ScienceDirect® Home Skip Main Navigation Links
You have guest access to ScienceDirect. Find out more.
My Settings
 Quick Search
 Search tips (Opens new window)
    Clear all fields    
Biological Control
Volume 1, Issue 1, June 1991, Pages 8-15
Result list |  previous  < 141 of 166 >  next 
Font Size: Decrease Font Size  Increase Font Size
 Abstract - selected
Purchase PDF (866 K)

Article Toolbox
Related Articles in ScienceDirect
View More Related Articles
View Record in Scopus
How to Cite or Link Using DOI (Opens New Window)

Copyright © 1991 Published by Elsevier Inc.

Cool-season cover crops in the pecan orchard understory: Effects on coccinellidae (Coleoptera) and pecan aphids (Homoptera: Aphididae)
Purchase the full-text article

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

Robert L. Bugga, 1, James D. Dutchera and Patrick J. McNeillb

a Department of Entomology, University of Georgia, Coastal Plain Experiment Station, P.O. Box 748, Tifton, Georgia 31793-0748, USA

b Agricultural Consultant, Route 1, Box 225, Camilla, Georgia 31730, USA

Received 11 July 1990; 
accepted 6 November 1990. 
Available online 20 December 2004.


In mature pecan orchards under minimal or commercial management, cool-season understory cover crops of hairy vetch, Vicia villosa Roth, and rye, Secale cereale (L.), sustained significantly higher densities of aphidophagous lady beetles than did unmown resident vegetation or mowed grasses and weeds. In cover-cropped understories, mean densities of aphidophagous coccinellids were nearly 6 times greater than in unmown resident vegetation and approximately 87 times greater than in mown grasses and weeds. During late winter and spring, rye harbored abundant bird cherryoat aphid, Rhopalosiphum padi L., whereas hairy vetch sustained pea aphid, Acyrthosiphon pisum (Harris); blue alfalfa aphid, A. kondoi Shinji; and thrips, Frankliniella spp. The following aphidophagous lady beetles were abundant in cover-cropped understories: (1) convergent lady beetle, Hippodamia convergens GuerinMeneville; (2) Olla v-nigrum (Mulsant); and (3) seven-spotted lady beetle, Coccinella septempunctata L. In the orchard under minimal management, there was evidence that the rye/vetch mixture led to enhanced densities of convergent lady beetle in the pecan trees. However, no other effects on coccinellids were seen. There was no evidence of improved biological control of pecan aphids

Author Keywords: Insecta; Aphididae; pecan; Coccinellidae; cover crops

Article Outline

• References

1 Present address: Sustainable Agricultural Research and Education Program, University of California, Davis, CA 95616.

Biological Control
Volume 1, Issue 1, June 1991, Pages 8-15
Result list | previous < 141 of 166 > next 
My Settings
Help (Opens new window)
About ScienceDirect  |  Contact Us  |  Information for Advertisers  |  Terms & Conditions  |  Privacy Policy
Copyright © 2009 Elsevier B.V. All rights reserved. ScienceDirect® is a registered trademark of Elsevier B.V.