DNA. Furthermore, although laboratory feeding trials confirmed that P. melanarius prey on A. glycines, short-term field cage experiments failed to demonstrate a significant reduction of A. glycines populations by carabid beetles. These results suggest a relatively weak interaction between P. melanarius and A. glycines when pest densities are high, but the high predation rate when aphid densities are particularly low suggests these natural enemies may function as important early-season predators.
Annabelle Firlej; Josée Doyon; James D Harwood; Jacques Brodeur
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Environmental entomology     Volume:  42     ISSN:  1938-2936     ISO Abbreviation:  Environ. Entomol.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7502320     Medline TA:  Environ Entomol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  89-96     Citation Subset:  IM    
Institut de Recherche en Biologie Végétale, Université de Montréal, 4101 rue Sherbrooke est, Montréal, Québec, H1X 2B2, Canada.
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