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Spiders in wheat: First quantitative data for North America
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.
biological control agents
Great Plains region
BioControl 2001 Dec., v. 46, no. 4
Journal Articles, USDA Authors, Peer-Reviewed
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