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Spiders in wheat: First quantitative data for North America

Permanent URL:
http://handle.nal.usda.gov/10113/2983
File:
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Abstract:
Spiders were sampled quantitatively, by vacuum insect net (D-vac) followed by hand search, in Russian wheat aphid-resistant and -susceptible cultivars of winter wheat in Colorado. Spider densities were unaffected by cultivar, aphid density or wheat tiller density. Compared to other parts of the world, spider densities were one to two orders of magnitude lower, and the fauna more evenly dispersed over families rather than being dominated by the Linyphiidae. Given their very low densities, unmanipulated spider populations may be incapable of exerting significant biological control on cereal aphids in this system. Habitat manipulations such as those that have increased spider populations in wheat in Europe are under investigation.
Author(s):
Greenstone, M.H.
Subject(s):
Araneae , population density , species diversity , Triticum aestivum , winter wheat , cultivars , varietal resistance , Diuraphis noxia , biological control agents , predatory arthropods , natural enemies , Colorado , Great Plains region
Format:
p. 439-454.
Note:
Includes references
Source:
BioControl 2001 Dec., v. 46, no. 4
Language:
English
Year:
2001
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.